HITACHI 50V720, 50VF820, 55VF820, 60VF820, 50VG825 Service Manual
...
January 2006 (ver a)
HITACHI
PROJECTION
TELEVISION
2006 MODEL RELEASE
DIGITAL HD READY LCD
Model Chassis Remote P/N
50V720
50VF820
55VF820
60VF820
50VG825
55VG825
60VG825
LC-57 CLU-4352UG2 HL02073
LC-58 CLU-3842WL HL02062
LC-58 CLU-3842WL HL02062
LC-58 CLU-3842WL HL02062
LC-58E CLU-3851WL HL02065
LC-58E CLU-3851WL HL02065
LC-58E CLU-3851WL HL02065
Service Web Site
http://www.hitachiserviceusa.com
CONTENTS... 2006 LC-5X Chassis Projection Television Information
Materials Prepared by… Alvie Rodgers C.E.T. (Chamblee, GA.)
LC-5X BLANK PAGE “USE FOR NOTES”
INTENTIONALLY LEFT BLANK
January 2006 (ver a)
TOPICS PAGE
LC-5X TABLE OF CONTENTS
SECTION (1) POWER SUPPLY DIAGRAMS:
• Generic Power Supply Circuits Explained ------------------------------------ 01-01
• A Out Shutdown Diagram --------------------------------------------------------- 01-03
• B~E Out Shutdown Diagram ----------------------------------------------------- 01-04
• F Out Shutdown Diagram --------------------------------------------------------- 01-05
• F In Shutdown Diagram ----------------------------------------------------------- 01-06
• 5V Standby Regulation Circuit Diagram ------------------------------------- 01-07
• 5.6V Regulation Circuit Diagram ----------------------------------------------- 01-08
• Power On Circuit Diagram ------------------------------------------------------- 01-09
SECTION (2) VIDEO CIRCUIT INFORMATION:
Materials prepared by
Alvie Rodgers C.E.T.
• Video Signal Selection Circuit Diagram ------------------------------------- 02-01
SECTION (3) AUDIO CIRCUIT INFORMATION:
• Audio Signal Selection Circuit Diagram ------------------------------------- 03-01
• Audio Woofer Circuit Diagram -------------------------------------------------- 03-02
SECTION (4) PWB PART NUMBERS AND REAR INPUTS:
• LC-58 PWB Part Numbers ------------------------------------------------------- 04-01
• LC-58E PWB Part Numbers ----------------------------------------------------- 04-02
• LC-57 PWB Part Numbers ------------------------------------------------------- 04-03
• LC-57 and LC58 Rear Inputs --------------------------------------------------- 04-02
SECTION (5) THINGS YOU SHOULD KNOW:
• See the index for this section after the Section 5 Divider. ---------------- 05-00
Table of Contents Page 1
LC-5X BLANK PAGE “USE FOR NOTES”
INTENTIONALLY LEFT BLANK
POWER SUPPLY
INFORMATION
LC-5X
CHASSIS INFORMATION
SECTION 01
LC-5X BLANK PAGE “USE FOR NOTES”
INTENTIONALLY LEFT BLANK
LC-5X GENERIC POWER SUPPLY SHUTDOWN EXPLANATION
GENERIC POWER SUPPLY SHUTDOWN INFORMATION:
The Protect Circuit has been broken down into 4 distinct Sections. The input/outputs are identified by letters in
circles (A) ~ (F). These Circuits are involved in the Shutdown inputs which shuts off the Power Supply in the
LC-5X Chassis.
UNDERSTANDING SYMBOLS ON THE DIAGRAMS:
(Sheet 13)
In the case of the LC-58 Chassis, the Schematics are shown between pages 129 ~ 151. This represents 23
individual pages within the Service Manual PA-0210. To help identify the location of particular drawings, you
will notice comments like “Sheet 13”. In this case, the diagram is taken from the 13th page of the Schematics
shown in the Service Manual .
(17)
On the Power Supply Shutdown circuit diagrams you will notice small number at different locations along the
shutdown path. The small numbers represent the number of shutdown “events” that are possible at this point in the
circuit. As the lines continue, the numbers will grow and they are cumulative.
To help with Inputs and Outputs from the distinct Sections of the drawings, Symbols as shown on the left
are used. This will help the Technician navigate between drawings more easily.
GENERIC SHUTDOWN CIRCUITS EXPLAINED:
The following circuits are commonly used in Hitachi LCD product and relate to the drawings used for
Shutdown:
VOLTAGE TOO HIGH DETECTION
(See Figure 1)
This circuit is the Voltage Too High Detection circuit. In the example shown in Figure 1, the zener diode
Z01 is connected to a voltage divider R01 and R02. If
the voltage source rises too high, the voltage at the divider center point will rise as well and trigger or fire
the zener diode which produces a Shutdown signal
through D02 and on to the appropriate circuit.
VOLTAGE LOSS or SHORT DETECTION
(See Figure 2)
One circuit used is the Voltage Loss or Short
Detection circuit. This is a very simple circuit that
detects a loss of a particular power supply and supplies
a Pull-Down path for the base of a PNP transistor Q1.
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 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 LOW
on its cathode, turning it ON. This will allow a current
path for the base bias of Q1, which will turn it ON and
generates a Shutdown Signal.
Z01
D02
Voltage
Loss
Detector
Figure 2
R01
R02
Figure 1
Shutdown Signal
Any Power Supply
Voltage Too
High Detector
Shutdown
Signal
Any Positive
B+ Supply
B+
Q1
(Continued on next page)
PAGE 01-01
LC-5X GENERIC POWER SUPPLY SHUTDOWN EXPLANATION
GENERAL INF O RMATION:
This explains the Overall Power Supply Shutdown Circuits: Which turns off the Relay Drivers Q942, Q943 and Q944.
There are Four Relays which are activated when Power 1 and Power 3 go high. These Relays are all protected (turned off) by
the 17 possibl e shutdown inputs.
• RELAY S901 Controlled by Power 3 to Tr ansistor Q942:
This relay supplies AC to Relay S902 and S903 explained below.
• RELAY S902 Controlled by Power 1 to Tr ansistor Q943:
This relay supplies AC to the Signal Power supply Bridge Rectifier D902.
• RELAY S903 Controlled by Power 3 to Tr ansistor Q944:
This relay supplies AC to the Lamp Power PWB.
• RELAY S904 Controlled by Power 3 to Tr ansistor Q944:
This relay supplies B+ to the Audio Circuit.
Q980 and Q981 Relay Inhibit Activation. (SHUTDOWN) called COMMON ACTION CIRCUIT.
All 17 Shutdown events will cause the above mentioned relays to turn off. This action will stop all secondary power
supplies.
See the LC-5X Protect (F In) Shutdown Circuit for details.
If any of the shutdown circuits activate, the base of Q980 will go High. This turn s on Q980 and rem ov es the Power On Hig h s
from PPT3 connector pins 6 and 2 called Power_1 and Power_3. With this, the main power supplies will STOP. Q981 operates as a “l atch”. This pr ev e n t s Q980 from turning off if the shutdown signal disappears after shutdown.
SOME SHUTD OW N CIRCUITS ARE DEFEATED IN STANDBY MODE . (Set Off).
When the set is turned off (called Stand By), some of the shutdown inputs are not active because the voltages being monitored
are not on.
SHUTDOWN INP UT S EXPLAINED:
GENERAL INF O RMATION CONTINUE D: (See previous page for generic shutdown circuit details):
All of the Power Supp ly Sh ut down circuitry can be brok e n down into the following catego r i es;
• Voltage Missing Detection or Short Detection
• Voltage Too High Detectio n
Note: The Fa n failure or “Stopp ed” alarms work the sa me as voltage too hig h detection. Norma lly when a fan is
running, the pull-up resi stor attached to the Fans B+ will not be allo we d to pull up hi gh du e to th e Fan s int e rna l Hall
element’s action when the Fan is rotating. If the fan stops, the Pull-Up resistor will pull the shutdown signal
“Alarm” up high. (See (B~E Out) Protect shutdown diagram).
The Door open signal works the same. A mechanical switch is located in such a fashion that when the door is
closed, the switch is activated. This in turn pulls the door alarm voltage low and will not allow an “Alarm” to be
generated as long as the door is closed. (See (B~E Out) Protect shutdown diagram).
Lamp Alarm. A mechanical switch is located in such a fashion that when the Lamp is installed, the switch is activated. This in turn pulls the door alarm voltage low and will not allow an “Alarm” to be generated as long as the
Lamp is installed and th e Lamp do o r is close d. (See (B~E Out) Protect shutdown diagram).
Temp Sensor. The Temperature sensor is normally in a state of Low Ohms. This prevents the Pull Up resistor from
generating a Temperature Alarm. If the Fan Duct gets too hot, the Temperature Sensor resistance goes up and the
Temperature alarm is generated. (See (A Out) Protect shutdown diagram).
PAGE 01-02
LC-5X (A Out) PROTECT SHUTDOWN DIAGRAM
Drive Sheet 15
The Protect Circuit has been broken down into 4 distinct Diagrams. The input/outputs are identified letters in circles (A) ~
(F). This Circuit begins the Shutdown input which shut off the Power Supply in the LC-58 Chassis. The Schematic are
shown on 23 pages within the Service Manual PA-0210. This section is taken from the Drive Circuit on the 15th page of
the Schematics shown in the Service Manual .
+5.6V
I801
I804
I808
42
3.8V
D801
81
73
+3.3VM
D806
42
+3.3V
D805
From D801 Anode Monitors +3.8V from I801 Pin 4
From D805 Anode Monitors +3.3V from I808 Pin 4
From D806 Anode Monitors +3.3VM from I804 Pin 7 and 8
Drive Sheet 19
Temp Sensor normally Low Ohms (Closed).
High Temp High Ohms (Open).
SBY +5V
PDE
R6D1
R6M1
R6M7
0 Ohm
R688
2
Q604
R6M6
0 Ohm
Temp
Sensor
On Lamp
Housing
R602
3
R6M0
See (B~E out) Protect
Shutdown Diagram
PDT
10
PROT DRV
PROT SW
A
9
TEMP_ALARM
Normal
Active
PAGE 01-03
LC-5X (B~E Out) PROTECT SHUTDOWN DIAGRAM
E
D
To DM/Power I/F
DooR
Alarm
Fan
Prot
Fan
Alarm
Sheet 11
See (F Out)
Protect
Shutdown
Diagram
1
4
Fan Sheet 13
QF01
IF02
2
DF08
3SW +16.5V 5
Sby +5v
CF15
DF05
Fan 12V
DF03
RF28
RF29
DF07
RF39
RF41
PTW1
1
PFA1
1
2
3
PFA3
1
2
3
To Door Sw PWB
on Control
Sheet 22
For Optical Engine
Fan Alarm
Fan +10V
Fan Gnd
For Lamp
Fan Alarm
Fan +10V
Fan Gnd
PFA4
For Chassis
DF01
Power
3
1
Fan Alarm
RF42
2
Fan +10V
3
Fan Gnd
PFA6
For Digital Module
DF04
1
2
Fan Alarm
RF38
2
IF03
35
Fan 10V
Fan +10V
RF34
3
0 Ohm
Fan Gnd
PDT
C
B
Temp
Alarm
Prot
DRV
1
3
RF26
RF27
1
9
3
10
See (A) Protect
TEMP ALARM
To Drive Sheet 15
PROT SW
A
Shutdown Diagram
PAGE 01-04
LC-5X (F Out) PROTECT SHUTDOWN DIAGRAM
DJ15
Fan +10V
DJ16
QJ06
RJ32
Fan +12V
RJ34
PRoT
B
DRV
DJ04
4
To Fan Drive
Sheet 13
DJ23
DJ25
See (B~E) Fan Protect
Circuit Diagram
To Fan Drive Sheet 13
DooR
Alarm
E
Temp
Alarm
C
DJ22
RJ31
RJ05 RJ06 RJ07
DJ21
DJ17
RJ3O CJ08
DJ18
5
DJ00 DJ01
1
6
5
DJ15
5 11
Fan
Alarm
411
D
DJ09
See (F In) Protect
Shutdown Circuit Diagram
for Continuation.
Sig + 5.6V
DJ08
QJ02
RJ18
RJ17
Sig +10.5 & 16.5 V
Loss Detection
RJ19
PPT3
To Power
Sheet 20
Sig + 10.5V Sig + 16.5V
RJ08
RJ10
CJ04
DJ07
CJ03
7
DJ10
16.5 V Too High
Detection
F
DJ11
Active
Normal
15
< Protect >
4
1
3
DM/POWER/I/F Sheet 11
PAGE 01-05
LC-5X PROTECT (F In) SHUTDOWN CIRCUIT
From S901
For
Signal
Power
Supply
D902
Q943
Relay
Driver
SBY +5V
AC
S902
From Sub
Micro
From Digital
Module
Pin 20, Q021, Q025 Pin 81
Power 12Power 3
6
onoff
R947R946
D958
D941
R944
D946
D945
SBY +5V
R941
D942
onoff
S903
D944
R943
D940
Q942
R940
From S901
AC
2.2 ohm
F904
PPT3
PPT3
SBY +5V
S901
3
S904
D943
Relay
Driver
Audio B+
Audio Vcc
11 12 13
AC
2.2 ohm
F904
For
S902
S903
Audio
Vcc
Raw B+
AC
Hot
Ground
AC 175 On
See Protect (F Out)
Shutdown Circuit Diagram
for Inputs.
F903
D902
R924
AC
R925
D915
9V
(8.9V ~ 9.3V)
R926
R927
C916
4
6
T902
F
7
15
<PROTECT>
Normal
Active
Power
Sheet 20
R945
To Lamp Power
Q944
Sig +10.5V
Relay
D950
R980
PAGE 01-06
Q980
D951
C980
D948D947
Q981
R982
R981
C981
17
R942
Driver
D988
D990
1
Excessive Sig +10.5V
Voltage Detection
Q901
I902
Run B+ 19V
I905
2
1 3
R923
D959
AC Voltage Too High
SBY 5V
4
1
15
Detection
LC-5X (STB 5V) Stand By Power Supply
AC
D901
-+
C911
F902
C908
3
R908R908R908
T901
5
I901
1
4 2
7
8
D906
C912
R906
D949
C940
+7.5V
1
I942
2
C957
PPT2
173
SBY +5V
I904
R957
4
D907
5.6V
3 2
1
R958
Power
Sheet 20
D962
6.8V
PAGE 01-07
1 of 3
T902
9
7.5P/P
LC-5X CHASSIS POWER SUPPLY SIGNAL 5.6V REGULATION
Power
Sheet 20
D913
C925
Sig +10.5V
11
From LP06 pin 4
Supplied from Relay S903
C926
D909
1/2 AC 5
AC Supplied from
Relay S902
Raw B+ from D902
150V
2 of 3
D910
Start Up
C933
163.6V
T902
4
F903
6
D914
Run
19.3V
1
20 11
21
9
Vcc
OCP/FB
I902
Driver/
Output IC
DS
R916
R917
R918
10
17
18
All 0.47
Hot Ground from negative
side of bridge rectifier D902
R921
R922
C929
R962 R961
Sig +5.6V
2.4V
R966
4.4V
C930
C950
I941
1
2.1V
FB
I906
3
4
Regulator
Photocoupler
3
7.6V
2
R963
8.6V
1
R964
2
7.6V
3 of 3
T902
16
15
14
10K
E942
Sig +5.6V
1
D955
2
C948
3
Cold Ground from pin
14, 17, 20 of T902
4.59A
PPT2
1
2
3
4
5
6
7
Sig +5.6V
PAGE 01-08
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