Akira PTV4300 Schematic
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CHASSIS: PDT-6
2
MODEL:
PTV-4300
Model No: PTV-4300
Version 1.0
CONTENTS
1 General Description & Safety Instructions ……………………… .4
1.1 General Description …………………………………... ……..4
1.2 Maintenance Instructions …………………………………….5
1.3 Electrical Specification ………………………………………5
2 Signal Processing Flow Chart ………………………………… ….6
3 Troubleshooting Charts ……………………………………… ….10
3.1 Safety Precaution ………………………………………… ..10
3.2 Troubleshooting Charts …………………………………… .11
4 Characteristics of Pins of Main ICs .............……………………..14
3
5 Convergence Adjustment ……………………………………… ..28
5.1 Description of Function Keys on Remote Controller for
Convergence Adjustment ……………………………… …..28
5.2 Convergence Adjustment Procedures ………………………29
2
6 I
C-bus Data …………………………………………………… ..33
7 Parts List & Replacement Parts List ………………………… ….36
8 Appendix …… …………………………………………………...62
8.1 Printed Circuit Board …………………………………….....62
8.2 Schematic Diagram ……………………………….. ……….64
8.3 Exploded View …………………………………….. ………65
8.4 BPBT Board ……………………………………….. ………66
8.5 Circuit Diagram ……………………………………… …….67
Model No: PTV-4300
Version 1.0
1. General Description & Safety Instructions
1.1 General Description
WARNING!
In order to prevent electric shock, do not remove cover.
No user-serviceable parts inside refer servicing to qualified service personnel.
Features
Conventional color TVs apply 50Hz/60Hz alternate scanning and scan a picture in two separate fields,
which results in distinct scanning structural lines and horizontal flicker. As the TVs can display only
25/30 frames of picture per second, it cause wide-range image flicker. The larger the TV screen is, the
more conspicuous the problems are. Therefore, watching this kind of TV, you are susceptible to
eyestrain.
With the world's the state of the art digital inverter technology, our rear projection TV is an improved
product for better performance. With 60Hz progressive scanning, the RPTV can display a whole frame
of picture per scanning and increase display frequency from 25 frames of picture per second to 60. At
the same period of time, the RPTV can scan lines of up to 1250, two times as many as the conventional
TVs. The RPTV removes completely wide range image flicker and horizontal flicker, and offers
sharper and more lifelike pictures.
• Precision vision: With progressive scanning, the RPTV automatically increases vertical
frequency from 50Hz to 60Hz and horizontal frequency from 15625Hz to 31250Hz.
• Automatic white balance correction: The RPTV correct automatically white balance each
power-on, which avoids color distortion due to long time use and delivers consistently vivid
color.
• VGA terminal: You may connect a computer to the VGA terminal on the RPTV and use the
RPTV as a large-screen multimedia display terminal, through which you can surf Internet
and play games.
• Advanced projection tube" High brightness and high-resolution projection tube of the
world's advanced level guarantees high brightness and reliable focus performance.
Other features
• 7" projection tube (3 pieces)
• 470MHz CATV ready
• Multi system/digital NICAM reception
• Theatre and music surround system
• Still picture
• On/off timer
• Wide power voltage range
• Digital frequency synthesized tuner
• Easy operation
• High-contrast and high-luminance black optical screen
• 236(0-~235) programs preset
• Hi-Fi audio system
• DVD VIDEO COMPONENT IN terminals
• No-signal-off
2
C bus control
• I
• Digital matrix convergence
• Luminous remote controller
• Program swap
Model No: PTV-4300
Version 1.0
4
1.2 Maintenance Instructions
• If a problem occurs (such as no picture or no sound), or if smoke or an abnormal odor starts
to come out from the RPTV, immediately unplug the power cord and contact the service
agency as soon as possible.
• High voltage inside! Non-professionals can not open the back cover.
• Do not expose the RPTV to direct sunshine or put it near heat sources.
• Do not put the RPTV in a place subject to moisture and dust or where the rain can reach.
• Set up a lightning arrester when an outdoor antenna is used. Do not turn on the RPTV in
thunder days. At lightning intervals, pull off the power cord and antenna cable.
• Please turn off power supply of the RPTV while outgoing. In ease of the RPTV is not used
for a long period of time, please pull off the power cord and antenna cable.
• Do not put anything on the RPTV, especially objects filled with water or chemical material
on top of the RPTV. Doing so may cause deformation to the cabinet and screen or water to
spill into the RPTV.
• Install the RPTV in a place with good air circulation. Do not cover the ventilating holes to
prevent the RPTV from overheating.
• Avoid hard objects hitting on .the RPTV (especially screen) or severe vibration when
moving the unit. Doing so may adversely affect location of the inside lens.
• To prevent the RPTV from falling off or tip over, place the RPTV on stable and flat surface
without vibration and fix it according to Operation Manual.
• Do not switch the RPTV on and off frequently. Doing so may shorten life span of the RPTV.
• Do not switch on or off the RPTV by plugging or pulling off the plug.
• When using TV games, computers and similar products with your RPTV, keep the
brightness and contrast functions at low setting. If a fixed pattern is left on the screen for a
long period of time, especially at a high brightness or contrast setting, the image can be
permanently imprinted onto the screen, which is not covered by your warranty.
• Wipe the cabinet regularly using only a soft cleaning cloth.
• If the cabinet is particularly dirty, soak a soft cloth in water to which a small amount of
neutral detergent has been added, and dry it to wipe the cabinet. Do not use organic solvent.
• Keep the screen dry. Wipe the screen using a dry soft cloth. Observe the instructions if using
a synthetic rag.
1.3 Electrical Specification
Rated voltage AC 150 ~ 260V, 50Hz / 60Hz
Rated power consumption ~250W
Receiving channels VHF: C1 ~ C12 UHF: C13~C57 CATV: Z1~ Z37
Color system PAL 4.43, PAL 3.58, NTSC 3.58, NTSC 4.43,
SECAM
Sound system D / K, I, M, B/G
Audio output 15W + 15W (THD = 7%)
5
Model No: PTV-4300
Version 1.0
10
3. Troubleshooting Charts
3.1 Safety Precaution
WARNING:
Service should not be attempted by anyone unfamiliar with the necessary precaution on the RPTV. The
following are the necessary precaution to be observed before servicing.
1. Cold ground near the point to be tested, not warm ground on the power supply board shall be 0
reference when testing voltage at circuit joints.
2. In the process of servicing, do not turn on/off the set quickly and frequently. The minimum
internal shall be more than 30s.
3. Always be certain that the wires are connected or wrapped as it was after completion of servicing.
4. Keep signal and supply wires from high voltage or high temperature components.
5. Be careful and do not scratch the screen and lens when removing the screen.
6. Normally, do not perform any operation (e.g. press VOLUME UP/DOWN buttons) under the item
of "INIT" of Data menu for final adjustment in order to avoid initiating final-ad-justed data.
Product Safety Notice
Many electrical and mechanical parts in this chassis have special safety-related characteristics.
These characteristics are often passed unnoticed by a visual inspection and the protection afforded by
them cannot necessarily be obtained by using replacement components rated for higher voltage,
wattage, etc. Replacement parts, which have these special safety characteristics are identified in this
manual and its supplements.
Electrical components having such feature are identified by printing on the schematic diagram and the
part list. Before replacing any of these components, read the part list in this manual carefully.
Unauthorized substitutions may result in fire, electric shock or other hazards.
Model No: PTV-4300
Version 1.0
123456897
N
Nc N
N
4. Characteristics of Pins of Main ICs
TDA9178
Pinning and external components of the TDA9178:
1 Sc Sandcastle input pin
2 Nc Not connected pin
3 ADextl External AD-conversion #1 input pin
4 ADext2 External AD-conversion #2 input pin
5 Adext3 External AD-conversion #3 input pin
6 Yin Luminance input pin
7 ADR Address selection input pin
8 uin -(B-Y) signal input pin
9 Vin -(R-Y) signal input pin
10 TP Testpin connected to ground
11 SCL I2C.bus: clock input pin
12 Nc Not connected pin
13 Nc Not connected pin
14 SDA I~C-bus: data input pin
15 DECDIG Decoupling digital supply
16 Vout -(R-Y) signal output pin
17 Vout -(B-Y) signal output pin
18 Vee Ground pin
19 Yout Luminance output pin
20 Vee Supply-voltage pin
21 Sout Luminance output for SCAVEM
22 CF Cue-flash output pin
23 Nc Not connected pin
24 Nc Not connected pin
Model No: PTV-4300
Version 1.0
Sc
c
ADext1
ADext2
ADext3
Yin
ADR
Uin
Vin
TP
SCL
Nc
TDA9178
10
11
12
13
14
15
16
17
18
19
Sc
20
21
22
23
24
c
CF
Sout
Vcc
Yout
Vee
Uout
Vout
DEC
SDA
c
DIG
14
19
TDA6111Q
Video output amplifier
General description
The TDA611Q is a video output amplifier with 16 MHz bandwidth. The device is contained in a single
in-line 9-pin medium power (DBS9MPF) package, using high-voltage DMOS technology, intended to
drive the cathode of a color CRT.
Quick reference data
Symbol Parameter Conditions Min. Typ. Max. Unit
V
DDH
V
DDL
I
DDH
I
DDL
V
I
V
OC,
Vfb
T
stg
T
amb
high level supply voltage 0 - 250 V
low level supply voltage 0 - 14 V
quiescent high voltage supply
current
quiescent low voltage supply
current
input voltage 0
output voltage
storage temperature -55 - +150 °C
operating ambient temperature -20 - +65 °C
VOC=0.5VDD
VOC=0.5VDDH 5.0 6.8 8.0 mA
7.0 9.0 11.0 mA
H
-
VDD
-
L
VDD
VDD
V
L
V
H
Pinning
Symbol Pin Description
Vip 1 non-inverting voltage input
V
2 supply voltage LOW
DDL
Vin 3 inverting voltage input
GND 4 ground, substrate
Iom 5 black current measurement output
V
DDH
6 supply voltage HIGH
Vcn 7 cathode transient voltage output
Voc 8 cathode DC voltage output
Vfb 9 feedback voltage output
Model No: PTV-4300
Version 1.0
V
V
DDL
Vin
GND
Icm
V
DDH
Vcn
Voc
Vfb
ip
1
2
3
4
5
6
7
8
9
TDA6111Q
Pin configuration
TDA9181
Integrated multistandard comb filter
Pinning
Symbol Pin Description
CIN 1 chrominance input signal
INPSEL 2 input switch select input
Y/CVBS2 3 luminance or CVBS input signal 2
DGND 4 digital ground
VDD 5 digital supply, voltage
VCC 6 analog supply voltage
SC 7 sandcastle input signal
FSCSEL 8 subcarrier select input
FSC 9 subcarrier input signal
SYS2 10 standard select 2 input
SYS1 11 standard select 1 input
Y/CVBS1 12 luminance or CVBS input signal 1
AGND 13 analog ground (signal reference)
Y/CVBSOUT 14 luminance or CVBS output signal
OUTSEL 15 output switch select input
COUT 16 chrominanee output signal
Model No: PTV-4300
Version 1.0
20
21
Pin configuration
Table 1: Pin Function, Reference Voltage and Resistance to Ground of TDA9178
Resistance
Pin
Short Description
No.
1 Sandcastle Pulse Input 0.77 0.77 Infinity
2 Not Connected Pin 0 0 0.1
3 A/D Input 1 0 0 0.1
4 A/D Input 2 0 0 0.1
5 A/D Input 3 0 0 0.1
6
7 Ground 0 0 0
8
9
10 Not Connected Pin 0.41 0 0
11 Clock Signal Jumper 3.2 Variant 3.2 Variant 5.8K
12 Not Connected Pin 0 0 0
13 Not Connected Pin 0 0 0
14 Data Signal Jumper 2.9 Variant 3.1 Variant 5.8K
15 De-coupling Capacitor 5.07 5.06 Infinity
16
17
18 Ground 0 0 0
19
20 +SV Power Supply +8.01 8.01 0.9K
21 VM Signal Output 2.21 2.27 Infinity
22
23 Ground 0 0 0
24 Ground 0 0 0
Model No: PTV-4300
Version 1.0
Inverter YD Luminance Signal
Input
Inverter UD Color Difference
Signal Input
Inverter VD Color Difference
Signal Input
V Color Difference Signal Output
after Transient Improvement
U Color Difference Signal Output
after Transient Improvement
Luminance Signal (Y) Output after
Transient Improvement
Low Frequency Flicker Detection
Output
Static
Voltage
1.51 1.47 0.1
1.50 1.46 0.1
1.51 1.47 0.1
2.63 2.67 Infinity
2.63 2.64 Infinity
0.73 0.8 Infinity
2.72 0.73 Infinity
Dynamic
Voltage
to
Ground
Table 2: Pin Function, Reference Voltage and Grounding Resistance of TDA9321
Resistance
Pin
No.
Short Description
1 Sound IF Signal Processing AGC Filter 2.77 3.11 Infinity
2 Video IF Signal Input 4.65 4.62 69.8K
3 Video IF Signal Input 4.65 4.62 69.8K
4 PIF Amplifier AGC Filter for External Video 1.29 4.01 Infinity
5 2nd Sound IF Signal Output 3.37 3.36 Infinity
Detection Phase-locked Loop Filter for External
6
Video
7 Connects IF Coil T101 3.81 3.79 Infinity
8 Connects IF Coil T101 3.81 3.79 0
9 Ground 0.11 0.11 3.3K
10 TV Video Signal Output 4.81 3.12 0.9K
11 8V Power Supply 8,13 8.09 Infinity
TV Video Signal Input Processed by Sound
12
Trapper
TV Video Signal Output Processed by Group
13
Delay line
14 TV Video Signal. Input 3.57 3,57 Infinity
15 Not Connected Pin 0.51 0.13 88.K
16 Connects Video Signal from AV2 Terminal 3.52 3.51 Infinity
17 Not Connected Pin 0,5 0.13 88.5K
18 CVBS2 Video Signal Input 4.35 3.57 Infinity
19 M System Control Signal Output 4.91 4.91 Infinity
20 Connects Y Luminance Signal from S1 Terminal 3.53 3.51 Infinity
21 Connects Chrominance Signal from S 1 Terminal 0.22 0.22 99.1K
22 Not Connected Pin 0.11 0.11 Infinity
Connects Luminance Signal (Y-3) from $3
23
Terminal
Connects Chrominance Signal (C-3) from S3
24
Terminal
Outputs Switching Signal SYSI for Controlling
25
Comb Circuit
TV/AV Video Signal Output, to Comb Circuit
26
SAA4961
Outputs Switching Signal SYS2 for Controlling
27
Comb Circuit Status
28 Luminance Signal Input from Comb Circuit 3.63 0 Infinity
29 Chrominance Signal Input from Comb Circuit 0.22 0 99.3K
Color Sub-carrier Signal Output, to Comb Circuit
30
SAA4961
31 Ground 0.11 0.11 0
32 Not Connected Pin 3.44 3.71 Infinity
33 Power De-coupling Filter Capacitor 5,02 5.01 Infinity
34 Video Signal Output, to AV Output Port 2.19 2.6 Infinity
35 Not Connected Pin 4.12 3.11 37.3K
Connects DVD Jack, Inputs V Color Difference
36
Signal (or External R1 Primary Color Signal
Input)
Connects DVD jack, Inputs Y Luminance Signal
37
(or External G1 Primary Color Signal Input)
Fixed Level RGB1 Input with Fast-Blanking input,
39
Forced into
Model No: PTV-4300
Version 1.0
Static
Voltage
Dynamic
Voltage
to
Ground
3.49 2.89 Infinity
3,52 3.94 Infinity
2.94 3.37 Infinity
3,53 3.51
0.22 0 99.0K
0.11 0 Infinity
3.44 4 Infinity
5.01 5.00 Infinity
4.25 0 Infinity
3.29 4.79 Infinity
3.31 2.82 Infinity
2.75 2.74 22.0K
22
Resistance
Pin
No.
Short Description
Static
Voltage
Dynamic
Voltage
to
Ground
Connects DVD Jack, Inputs U Color Difference
38
Signal (or Extenaal B1 Primmy Color Signal
3.16 2.80 Infinity
Input)
40 Not Connected Pin 3.14 4.03 Infinity
41 Not Connected Pin 3.35 2.84 Infinity
42 Not Connected Pin 3,36 2.86 Infinity
43 Not Connected Pin 3.36 2.86 Infinity
44 Ground 0.11 0.11 0
45 8V Power Supply 8.17 8.16 0.9K
46 I2C Bus Clock Signal Jumper
47 I2C Bus Data Signal Jumper
3.2-3.26
Variant
2.96-3.12
Variant
3.44 5.8K
3.37 5.9K
48 Not Connected Pin 0.80 0.12 173.5K
Luminance Signal Output, to Inverter Processing
49
Assembly
U Color Difference Signal Output, to Inverter
50
Assembly
V Color Difference Signal Output, to Inverter
51
Assembly
2.87 3.46 Infinity
2.45 2.27 Infinity
2.43 2.42 Infinity
52 Color Phase-demodulation Filter Capacitor (PLL) 4.56 5.05 Infinity
53 SECAM De-modulation Filter Capacitor 4.12 0 Infinity
54 4.43 MHZ Crystal 2.52 2.55 Infinity
55 3.582 MHZ Crystal 2.54 2.54 Infinity
56 3.579 MHZ Crystal 2.54 2.54 Infinity
57 3.575 MHZ Crystal 2.54 2.54 Infinity
58 Line Phase-discriminator 1 Filter Network 3.93 4.18 Infinity
59 Not Connected Pin 0.84 0.84 Infinity
Horizontal Sync. Signal Output HA, to Inverter
60
Circuit
0.5 0.5 Infinity
61 Vertical Sync. Output VA, to Inverter Circuit 0.17 0.16 Infinity
62 Radio AGC Control Voltage Output 6.67 6.77 8.8K
63 Sound IF Signal Input 4.64 4.63 69.8K
64 Sound IF Signal Input 4.64 4.63 69.8K
23
Model No: PTV-4300
Version 1.0
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