Hitachi dp3x schematic
June 2005
(ver n) Training Materials Prepared by: ALVIE RODGERS C.E.T.
HITACHI
PROJECTION
TELEVISION
http://www.hitachiserviceusa.com
2003
MODEL RELEASE
DIGITAL HD READY PTV
Model No Chassis
46W500 DP33W 2
51S700 DP36
57S700 DP36
65S700 DP36
51S500 DP37 3
57S500 DP37 3
65S500 DP37 3
57T500 DP37C
65T500 DP37C
57X500 DP37D
65X500 DP37D
1
Includes built in ATSC/QUAM tuner
2
Includes built in DVD Player
3
Includes built in Photo Card Reader
1,3
1,3
1,3
CONTENTS... 2003 DP-3X Chassis Projection Television Information
Materials Prepared by… Alvie Rodgers C.E.T. (Chamblee, GA.)
DP-3X BLANK PAGE “NOTES”
BLANK PAGE
June 2005
SECTION (1) POWER SUPPLY DIAGRAMS:
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SECTION (2) MICROPROCESSOR INFORMATION:
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SECTION (3) VIDEO CIRCUIT INFORMATION:
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(ver n)
TOPICS PAGE
(Visual Trouble Shooting) Stand By Power S upply Circuit Diagram Explained -------
LEDs
(Visual Trouble Sh ooting) Stand By Po wer Supply Ci rcuit Diagram --------------------
LEDs
(Visual Trouble Shooting) Deflection Power Supply Circuit Diagram Explained -----
LEDs
(Visual Trouble Shooting) Defl ection Power Supply Circuit Diagram -------------------
LEDs
Power Supply Shut Down
Power Supply Shut Down
Protect (Deflection) Hi Volt Shut Down
Prot_CPT and PROT_SW Shut Down
SW +115V Hi Voltage Regulation
SW +115V Hi Voltage Regulation
Microprocessor
Microprocessor
Audio Video Mute
Audio Video Mute
Microprocessor
Microprocessor
Video NTSC
Video NTSC
Component Video
Component Video
Rainforest IC Pulse
Circuit Diagram Explanation
ABL
Circuit Diagram
ABL
Component Sync
Component Sync
ATSC (Digital Tuner)
Input Circuit Diagram
DVI
•
Audio Video Mute
•
Audio Video Mute
DP-3X TABLE OF CONTENTS
Circuit Diagram Expl ained -------------------------------------------Circuit Diagram ---------------------------------------------------------
Circuit Diagram ----------------------------------------Circuit Diagram Expl ained ---------------------------------Circuit Diagram -----------------------------------------------
DATA COMMUNICATION
DATA COMMUNICATION
Circuit Diagram Explanation
Circuit Diagram
NTSC Sync Input
NTSC Sync Input
Circuit Diagram Explained
Circuit Diagram
and
NTSC Continued
and
NTSC Continued
Explanation Explained
---------------------------------------------------------------------------------- 03-09
Circuit Diagram E xplanation ----------------------------------------------------Circuit Diagram ---------------------------------------------------------------------
Block Diagram
---------------------------------------------------------------------------- 03-13
Circuit Diagram Explanation (See Microprocessor Section)
Circuit Diagram (See Microprocessor Section)
----------------------------------------------------------------- 02-08
Circuit Diagram Explained
Circuit Diagram
----------------------------------------------------------- 03-01
Circuit Diagram
------------------------------------------------------------------- 03-08
DP-36 and DP-38 Only
Materials prepared by
Alvie Rodgers C.E.T.
01-01
01-02
01-03
01-04
01-05
01-10
Circuit Di agram and Explanation -------------------
Explanation
Circuit Diagram
------------------------------------------------- 02-06
Circuit Diagram
------------------------------------------------------ 03-03
Circuit Di agram Explanation ----------------------Circuit Diagram
-------------------------------------------------------- 03-07
------------------------------------- 02-01
------------------------------------ 02-05
--------------------------------- 02-09
----------------------------- 02-10
---------------------------------------
-------------------------------------- 03-12
--------
-----------------------
01-11
01-12
01-13
01-14
03-04
03-06
03-10
03-11
02-06
02-07
Continued on Next Page
Table of Contents Page 1 of 3
June 2005
(ver n)
DP-3X TABLE OF CONTENTS
TOPICS PAGE
Materials prepared by
Alvie Rodgers C.E.T.
SECTION (4) AUDIO CIRCUIT INFORMATION:
Audio
•
•
•
•
SECTION (5) DEFLECTION CIRCUIT:
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SECTION (6) DIGITAL CONVERGENCE CIRCUIT INFORMATION:
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•
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SECTION (7) ADJUSTMENT INFORMATION:
Only information that differs for the DP-2X (previous chassis) are included.
•
•
•
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•
•
•
•
•
•
•
•
•
Main Terminal Circuit Diagram Explanation
Audio
Main Terminal Circuit Diagram
Main / Sub Audio
Main / Sub Audio
Horizontal Drive
Horizontal Drive
IH01 Horizontal Drive IC
Sweep Loss
Sweep Loss
Vertical Output
Vertical Output
Pincushion Circuit
Pincushion Circuit
Digital Convergence Interco nn ect
Digital Convergence Interco nn ect
Remote CLU5728TSI
Remote CLU5727TSI
Remote CLU5725TSI
46" Overlay
51" Overlay
57" Overlay
65" Overlay
DCU Crosshatch Phase Settings --------------------------------------------------------------------------------- 07-01
Off-Set for Red and Blue Raster Position
Vertical Size
Horizontal Size
DCU Character Set-Up
DCU Pattern (Sensor Position) Set-Up
Read from ROM Notes -------------------------------------------------------------------------------------------- 07-07
Remote CLU5728TSI
Remote CLU5727TSI
Remote CLU5725TSI
Adjusting Digital Convergence
Magic Focus
Magnet Locations --------------------------------------------------------------------------------------------------- 07-13
Overlay
•
Selection Circuit Diagram Explanation
Selection Circuit Diagram
Circuit Diagram Explanation
Circuit Diagram
Voltages and Waveforms (Also, Not Running Info.)
Detection Circuit Diagram Explanation
Detection Circuit Diagram
Circuit Diagram Explanation
Circuit Diagram
Diagram
Diagram
Dimensions
Dimensions
Dimensions
Dimensions
Adjustment
Adjustment
Error Codes
Dimensions (See Digital Convergence Section)
--------------------------------------------------------------------------------------- 05-09
--------------------------------------------------------------------------------------- 05-10
(Digital Convergence Mode Functions) DP-37
(Digital Convergence Mode Functions) DP-33W
(Digital Convergence Mode Functions) DP-37C and DP-37D
------------------------------------------------------------------------------------------- 06-09
------------------------------------------------------------------------------------------- 06-10
------------------------------------------------------------------------------------------- 06-11
------------------------------------------------------------------------------------------- 06-12
------------------------------------------------------------------------------------------- 07-03
--------------------------------------------------------------------------------------- 07-04
DCU Data Confirmation
and
(Digital Convergence Mode Functions) DP-37
(Digital Convergence Mode Functions) DP-33W
(Digital Convergence Mode Functions) DP-37C and DP-37D
------------------------------------------------------------------------------------------ 07-12
--------------------------------------------------------------------------- 04-02
-------------------------------------------------------------------------------- 05-03
--------------------------------------------------------------------------- 05-06
---------------------------------------------------------------------------------- 05-08
Circuit Diagram Explanation
Circuit Diagram
Adjustment
Using an External Sign al
----------------------------------------------------------- 04-01
--------------------------------------------------- 04-03
------------------------------------------------------------------- 04-04
---------------------------------------------------------------- 05-01
------------------------- 05-04
----------------------------------------------------------- 05-05
------------------------------------------------------------------ 05-07
------------------------------------------- 06-01
---------------------------------------------------------- 06-05
------------------------------------- 06-06
---------------------------------- 06-07
------------------- 06-08
Adjustment
------------------------------------------------------ 07-02
Adjustment
---------------------------------------------------------- 07-06
--------------------------------------------------- 07-11
--------------------------------------- 07-05
------------------------------------- 07-08
---------------------------------- 07-09
------------------- 07-10
--------------------------------------- 06-09 ~06-12
Continued on Next Page
Table of Contents Page 2 of 3
June 2005
Use Contents on the Left Hand Side to Navigate to Topics
as this section can change often.
Or Go to the page after the Section 10 Things You Should
Know Section Divider for an Index.
SECTION (8) MISCELLANEOUS IN FOR MATI O N:
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SECTION (9) DP-33W DVD TROUBLESHOOTING:
•
•
•
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•
•
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•
•
•
DVD PLAYER TROUBLESHOOTING PICTURES:
•
•
•
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•
•
•
•
SECTION (10) THINGS YOUR SHOULD KNOW: ----------------------------------- 10-01
(ver n)
TOPICS PAGE
Signal PWB
Deflection PWB
Power Supply PWB
CRT PWBs
Front Control PWBs
Rear Panel
Rear Panel
Rear Panel
Rear Panel
Rear Panel
No DVD Player Picture ------------------------------------------------------------------------------ 09-01
No DVD Player Analog Audio ---------------------------------------------------------------------- 09-02
No DVD Player Digital Audio ---------------------------------------------------------------------- 09-03
DVD Player Power Supply Check ----------------------------------------------------------------- 09-04
DVD Player Control Check ------------------------------------------------------------------------- 09-05
DVD Player Audio / Video Check ------------------------------------------------------------------ 09-06
DVD Player Interface Block Diagram ------------------------------------------------------------ 09-07
DVD Player Video Signal Diagram ---------------------------------------------------------------- 09-08
DP-33W Microprocessor Data Communication Signal Diagram --------------------------- 09-09
DVD Player Audio Signal Path Signal Diagram ------------------------------------------------ 09-10
DVD Player Front View and Plastic Cover ------------------------------------------------------ 09-11
DVD Player Control Panel Removal and Plastic Cover Removal --------------------------- 09-12
DVD Player Removal and Dropped Down But Still Connected ----------------------------- 09-13
DVD Player Removed and Top View ------------------------------------------------------------- 09-14
DVD Player Top Screws Removal and Ribbon Cables Identified --------------------------- 09-15
Separation DVD Player From Power Supply PWB -------------------------------------------- 09-16
DVD Player Separated From Power Supply PWB --------------------------------------------- 09-17
Power Supply PWB Troubleshooting Layout --------------------------------------------------- 09-18
DP-3X TABLE OF CONTENTS
Drawing
Drawing
DP-36 (Terminal Input) Drawing (S700 Models)
DP-37 (Terminal Input) Drawing (S500 Models)
DP-37C (Terminal Input) Drawing (T500 Models)
DP-37D (Terminal Input) Drawing (X500 Models)
DP-33W (Terminal Input) Drawing (W750 Models)
--------------------------------------------------------------------------------- 08-01
Drawing
---------------------------------------------------------------------------- 08-02
Drawing
---------------------------------------------------------------------------------- 08-04
Drawing
----------------------------------------------------------------------- 08-03
---------------------------------------------------------------------- 08-05
------------------------------------ 08-06
----------------------------------- 08-07
--------------------------------- 08-08
-------------------------------- 08-09
------------------------------- 08-10
Materials prepared by
Alvie Rodgers C.E.T.
Table of Contents Page 3 of 3
DP-3X BLANK PAGE “NOTES”
BLANK PAGE
POWER SUPPLY
INFORMATION
DP-3X
CHASSIS INFORMATION
SECTION 1
DP-3X BLANK PAGE “NOTES”
BLANK PAGE
DP-3X LED (Visual Trouble Detection) CIRCUIT EXPLANATION
STAND BY POWER SUPPLY
This explains the LED used for Visual Trouble Shooting Circuit Diagram explanation:
(See DP-3X LED (Visual Trouble Detection) Diodes for Stand By Power Supply Diagram for details)
1 GREEN
In the DP-3X chassis, there is 1 Green LED in the Stand By power supply.
Use this LED to determine if the set is experiencing a problem.
The LEDs can be used in the following ways.
OFF:
• If the LED is off, then the power supply that is being monitored is unavailable. (Excluding the possibility
that the LED itself is malfunctioning).
• If the LED turns on but then quickly goes off, then the power supply that is being monitored can be sus-
pected.
ON:
• If the LED is on, then the power supply that is being monitored is working normal. (There is the possibility
that the power supply being monitored may in fact be present but low. If after making visual inspection and
all seems OK, but there’s still a problem, be sure to check the accuracy of the power supply in question.
GREEN LED D913.
D913 (Stand By +5V)
• Monitors the
• This is a new IC in the DP-3X chassis. It is a self contained DC-DC converter that provides the Stand
By +5V which keeps the necessary circuits alive when the set is turned off. Such as the Microprocessor,
etc…..
Stand By +5V
output from
U901
pin 1.
PAGE 01-01
DP-3X CHASSIS
L.E.D. (Visual Troubleshooting) for the Stand By Power Supply
(1 Green L.E.D. for visual trouble sensing observation)
U901
Stand By
DC-DC
Converter
L924
9
C919
8
C918
GREEN
L.E.D.
C922
D913
PPS5
10
4 Gnd
5
6
7
Gnd
Gnd
Gnd
D913 illuminates when the Stand By +5V is available.
SBY + 5V
PAGE 01-02
DP-3X LED (Visual Trouble Detection) CIRCUIT EXPLANATION
This explains the LEDs used in t he Def lect ion Power Supply used for Visual Trouble Shooting Circuit Diagram explanation:
(See DP-3X LED (Visual Troubleshooting) for the Deflection Power Supply Diagram for details)
5 LEDS, 4 GREEN AND 1 RED
In the DP-3X chassis, there are 5 total LEDs that can be used for Visual Trouble shooting. 4 Green and 1 Red.
Use these LEDs to determine if the set is experiencing a problem.
The LEDs can be used in the following ways.
OFF:
If the LED is off, then the power supply that is being monitored is unavailable. (Excluding the possibility that the LED itself is malfunctioning). NOTE: If
condition because of it’s current flow explained below.
If the LED turns on but then quickly goes off before the others, then the power supply that is being
monitored can be suspected.
ON:
If the LED is on, then the power supply that is being monitored is working normal. (There is the possibility that the power supply being monitored may in fact be present but low. If after making visual inspection and all seems OK, but there’s still a problem, be sure to check the accuracy of the power supply
in question.
RED LED D912
is used to monitor the Start Up and Run voltage for the Driver IC
D912
lowing voltages.
• Audio SW +30V
• SW +10V
• +220V
• SW+28V
• SW -28V
• SW +115V
The LED
GREEN LEDs D956, D955, D954 and D932.
D956 (Audio +30V)
D955 (SW +5.5V)
D954 (SW +28V)
D932 (SW +115V)
D912
• Monitors the
• Monitors the
D922
• Monitors the SW +28V output from
• Note: Th is LED requires the SW –28V power supply to be functioning to operated. If the LED opens, or
the negative SW –28V is missing, this LED will not illuminate. If the SW –28V is missing, the set will
shut down.
• Monitors the
• This power supply is used for Deflection and High Voltage generation.
is attached to pin 4 of
Audio +30V
SW +5.5V
cathode.
SW +115V
generated by the SW +5.5V regulator
. If the voltage is missing, the LED will not light.
I901
output from
output from
pin 18 and rectifier
T901
pin 15 and rectifier
T901
pin 11 and rectifier
T901
LED opens, then the set will be in shut down
D932
. This IC is used to generate the fol-
I901
cathode.
D919
I905
D922
D925
pin 1 from
cathode.
cathode.
pin 15 and rectifier
T901
PAGE 01-03
DP-3X CHASSIS
L.E.D. (Visual Troubleshooting) for the Main Power Supply
(5 Total L.E.D. for visual trouble sensing observation, 4 Green and 1 Red)
T901
T901
18
17
28V
15
13
-28V
14
E901
E904
E905
D922
C932
C933
C940
D923
C939
L918
L920
D919
C924
C925
1.77A
C934
3
C935
C941
GREEN
L.E.D.
R931
I905
SW+5.5V
Reg
2
5 8
R964
D954
R965
L909
C926
D956
L910
1
6
1.59A
L914
R932
R933
GREEN L.E.D.
D952 D953
9
10
R934
C936
GREEN
L.E.D.
IAA1
Ft. Audio
Out
L919
See Shut
Down Circuit
L915
D955
Right Audio
7
Left Audio
12
2.28A
1.00A
PPS5
8
9
3 Gnd
4 Gnd
5 Gnd
7 Gnd
PPD5
1
2
SW + 5.5V
SW+ 28V
SW+ 28V
+115V D925
T901
11
12
C942
C943
Osc B+
AC
From
Relay
S901
C911
RED L.E.D.
Hot Ground from
pin 9 of T901
Q905
C949
D912
R944 0.39 Ohm
Start Up
R907R906
D911
R918
E907
+115V
Over
Current
R946
D932
Run
16.3V
D907
4
I901
Driver/Output IC
5
R914
1
D910
L923
R952
R953
GREEN L.E.D.
D908
Q901
115V Regulator
0.85A
R913
I904
9
10
3
Gnd
4
Gnd
5
Gnd
6
Gnd
From Pin 8 T901
7.5P/P
4
3
Regulator Photocoupler
I906
2
SW + 115V
SW + 115V
SW + 115V
C946
R940
R941
1
R942
2
D927
PAGE 01-04
DP-3X POWER SUPPLY SHUT DOWN EXPLANATION
GENERIC SHUT DOWN C IRCUITS EXPLAINED:
The following circuits are commonly used in Hitachi product and relate to the drawing on page 01-10:
SW +115V EXCESSIVE CURRENT DETECTION
(See Figure 1)
One very common circuit used in many Hitachi television products is the B+
circuit. In this circuit is a low ohm resistor
series with the SW +115V. The value of this resistor
is
0.39 ohm
voltage drop across the resistor increases. If the voltage drop is sufficient to reduce the voltage on the
base of
Shutdown signal that is directed to the appropriate
circuit indicated on the drawing on page 01-10 as
point
NEGATIVE VOLTAGE LOSS DETECTION
(See Figure 2)
The purpose of the Negative Voltage Loss detection circuit is to
compare the negative voltage with its’ counter part positive voltage. If at any time, the negative voltage drops or disappears, the
circuit will produce a Shutdown signal.
In Figure 2, there are two resistors of equal value, (15K). One to
the positive voltage SW +28V and one to the negative voltage
SW –28V. At their tie point, (neutral point), the voltage is effectually zero (0) volts. If however, the negative voltage is lost, the
neutral point will go positive. This in turn will cause the zener
diode
and on to the appropriate circuit indicated on the drawing on
page 01-10 as point
Note: The LED
nated by the current draw from +28V to the –28V supply.
VOLTAGE TOO HIGH DETECTION
(See Figure 3)
Another circuit used is the
circuit. In the example shown in Figure 3, the
tion
zener diode
R952
the voltage at the divider center point will rise as well
and trigger or fire the zener diode which produces a
Shutdown sig na l through
ate circuit indicated on the drawing on page 01-10 as
point
. When the current demand increases, the
, the transistor will conduct, producing a
Q905
.
(A)
to fire, cre ating a Shutdown Signal through
D952
D954
D931
and
(A)
. If the voltage source rises to o high,
R953
.
Excessive Current Sensing
in
R944
.
(A)
used for visual trouble shooting is illumi-
Voltage Too High Detec-
is connecte d to a voltage divider
and on to the appropri-
D930
SW+115V
D953
C949
Voltage Loss
R964
15K
D931
D930
Detector
SW +28V
R952
R953
R944
0.39
Current Sensor
Q905
Shut-Down Signal
Figure 1
Shut-Down Signal
D954
Figure 2
High Detector
Figure 3
R946
R947
D953
D952
R965
15K
SW -28V
SW +115V
Voltage Too
Shut-Down
Signal
Base
Bias
(Continued on page 6)
PAGE 01-05
DP-3X POWER SUPPLY SHUT DOWN EXPLANATION
VOLTAGE LOSS or SHORT DETECTION
(See Figure 4)
One circuit used is the
Voltage Loss Detection
cuit. This is a very simple circuit that detects a loss
of a particular power supply and supplies a PullDown path for the base of a PNP transistor.
This circuit consist of a diode connected by its
cathode to a positive B+ power supply. Under normal conditions, the diode is reversed biases, which
cir-
Voltage
Loss
Detector
Any Positive
B+ Supply
B+
Q1
keeps the base of Q1 pulled up, forcing it OFF.
However, if there is a short or excessive load on the
B+ line that’s being monitored, the diode in effect
will have a L OW on its cat hode, turning it ON. This
Figure 4
Shut-Down Signal
will allow a current path for the base bias of Q1,
which will turn it ON and generates a Shutdown
Signal.
B+ GENERATION FOR THE MAIN POWER SUPPLY DRIVER IC I901:
Vcc for the Driver IC is first generated by the AC input. This voltage is called Start Up Voltage.
23.3V
. However, it will begin operation at
routed through the main fuse
radiation for radiating back into the AC power line. After passing
AC is routed through the relay
150V DC voltage to be supplied to the power supply switching transformer
However, one leg of the AC is routed to
D911
Zener
tor of
When the power supply begins to operate by turning on and off the internal Switch MOS FET, the Raw 150V DC routed
through
out of pin (2) through four low ohm resistors (
FET turns on, it causes the transformer to saturate building up the magnet field. When the internal Switch MOS FET turns off,
the magnet field collapses and the EMF is coupled over to the secondary windings, as well as the drive windings. The drive
windings at pin (8) produce a run voltage pulse which is rectified by
and now becomes run voltage (
HOT GROUND SIDE SHUT DOWN SENSING CIRCUITS. (Specific to I901).
In addition, there are 4 Hot Ground side Shutdown inputs that are specifically detected by the main power driver IC
These sensors circuits protect
LATCHED SHUT DOWN MONITORS:
1. (OVP)
2. (TSD)
3. (Trigger) Over Load Protection monitors the difference between the Hot Ground and Floating Ground.
RECOVERING SHUT DOWN INPUT:
4. (OCP)
and made available to pin (4) of
I901
is turned On and it begins to operate.
T901
, in on pin 3 (Drain) and out on pin 2 which is the Source. The Sou r ce of the internal Switch MOS FET is routed
Pin 4
is monitored for Over Voltage Protection at pin 4 of
I901
itself is monitored for Excessive Heat. This block is labeled TSD. (Thermal Sensing Device).
Pin 1
monitors the low ohm resistors,
condition caused by monitoring the current through the internal Switch MOS FET, the voltage will rise and pin 1 has an
internal Over Voltage detection op-amp. If this voltage rises enough to trigger this op-amp, the IC will stop producing a
drive signal.
F901
(a 10 Amp fuse), then through the Line filter
S901
23.3V
I901
from excessive current, temperature or over voltage.
12V
on pin (4) of
and AC arrives at the main full wave bridge rectifier
R906
I901
) for
(AC must be removed to recover).
(Driver IC will recover on it’s own when trouble is removed.)
R907
and
I901
as start up voltage. When this volt age reaches 13Vd c, the internal Regu la-
R908, R909, R910 and R911
pin 4.
R908, R909, R910
I901
. When the s et is tu rned on by
L901
(both a 3.9K ohm resistor), filtered by
D907
I901
and
I901
normal pin 4 voltage is
S901
, AC is applied. AC is
L901
to prevent any internal high frequency
filter it passes another filter
D901
T901
pins (1 and 2).
) to hot ground. When the internal Switch MOS
, filtered by
.
R911
C911
. If these resistors have an excessive curren t
L903
. The HOT leg of
where it is converted to Raw
C911
, clamped by a 36V
then routed clamped by
D911
I901
.
(Continued on page 7)
PAGE 01-06
DP-3X POWER SUPPLY SHUT DOWN EXPLANATION
The next explanation discusses the Cold Ground side shut down circuit operation.
This explains the Pow er Supply Shut Down Circuit Diagram:
See DP-3X Power Supply Shut Down Diagram for details
Use this explanation and Diagram in conjunction with the following diagrams;
DP-3X Deflection Protect Power Supply Shut Down Circuit Diagram and
DP-3X PROT_CPT and PROT_SW Shut Down Circuit Diagram.
The Power supply is centered around the Switching Transformer
This power supply creates voltages that are Switched on when the Set is turned on.
1. Audio SW +30V 2. SW +10V
3. +220V 4. SW+28V
5. SW -28V 6. SW +115V
Other supplies are generated from these 6 main voltages.
Q904 Relay Inhibit Activation. (SHUT DOWN) called COMMON ACTION CIRCUIT.
All Shut Down events will cause the main power relay to turn off. This action will stop all secondary power suppli es.
The Low Voltage power supply (S tand-By) continues to operate.
If any of the 23 shut down circuits activate, the base of
High from
prevents
SOME SHUTDOWN CIRCUITS ARE DEFEATED IN STANDBY MODE. (Set Off).
When the set is turned off or in Stand By, 12 of the shut down inputs are not active.
These shut down circuits are d efeated because the SW (Switched) power supplies are turned off in standby. So to prevent
faults triggering of the shutdown circuit, the sensing circuits are turned off also..
Q906
voltage to operated. Emitter voltage is supplied from the
to function. When the set is turned off these switched voltages disappear, so
COLD GROUND SIDE SHUT DOWN INPUTS EXPLAINED
GENERAL INFORMATION
All of the Power Supply Shutdown circuitry can be broken down into the following categories;
PPS4
connector pin 7 called
Q904
from turning off is the shut down signal disappears after shutdown.
Shorted
•
monitored by
Shorted
•
Shorted
•
Shorted
•
Shorted
•
Prot_SW
•
1. SW +2.2V 2. SW +3.3V
3. SW +5V 4. SW +9V
5. SW +9.3V 6. Blue CRT VM 220V excessive current sensing circuit.
Shorted
•
supplies the high for shutdown if any of the shut down circuit attached to its base become low.
Voltage Missing Detection or Short Detection or Negative Voltage Loss Detection
•
Voltage Too High Detection
•
Excessive Current Detection
•
SW+35V
SW+10V
SW+5.5V
220V
SW+6.3V
(6 shut down inputs) This voltage is monitored by
SW+28V
(from voltage divider
D938
.
(from pin 16 of
(from pin 1 of
(from pin 10 of
(from pin 1 of
(from pin 15 of
Power_1
T901
I905
T901
) This voltage is monitored by
I906
T901
(See previous pages for generic circuit details)
Q904
and the main power supply will STOP.
R940
). This voltage is monitored by
) This voltage is monitored by
) This voltage is monitored by
) This voltage is monitored by
SW +6.3V
T901
and the driver IC,
will go High. This turns on
R941
and
off the SW+115V from pin 11 of
D944
SW +10V
and
I901.
Q903
and removes the Power On
Q903
operates as a “latch”. This
T901
D939
.
D940
.
D941
.
Q906
D942
and
D943
D943
line. This voltage must be active for
can no longer operate.
:
.
.
.
Q906
). This voltage is
requires emitter
Q906
(Continued on page 8)
PAGE 01-07
DP-3X POWER SUPPLY SHUT DOWN EXPLANATION
COLD GROUND SIDE SHUT DOWN SENSING CIRCUITS.
Looking at the base of
SHUT DOWN CIRCUITS:
There are a total of 23 individual Shutdown inputs to the Relay Inhibit transistor
will be described later. However, there are some that are routed to the Power Supply from external circuits not shown on the
Power Supply Shut Down circuit diagram.
There are a total of 3 individual Shutdown inputs from the Deflection PWB via
•
ing diode
Vertical Output I601 Excessive Current Detection
1.
-5V Loss Detection
2.
Excessive High Voltage Detection
3.
There is 1 Shutdown input from the
•
QE08
VM Protect,
Power PWB via
sive current on the Red CRT PWB. (See PROT_CPT & PROT_SW Shut Down Circuit Diagram).
There are 6 individual Shutdown input from the
•
•
•
All of the Cold Ground side Shutdown detection circuits can be categorized by the previously described shut down circuits
which were discussed in the Generic Shut Down Circuits Explanation section.
In the following explanation, the Shutdown circuits will be grouped. This will assist the Service Technician with trouble
shooting the Chassis, by understanding these circuits and having the associated circuit routs, the technician can then
and Conquer”
Voltage Loss (or Short) Detection
signal to a (Hi) then throu gh
On the Signal PWB 2 of 3
PROT-SW
Prot_CPT & Prot_SW Shut Down Circuit Diagram)
Shorted SW+2.2V (
•
Shorted SW+3.3V (
•
Shorted SW+5V (
•
Shorted SW+9V monitored by
•
Shorted SW+9.3V monitored by
•
Q904
the shut down events are triggered by the following.
D951
. (See Deflection Protect Power Supply Shut Down Circuit Diagram).
Protect_CPT
on the Red CRT PWB. From the Red CRT PWB to the Green CRT PWB via
Green CRT PWB to Signal PWB via
PPS4
connector pin 6 called
1
of these inputs is from
EGB1
via
pin 2 called
From
PWB via
CRT PWB.
5
of these inputs are monitoring for a shorted B+ line. These circuits are on the Signal PWB 2 of 3. The y moni-
tor the following;
.
All routed through
connector pin 8 called
Gain.Cont
Q554
collector to the
PPS4
connector pin 5. This signal would be low if the +220V draws excessive current on the Blue
1. SW +2.2V from
2. SW +3.3V from
3. SW +9V monitored by
4. SW +9.3V monitored by
5. SW +5V from
(See PROT_CPT & PROT_SW Shut Down Circuit Diagram).
D933
I404
I403
I402
QEA8
on th the Blue CRT PWB. From the Blue CRT PWB to the Green CRT PWB
. From the
PPS4
I404
pin 4.
I403
pin 3 monitored by
D404.
D403.
I402
pin 3 monitored by
All short detections signals active (Lo). Routed to the base of Q906 which inverts the
to the base of
PPS4
pin 5 to
pin 4) monitored by
pin 3) monitored by
pin 3) monitored by
D404
D403
Protect_CPT
Protect_SW
Gain.Cont
PSC
connector pin 2 to the base of
connector pin
Q904,
Common Action Circuit.
D944
R420
D402
D401
(AC must be removed to recover).
Q904
. Many of these are discrete circuits and
Protect_Def
circuit routed through steering diode
PSC
connector pin 3 called
. This signal would be high if the +220V draws exces-
circuit monitored by
. From the Green CRT PWB to Signal PWB via
5
now called
D402.
D401.
on Power PWB. Labeled
Protect_SW
VM Protect
D944.
Q554
which inverts this High to a Low.
. From the Signal PWB to Power
PROT-SW
routed through steer-
D959
. This input is from
ERG1
connector pin 7 called
, from Signal PWB to
PSC
on the Schematic. (See
connector
“Divide
(Continued on page 9)
PAGE 01-08
DP-3X POWER SUPPLY SHUT DOWN EXPLANATION
On the Power PWB
SW –7V Voltage Loss Detectio n
•
lost, the positive
SW –28V Voltage Loss Detection
•
lost, the positive
In the Deflection Circuit
–5V Voltage Loss Detection
•
DK90.
bias
connector pin 6 to
Voltage Too High Detect ion
Action Circuit. (See DP-3X Power Supply Shut-Down Circuit Diagram for details)
On the Power PWB.
SW +115V Voltage Too High Detection
•
Audio Ground
•
tored by
SW +10V Voltage Too High Detection
•
SW +5.5V Voltage Too High Detection
•
From, the Deflection circuit output called Protect_Def.
DH14 High Voltage Too High Sensing Circuit.
•
ing the pulse from the flyback
This high will be routed to pin 6 of
ate a high that will be routed through the
Circuit Diagram for details)
At the same time, the zener diode
•
Horizontal Drive for High Voltage and this IC will shut off, turning off High Voltage drive pulses.
Excessive Current Detection
On the Power PWB.
SW +115V Excessive Current Detection
•
tion/High Voltage Circuit draws too much current,
voltage of
routed to
relay.
In the Deflection Circuit on the Power/Deflection PWB.
Q604 Vertical Circuit Ex cessive Current Se nsing Circuit.
•
tical Output IC. If the IC draws too much current,
voltage of
routed through
erate a high that will be routed through the
Down Circuit Diagram for details)
On the CRT PWB PROT_CPT.
On the RED CRT PWB +220V Excessive Current Detection
•
current, the base voltage of
ERG1
pin 7,
On the BLUE CRT PWB VM+220V Excessive Current Detection
•
too much current, the base voltage of
through
lector goes low. This low is routed to the PPS4
base of Q906 low turning it on causing shut down.
EGB1
+6.3V
will forward bias
+28V
will forward bias
Any abnormality seen in the deflection circuit will generate a high that will be routed through the
D951.
(See DP-3X Deflection Protect Shut-Down Circuit Diagram for details)
All voltage too high detections circuits are active (Hi) and routed to the base of
If the Audio Output IC
D960
and routed through
(See DP-3X Power Supply Shut-Down Circuit Diagram for details)
Q905
to fall turning on this transistor. When this happens, it’s collector will go high. This high will be
D928
causing it to fire. This high will be routed through
Q604
to fall turning on this transistor. When this happens, it’s collector will go high. This high will be
D608
and to pin 6 of
(See PROT_CPT & PROT_SW Shut Down Circuit Diagram).
PSC
pin 8,
pin 3,
PSC
PPS4
pin 2, to the base of
Monitored by
D949
Monitored by
D952
Monitored by
Monitored by
IAA1
D961.
Monitored by
Monitored by
TH01
pin 5. If the voltage at the cathode of
PPD4
to
PPD4
DH14
PPD4
QE08
will fall turning it on. The collector will go high. This high will go through
pin 6 to
D959
QEA8
D949
and routed through
and it will fire causing shut down.
D952
and routed through
and it will fire causing shut down.
DK90
. In this circuit, if the
D931
and routed through
has an internal short, the Audio ground will go positive. This is Moni-
D957
and routed through
D947
and routed through
This circuit monitors the
Protect_Def
connector pin 6 to
will fire and this high will be routed to pin 7 of
Monitored by
Protect_Def
to
PPD4
.
will fall turning it on. The collector will go high. This high will go
Q554
. Any abnormality seen in the deflection circuit will gener-
D951.
Q905
R927
will develop a larger voltage drop. This will cause the base
R629
will develop a larger voltage drop. This will cause the base
. Any abnormality seen in the deflection circuit will gen-
connector pin 6 to
on the Signal PWB. This h igh turns on
pin 5 to the cathode of
D928
and
D930
This circuit monitors the
Monitored by
D950
. In this circuit, if the
D953
. In this circuit, if the
–5V
is lost, the positive
D930
.
D958
.
D948
.
High Voltage
DH15
goes too high, this zener will fire.
(See DP-3X Deflection Protect Shut-Down
and routed through
and to the base of
D951.
(See DP-3X Deflection Protect Shu t-
RE35
Monitored by
D944
causing D945 to fire and pull the
line generated by rectify-
D930.
Q904
+28V
line going to
220V
. If the
REF1
. If the
Q554B and it’s col -
SW –7V
SW –28V
+5V
will forward
Q904,
Common
IH01
. This is the
If the Deflec-
shutting off the
I601
draws too much
VM220V
PPD4
draws
is
is
Ver-
PAGE 01-09
DP-3X MAIN POWER SUPPLY SHUT DOWN DIAGRAM
D938R958
SW +6.3VSW +10V
D939R959
SW +35V
SW +10V
D934
6V
SBY +5V
AC
R957
S901
Q902
Q906
SHORT
DETECTION
D936D935
R954 C951
Active Lo
R956 C952
12
D918
R929
D933
D940R960
SW +5.5V
D942R961
D941
+220V
D943R962
SW +6.3V
D944D945
Prot_SW
D946R963
PPS4
6
5
SW +28V
D959
Protect_CPT
Power On/Off
onoff
Power_1
1
6
7
T901
11
D917
Relay
Driver
D925
C943
C921
Relay
Inhibit
C949
R948
Q904
C950
R927
R944
R951
C947
C948
R947
Q905
R946
D928
D929
Q903
R949
E907
R950
SW+115
L923
R952
R953
D931
23
Point
A
PPD5
9
10
D932
D961 D960
D958 D957
D948 D947
D951
D950 D949
D953 D952
Audio Gnd
SW +10V
SW +5.5V
3
Protect_Def
R937
+6.3V
R939
SW -7V
R965
SW -28V
D954
R964
SW +28V
D930
PAGE 01-10
DP-3X DEFLECTION PROTECT POWER SUPPLY SHUTDOWN DIAGRAM
Any fluctuations in High Voltage will also be
reflected by the 50P output P/P.
By monitoring the 50P (50 Pulse) rises in High Voltage
will be sensed. If High Voltage climbs too high, DH15
will fire and trigger a shut down event.
DH14 will fire and stop High Voltage Horz. Drive
Flyback
RH32 allows ABL fluctuations to manipulate the Trigger
Point of Shut Down as screen brightness varies.
ABL is inverse proportionate to brightness.
This prevents false Shut Down triggering.
ABL
Active
Normal
PPD4
RH32
TH01
3
5
5OP
4
High Voltage
Sensing Circuit
RH23
LH06
DH13
PROTECT _DEF
See Power Supply Shut Down
Circuit Diagram for continuation.
Vertical Output Circuit
I601
10
R629
C604
0.68 Ohm
Q604
R630
C610
Excessive Vertical Current Det.
R631
D608
6
28V
R632
29.01V
RH24
1
RH25
Hi Volt
H. Drive
IH01
OVP
H. Drive
DH15
Excessive Hi
Voltage Det.
DK90 Monitors the -5V and +5V lines going to the DCU.
If the -5V line is loss, the +5V line provides the Shut Down Hi.
CH17
Stops H. Drive
7
CH10 RH09
RK98
DH14
RH26
+5V
DK90
CK90
RK97
-5V Loss Det.
-5V
If the Vertical Output IC has a problem, R629
will sense the current rise. The voltage drop will
be reflected at the base of Q604 turning it on
and producing a Shut Down high.
PAGE 01-11
DP-3X PROT_CPT and PROT_SW SHUT DOWN DIAGRAM
PROT_CPT SHUT DOWN DIAGRAM
+220V
VM 220V
PDC1
CE10
W8A1
REF2
1
2
QEA8
RE35
2.2 Ohm
QE08
RE29
REF1
15 Ohm
REE9
RED CRT PWB
RGB Drives
VM Circuit
RE31
PROT_SW SHUT DOWN DIAGRAM
BLUE CRT PWB
VM Circuit
REF5
CEC1
RE34
VM
PROT
REF6
CONT
GAIN
RED
CRT
PWB
ERG1
7
BLUE
CRT
PWB
EGB1
8
VM
PROT
GAIN
CONT
GREEN
CRT
PWB
PSC
3
GREEN
CRT
PWB
PSC
2
VM
PROT
GAIN
CONT
SIGNAL
PWB
PSC
3
SIGNAL
PWB
PSC
2
SIGNAL
CPT
PROT
SIGNAL
GAIN
CONT
PWB
PPS4
Active
Hi
6
PROT
CPT
PWB
PPS4
Active
Lo
5 5
PROT
SW
POWER
PWB
PPS4
6
POWER
PWB
PPS4
D421~D424
SW +5.5V
SW +9V
SW +9.3V
SW +2.2V Reg
I404
5
SW +3.3V Reg
I403
1
SW +5V Reg
I402
SIGNAL PWB 2 of 3
4
3
32
SW +2.2V
SW +3.3V
SW +5V
D402
D401
D404
D403
C592
R5T4
RL50
Q554
R420
PAGE 01-12
DP-3X SW +115V POWER SUPPLY REGULATION EXPLANATION
Hi-Voltage Power Supply Circuit Diagram explanation:
(See Power Supply SW+115V Regulation Circuit Diagram for details)
THIS POWER SUPPLY RU NS ONLY WHEN THE SET IS TURNED ON:
TURNING ON THE SW +115V POWER SUPPLY:
When the Set is turned on, the Microprocessor
Power On command is ro uted through
the base of
collector will go low. This will supply a ground path for the power on Relay
energized, AC is supplied to the Bridge rectifier
develops raw 150V which is routed through
D901
the primary coil inside
FET. The Ground return path for the primary voltage is out pin 2 of
Switch MOS FET and then through four 0.22 ohm resistors
See SW+115V Regulation Circuit Diagram for details.
SW +115 REGULATION
SW +115V pulse is generated from pin 11 of
routed thro ugh the Excessive Current sensing circui t
The primary route for the
to the Deflection circuit and High Voltage generation circuit.
However, the regulation route is through
variable resistor whose resistance is dependant upon the
resistor manipulates the current flow from pin 2 to pin 3 ground. This will cause the voltage at pin 2 of
manipulated. Internally, the LED is illuminated by degrees dependant upon the
The internal receiver receives this light and acts as a variable resistor from pin 4 to pin 3 which is the regulation
control signal.
This action causes pin 1 of
quency of the drive pulse delivered to the Gate of the internal SMOSFET (Switch Metal Oxide Semiconductor
Field Effect Transistor) to manipulate the frequency of the pulse generated on the primary of
drain of the internal SMOSFET is monitored by four low ohm resistors mentioned above. If this current exceeds
a specific value, the voltage developed by these low ohm resistors is routed through
is the Over Current Protection circuit as well as the Regulation Control pin. This pin will inhibit the drive signal
to the gate of the SMOSFET. As soon as the excessive current situation is eliminated, the IC will recover and
continue func ti o ni n g.
B+ GENERATION FOR THE POWER SUPPLY DR IVER IC:
Vcc for the Driver IC is first generated by the AC input. This voltage is called Start Up Voltage.
DC to operate normal. However, it will begin operation at
23.3V
When AC is applied to the main full wave bridge rectifier
to be supplied to the power supply switching transformer
However, one leg of the AC is routed to a half wave filter consisting of
tor), filtered by
When this voltage reaches 12Vdc, the internal Regulator of
When the power supply begins to operate by turning on and off the internal Switch MOS FET, the Raw 150V DC
routed through
MOS FET is routed out of pin (2) through four low ohm resi stors to hot gro und. When the internal Switch MOS
FET turns on, it causes the transformer to saturate building up the magnet field. When the internal Switch MOS
FET turns off, the magnet field collapses and the EMF is coupled over to the secondary windings, as well as the
drive windings. The drive windings at pin (8) produce a run voltage pulse which is rectified by
then clamped by
C911
The RED LED
provided the Shut Down sensor
Q902
and out pins 5 and 6 to pin 3 of
T901
SW +115V
I901
, clamped by a 36V Zener
C911
, in on pin 1 (Drain) and out on pin 2 which is the Source. The Source of the internal Switch
T901
and now becomes run voltage (
D911
can be used to determine if the B+ to pin 4 of
D912
Q027
is through
E906
to manipulate the internal oscillator within
Outputs a Power On/Off 1 high command via pin 59. This
I001
and
Q028
Q904
D901
F903
. This pulse is rectified by
T901
E907, L923
to pin 1 of
D911
to the
isn’t activated. When the base of
.
to Pins 1 and 2 of
R908, R909, R910
and
R944
I904
SW +115V
D901
T901
and made available to pin 4 of
I901
connector pin 7. This High will be passed to
PPS4
S901
. This voltage is routed through
T901
which is the Drain of the internal Switch MOS
I901
which is the Source of the internal
I901
and
D925
.
Q905
to pin 9 and 10 of
. Internally, the regulator transistor works as a
voltage fluctuations. The internal variable
12V DC
where it is converted to Raw 150V DC voltage
pin 1 and 2.
R906
is turned On and begins operation.
) for
23.3V
I901
I901
PPD5
SW +115V
. This in turn causes the fre-
I901
on pin 4 of
and
R907
pin 4.
is present.
goes high, it’s
Q902
turning it on. When the relay is
.
R911
, filtered by
and output as
voltage fluctuations .
T901
back into pin 1 which
R912
.
I901
(both a 3.9K ohm resis-
as start up voltage.
I901
and then
C943
SW +115V
I903
. The current
requires
I901
, filtered by
D907
to be
PAGE 01-13
DP-3X CHASSIS POWER SUPPLY SW +115V REGULATION
T901
8
7.5P/P
9
1 of 3
C911 R918
AC for D902
Supplied from
Relay S901
From Bridge D902
150V
F903
AC
From Relay S901
D911
D912
RED L.E.D.
167V
T901
1
2
5A
5
6
High Voltage Power Supply
R913
R906
23.3V
4
I901
Driver/
Output IC
3 2
DS
5
R907
OCP
Start Up
Osc B+
1
R912
R908
R909
R910
R911
0.22
Ohm
11.6V
E906
0.5K
Run
D907
R914
C914
D908
Q901
R916
D910
B+ 115V
D927
23.3V
13.6V
R919
C946
FB
I903
4
3
Regulator
Photocoupler
Hot Ground from
pin 9 of T901
I904
1 2
3
SW + 115V
R940
R941
12.1V
1
R942
2
11.2V
11.2V
R943
D926
C944
T901
11
12
3 of 3
C942
D925
C943
2 of 3
C949
Q905
X-Ray
Protect
R944
0.39 Ohm
D928
D929
D930
R946
R942
D931
3K
E907
R952
R953
L923
Deflection
B+ 115V
D932
PPD5
0.86A
9
10
Cold Ground from
pin 12 of T901
C905
SW +115V
SW +115V
PAGE 01-14
MICROPROCESSOR
INFORMATION
DP-3X
CHASSIS INFORMATION
SECTION 2
DP-3X BLANK PAGE “NOTES”
BLANK PAGE
DP-3X MICROPROCESSOR DATA COMMUNICATIONS CIRCUIT EXPLANATION
Microprocessor Data Communications circuit diagram.
(See DP-3X Microprocessor Data Communications Circuit Diagram for Details)
The Microprocessor must keep in communication with the Chassis to maintain control over the individual circuits. Some of the circuits must return information as well so the Microprocessor will know how to respond to
different request.
The Microprocessor uses two types of communication for control, I
lines . The I
2
C communication scheme only requires 2 lines for control. These lines are called SDA and SCL.
Serial Data and Serial Clock respectively.
Also, due to the fact that this Microprocessor operates at 3.3Vdc, it requires a Level Shift IC to bring the DC
level of the control lines up to make it compatible with the connected components. The Level Shift IC also brings
the DC levels down as outside circuits communicate with the microprocessor.
The Microprocessor communicates with the following ICs:
ON THE SIGNAL PWB:
•
UD2003 Digital Module
•
U301 Main Tuner
•
U302 PinP Tuner
•
I003 EEPROM
•
U401 Flex Converter
•
I010 Level Shift
•
I501 Rainforest
•
IA01 Audio Control
(ATSC Tuner DP-36 and DP-38 Chassis Only)
ON THE TERMINAL PWB:
•
IY01 3D Y/C
•
IV01 A/V Selector
•
IV11 Digital to Analog Converter DAC
•
IV03 Y Pr/Pb Selector
•
IY04 Main Video Chroma Y Pr/Pb Selector
•
IY03 Sub Video Chroma Y Pr/Pb Selector
The following explanation will deal with the communication paths used between the Microprocessor and the respected ICs.
ON THE SIGNAL PWB:
UD2003 Digital Tuner (ATSC Tuner)
DP-36 and DP-38 Chassis Only
The Microprocessor controls the Digital Tuner via communication lines. They are listed below;
•
•
•
DM RTS
DM CTS
DM TXD
(Digital Module Receive Transmission) from pin 9 of
(Digital Module Serial Clock) bi-directional pin 20 of
(Digital Module Transmission Data) bi-directional pin 35 of
tor.
•
•
DM RXD
Power 2
of the
11
(Digital Module Receive Data) bi-directional pin 36 of
(Turns on Digital Module separate from the main Power On line) from pin 58 of
connector. The Table below shows the relationship between Power_1 and Power_2.
PMS1
2
C Bus and the Serial Data, Clock and Load
connector to pin 27 of the
PMS1
pin 7 of the
I001
to pin 5 of the
I001
pin 6 of the
I001
PMS1
PMS1
connector.
PMS1
I001
connec-
connector.
to pin
I001
.
MODE Power _1 Power _2
Stand By Lo Lo
Timer Lo Hi
TV On Hi Hi
When the Timer is set for an unattended Recording,
the Set turns on the Tuner and allows the "Video
Out (Monitor out) to become active so that a recording can be made without turning on the entire
set.
(Continued on page 2)
PAGE 02-01
DP-3X MICROPROCESSOR DATA COMMUNICATIONS CIRCUIT EXPLANATION
U301 Main Tuner (with MTS outputs).
The Microprocessor controls the Main Tuner by SDA2 (Data) and SCL2 (Clock) I
SCL2 and SDA2 lines for the Main Tuner are output from the Microprocessor at pins (
2
C communication lines.
31 SDA2 and 28 SCL2
)
respectively. These lines go directly to the Main Tuner, SDA2 at pin (5) and SCL2 at pin (4). These lines control
band switching, programmable divider set-up information, pulse swallow tuning selection, etc...
U302 PinP Tuner (monaural only).
The Microprocessor controls the Sub Tuner by SDA2 (Data) and SCL2 (Clock) I
SCL2 and SDA2 lines for the Main Tuner are output from the Microprocessor at pins (
2
C communication lines.
31 SDA2 and 28 SCL2
)
respectively. These lines go directly to the Main Tuner, SDA2 at pin (5) and SCL2 at pin (4). These lines control
band switching, programmable divider set-up information, pulse swallow tuning selection, etc...
I003 EEPROM
The EEPROM is ROM for many different functions of the Microprocessor. Channel Scan or Memory List, Customer set ups for Video, Audio, Surround etc… are memorized as well. Also, some of the Microprocessors internal sub routines have variables that are stored in the EEPROM, such as the window for Closed Caption detection.
Data and Clock lines are
pin (29) of the Microprocessor to pin (6) of the
from pin (30) of the Microprocessor to pin (5) of the
SDA1
EEPROM
. Data travels in both directions on the Data line.
EEPROM
and
SCL1
from
Note: In this chassis, if the EEPROM is removed or defective, the Microprocessor will LOCK the picture. No
functions other that the front Power Button will work. LOCK will appear on the screen, but the customer’s menu
can not be accessed.
U401 Flex Converter FC04
The projection television is capable of displaying NTSC as well as ATSC (SDTV) and HD (High Definition).
The Flex Converter is responsible for receiving any video input and converting it to 33.75 Khz output (2.14H).
This output is controlled by sync and by the customer’s menu and how it is set up. The set up can be 4X3 with
grey side panels, Smooth Wide, Fill or Full and even 4X3 with Black Side panels. 16X9 for SDTV. This set will
automatically bypasses the Flex Converter completely and inputs the 1080i signal directly to the Rainforest IC
I501. This happens when a true 1080i signal or Antenna C is selected. The Flex Converter can take any NTSC, SIn, Component, NTSC or any of the 18 formats of ATSC except 1080i which doesn’t route through the Flex converter. Control for the Flex Converter is Clock, Data and Enable lines. The
be routed through the Level Shift IC
to be brought up to 5V.
I007
Clock, Data and Enable
lines must
• The Clock line for the Flex Converter is output from the Microprocessor at pin (
at pins (
I007
2 Clock
• The Data line for the Flex Converter is output from the Microprocessor at pin (
at pins (
I007
4 Data
) and is output at pins (18) then through the
) and is output at pins (16) then through the
connector pin 10
PFC1
connector pin 11
PFC1
52 Data
• The Enable line for the Flex Converter is output from the Microprocessor at pin (
input to
I007
at pins (
6 Enable
) and is output at pins (14) then through the
PFC1
53 Clock
54 FCENABLE
connector pin 12.
). Clock is input to
). Data is input to
). Enable is
Data from the Flex Converter is also sent back to the Microprocessor. Data from the Flex is sent out of the
connector pin 11 to pin 5 of
sor
I001
.
, level shifted down to 3.3V and output at pin 15 into pin 51 of the Microproces-
I007
PFC1
I007 Level Shift
The Microprocessor operates at 3.3Vdc. Most of the Circuits controlled by the Microprocessor operate at 5Vdc.
The Level Shift IC steps up the DC voltage to accommodate.
• Pin 18 outputs a Clock signal, used by the Flex Converter
• Pin 14 outputs an Enable signal, used by the Flex Converter
• Pin 16 outputs a Data signal, used by the Flex Converter.
• Pin 15 outputs 3.3V Data, sent from the Flex Converter
(Continued on page 3)
PAGE 02-02
DP-3X MICROPROCESSOR DATA COMMUNICATIONS CIRCUIT EXPLANATION
I501 Rainforest (Video/Chroma Processor)
The Video Processing IC (Rainforest) is responsible for controlling video/chroma processing before the signal is
made available to the CRTs. Some of the emphasis circuits are controlled by the customer’s menu. As well as
some of them being controlled by AI, (Artificial Intelligence).
Communication from the Microprocessor
and 30) respectively.
IA01 BBE Audio Control (Surround)
This chassis utilizes BBE Surround.
Communication from the Microprocessor via pins (
) respectively.
14
ON THE TERMINAL PWB:
(Through the connector PST2)
IY01 3D Y/C
(IC mounted directly on the Terminal PWB).
The 3D Y/C IC is a Luminance/Chrominance separator, as well as a 3D adder. Separation takes place digitally.
Using advanced separation technology, this circuit separates using multiple lines and doesn’t produce dot pattern
interference or dot crawl. The 3D effect is a process of adding additional emphasis signals to the Luminance and
Chrominance. These signals relate specifically to transitions. Transitions are the point where the signal goes from
dark to light or vice versa. The 3D adds a little more black before the transition goes to white and a little more
white just before it gets to white. It also adds a little more white just before it goes dark and a little more dark just
before it arrives. This gives the impression that the signal pops out of the screen or a 3D effect.
The Microprocessor communicates with the 3D Y/C IC via I
from the Microprocessor are pins (
pins (47 and 46) respectively.
IY01
40 SDA3
The Microprocessor also is able to turn on and off circuits within the 3D Y/C circuit determined by customer
menu set-up.
IV01 A/V Selector
The A/V Selector IC is responsible for selecting the input source for the Main Picture as well as the source for
the PinP or Sub picture. Communication from the Microprocessor via pins (
connector pins (13 and 12) respectively then to
IV11 DAC (Digital to Analog Converter)
This IC works controlling different switches via the DAC0, DAC1 and DAC2 control lines.
•
•
pin 7 controls the V. Sync selector
DAC0
DVI 1/2 via pin 9.
IV06
pin 6 controls the Y selector
DAC1
Media Card via pin 10.
•
pin 5 controls the V. Sync selector
DAC2
Sync selector
for the DVI 1/2/Media Card via pin 11.
IV06
Communication from the Microprocessor via pins (
to
pins (14 and 15) respectively.
IV11
IV03 Main/PinP Y Pr/Pb Selector
Any input that is in the Y Pr/Pb or Y Cr/Cb state, will have be selected by this IC. Both for the Main Picture and
the PinP (Sub) picture.
The Main/PinP Y Pr/Pb Selector IC selects the appropriate input between Components 1 or 2, DVI 1 or 2, ATSC
Tuner and/or DVD Player, if provided. Communication from the Microprocessor via pins (
) to connector
SCL2
pins (15 and 14) to
PST2
I001
and
via pins (
31 SDA2
31 SDA2
and
and
28 SCL2
2
C bus data and clock. The communications ports
39 SCL3
IV01
IV07
IV03
) to connector
pins (34 and 33) respectively.
for DVI 1/2 input via pin 9 and H Sync selector
IV07
for DVI 1/2 input via pin 10 and Y selector
for DVI 1/2/Media Card input via pin 11 and V.
IV07
31 SDA2
and
28 SCL2
pins (26 and 27) respectively.
28 SCL2
) to the Rainforest IC pins (28
) to the Audio Control IC pins (13 and
pins (17 and 16) to the 3D Y/C
PST2
30 SDA1
and
) to connector
29 SCL1
PST2
31 SDA2
) to the
for the
IV06
pins (15 and 14)
and
28
PST2
(Continued on page 4)
PAGE 02-03
DP-3X MICROPROCESSOR DATA COMMUNICATIONS CIRCUIT EXPLANATION
IY04 Main Video Chroma Y Pr/Pb Switch IC
This IC is responsible for selecting the Main picture source. It will be either Composite NTSC Y and C or component Y Pr/Pb or Y Cr/Cb dependant upon the customer’s selection.
• This IC processes the NTSC Luminance (Y) and Chroma (C) from the 3D Y/C circuit for the main picture if
this is the selection. It receives the Y (pin 4) and C (pin 19) and prepares it for the Flex Converter by outputting it as Y (pin 24) Cr (pin 22) / Cb (pin 23) NTSC Only 480i component to the Flex Converter .
• This IC selects the Y (pin 30) Pr or Cr (pin 28) / Pb or Cb (pin 29) if this is the selection by the customer and
outputs it as Y (pin 24) Pr or Cr (pin 22) / Pb or Cb (pin 23) to the Flex Converter. If the output is 1080i, it’s
routed directly to the Rainforest IC I501.
Communication from the Microprocessor via pins (
then to
Note: Y Pr/Pb indicates either 31.5Khz or 33.75Khz and Y Cr/Cb indicates 15.734KHz
IY03 Sub Video Chroma Y Pr/Pb Switch IC
This IC is responsible for selecting the PinP (Sub) picture source. It will be either Composite NTSC Y and C or
component Y Pr/Pb or Y Cr/Cb dependant upon the customer’s selection.
• This IC processes the NTSC Luminance (Y) and Chroma (C) from the 3D Y/C circuit for the main picture if
this is the selection. It receives the Y (pin 4) and C (pin 19) and prepares it for the Flex Converter by output-
ting it as Y (pin 24) Cr (pin 22) / Cb (pin 23) NTSC Only 480i component to the Flex Converter .
• This IC selects the Y (pin 30) Pr or Cr (pin 28) / Pb or Cb (pin 29) if this is the selection by the customer and
outputs it as Y (pin 24) Pr or Cr (pin 22) / Pb or Cb (pin 23) to the Flex Converter. If the output is 1080i, it’s
routed directly to the Rainforest IC I501.
Communication from the Microprocessor via pins (
then to
Note: Y Pr/Pb indicates either 31.5Khz or 33.75Khz and Y Cr/Cb indicates 15.734KHz
pins (13 and 14) respectively.
IY04
pins (13 and 14) respectively.
IY03
31 SDA2
31 SDA2
and
and
28 SCL2
28 SCL2
) to connector
) to connector
pins (15 and 14)
PST2
pins (15 and 14)
PST2
PAGE 02-04
SDA3
SCL3
40
39
DP-3X Chassis Microprocessor Data Communications
PST2
SDA3
SCL3
47
46
IY01
3D-Y/C
17
16
Terminal PWB
IOO1
Micro
PAGE 02-05
Data / Key Out 2
Clock / Key Out 1
SDA1
SCL1
SDA2
SCL2
DM RTS
DM CTS
DM TXD
DM RXD
POWER 2
FCData
FCEnable
Audio Control
Rainforest
Sweep Cont.
30
29
31
28
PMS1
27
20 7
35 6
36 5
58
51
52 4
54
53
IA01
I501
9
11
15
2
DM RTS
DM CTS
DM TXD
DM RXD
POWER 2
I010
Level Shift
14
13
28
30
UD2003
Digital Module
ATSC Tuner
5
16
146
18
SDA2
SCL2
SDA1
SCL1
SDA2
SCL2
SDA1
SCL1
PFC1
FCData
11
12
FC Enable
10
FC Clock
12
15
14
SDA1
SCL1
SDA2
SCL2
3413
33
5
6
5
4
4
5
U401
SDA1
IV01
A/V Select
SCL1
SDA1
IOO3
EEPROM
SCL1
SDA2
SCL2
SCL2
SDA2
FC04
FLEX
&
PinP
U301
Tuner
Main
U302
Tuner
PinP
Main/PinP
IV11
DAC
14 15
IV03
Y Pr/Pb
SELECTOR
26 27
IY04 Main
Video/Chroma
Y Pr/Pb SW
13 14
SIGNAL PWB
MODE Power _1 Power _2
Stand B y Lo Lo
Timer Lo Hi
TV On Hi Hi
When the Timer is set for an unattended
Recording, the Set turns on the Tuner and
allows the "Video Out (Monitor out) to
become active so that a recording can be
made without turning on the entire set.
IY03 Sub
Video/Chroma
Y Pr/Pb SW
13 14
DP-3X AUDIO VIDEO MUTE CIRCUIT EXPLANATION
(See DP-3X Series Chassis Audio Video Mute Circuit Diagram for details)
There are times in which the main picture and audio must be muted. This can be because of changing channels
where the noise between stations is unacceptable, same thing for Auto Programming channels. When the deflection circuit malfunctions, etc…
All this is done primarily to prevent damage to the CRTs or to external amplifiers or speakers connected to the
projection television.
MICROPROCESSOR OUTPUT:
The Microprocessor
high is routed to the Video and Audio Mute circuit.
VIDEO MUTE PATH.
The High fr om pin 49 is routed to
VATION here forward, please use the below explanation when Mute Activation is mentioned.
• MUTE ACTIVATION:
1. When
2. Another route for the high from
3. Another route for the high from
SPOT:
Another circuit attached to the Mute Activation circuit (
deflection PWB when either Horizontal or Vertical deflection is lost. This is to prevent a horizontal or vertical
line from being burnt into the CRTs. See Horizontal and Vertical Sweep Loss Detection circuit and explanation
and circuit diagram for details. This high is input from
. See the Mute Activation circuit explained previously.
Q529
H Blk Loss Det:
Another circuit attached to the Mute Activation circuit (
If the Horizontal Blanking signal is loss to the Signal PWB,
plied with H. Blanking on it’s base. By the activity of the pulse charging
it’s emitter are held high keeping it turned off. If H. Blk is lost, then
blocked by
to the base of
D508
AUDIO MUTE PATH:
See the Mute Activation circuit explained previously as to how
When Mute Activation is turned on, the following circuits are activated.
CRT MUTE PATH:
The high from
to the following diodes,
PWB. When the diodes are supplied with a low on their cathodes, they remove the base voltage fro the RGB
drivers,
Q853, Q803
Q529
to the HVcc 9.3V line through
routed to the following circuits. Through
This pin is also the same pin that FC H Blk and FC V Blk is input. Generally this input is a positive going pulse that blanks the video during the peak pulses which represent retrace. However, when the DC
component is forced high by the action of
RGB.
the Terminal PWB. This turns on
Monitor Out on the Terminal PWB.
and outputs the high from it’s emitter to mute the Audio described later.
and it holds the emitter of
D509
Q527
outputs V. Mute from pin
I001
to the base of
D507
turn on, the collector pulls the base of
and
R5A5
is through
Q528
QV08
is through
Q528
Q525
. See the Mute Activation circuit explained previously.
Q529
Labeled as V MUTE 2: (Emitter of Q527 Mute Activation Circuit)
Shown going to the CRT PWB. Labeled a s V MUTE 1:
is routed to
on the Green CRT PWB,
D853
and
Q8A3
pin 11. This high go es to
PSC
on the Green, Red and Blue CRT PWBs. This shuts off each CRT Drive.
See next page for continuation of Audio Mute Circuit explanation.
when changing channels, Auto Programming, etc… This
49
. The following actions will be labeled MUTE ACTI-
Q529
low and turns it on. It’s collector is connected
Q528
. When
D510
R564, D503
turning on, t his pin goes high and mutes the output of
Q528
D406
and
high. This action turns on
which grounds out the Audio Outputs from the
QV09
R5A1
base) is
Q529
pin (4), through
PPD3
base) is
Q529
Q525
on the Red CRT PWB
D803
turns on, it’s collector goes high. This is
Q528
, and
. This high continues to the
to the base of
will detect the loss. Normally,
Q527
Q856
and into the Rainforest IC
R561
Q527
This signal is generated from the
SPOT.
pin (4),
PPS3
H Blk Loss Det.
and
C546
will discharge through
C546
is turned on.
base. This turns on and supplies a ground
C545
and supplies a high through
Q525
pin 39.
I501
connector on
PST1
. This transistor turns On
to the base of
D511
is sup-
Q526
, the base of
on the Blue CRT
D8A3
R599. C545
Q525
and
is
PAGE 02-06
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