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Order No. ITD1412904GE
Model No. TH-32A400G/K/T/X/V
TH-32A405D
TH-32A408K
TH-32A409K
TH-32A410D/G/K/M/X/V
Hints for Board Repair
( 32inch, 1 board model )
Ver. 1.0
c Panasonic Corporation 2014
Unauthorized copying and distribution is
1 a violation of law.
1
Signal Flow
(TNP4G573**)
A12
IC4900
AMP
(Y Pb Pr) IC8901
Component IC8902
SPI
ROM EEPROM
Video
(V)
A10
LED/
Remote
(K Board)
Audio
I/F
OSD
IC6750 Demod
Antenna
DEMOD (IF) Digital Video
Processor
A21
Video
USB I/F Resize MIX
I/P conv.
HDMI Pixel conv.
AI Gamma
IC8001 RTD2644
2
Troubleshoot of Picture Problem
Is the picture of all
Check the input circuit / IC8001
Input Source NG ? No
Yes
Check by LCD
LCD Panel
Panel Test Mode NG
OK
IC 8001
:When abnormal picture is displayed, troubleshoot by the test pattern in LCD module.
If the picture is no problem, A board must be defective.
If the picture is also abnormal, LCD panel module must be defective.
How to enter :
While pressing "volume(-)" button of the TV unit,
press "option" button of the remote control 3 times within 2 seconds.
How to exit :
Disconnect AC plug
A LCD Panel Module #) The test pattern is created by the circuit
IC8001
T-CON LCD Panel in LCD Panel Module(T-CON board).
(RTK2644)
Test
Resize Pattern
IP conv.
3
Power Supply Distribution (1/2)
The power on sequence is describe by the number of the symbol. ( 1st - 15th )
nd
OFF/STB=38V (2 ) LCD Panel
D7507 D7800 ON= 71V 14th Module
T7301 C7502 L7806/07 C7817
2nd
3 15th
38V VLED Anode
P2
Q7801 Cathode
14th (LED
1
Backlight)
10
9 Q7803
D7102 L
Rectifier O
G Panel-PWM
4
I 13th
1st C LED
CF7101 SUB3.3V BL-ON(Hi=enable)
Vcc Drive
Start Q7301 8 IC7800
DRV 5 14 BL-SOS
Vcc D7502
C7512 2nd Q7502 (1 blink)
IC7301
D7303 D7317 16V
R7342 C7513 7th
8 HV 1-3
-44
5-8 P16.3V
6
VCC VCC
SUB-ON
F7101 6th
Q7510
feedback L7502
FB 2 10 3rd
PC7301 IC7503 STB5.3V
Panel-PWM
9
(TNP4G573**) IC7501 Bright
EN
Power Supply Part Dark
IC7301 automatically starts working after AC plug in. (always working from 1st to 4th ) Lighting Period
OFF
0V
IC7800 starts working after input Vcc and BL-ON/Panel-PWM signal. 4
Power Supply Distribution (2/2)
A10
3rd IC8708
STB5.3V/STB5V STB3.3V/STB_M3.3V/V33AMAIN/ETN_3V3/V33IO/V33LVDS
8 3.3V 1 5
4th
Q8002 STBRST
V33A/V33HDMI/V33POR
3
Tr
SUB3.3V 1
7th P16.3V LED
8th
2 IC8700 L8700 VCCK1.1V/V11CORE Remote
DCDCEN 1.1V 131
EN 6th 110
SUB-ON
Tr x2 64
13th
EN DCDCEN2 BL-ON / Panel-PWM
JK8601
IC8702 L8702
SUB5V IC5602 65
2 5V 1USB_Pwr 6 1
BL-SOS (1 blink) IC8001
Remote
9th USB
RTD2644
5th
IC8707 10th
DDR1.8V/DDRV KEY3
3 1.8V 4 Power
122
_SW
IC8711 10th
SUB3.3V 56
4 3.3V 3
8 8
IC8709 X8301
TNR3.3V/SITU_3.3V IC8901 IC8902
3 3.3V 4
SPI EEPROM
P16.3V IC8705 10th
TNR1.8V/SITU_1.8V PANEL12V_ON
3 1.8V 4
IC4900 11th
2
AMP 8 21
3
IC6750
TUNER X6750
PANEL12V_ON
A21
IC8300 L8300 PNL12V
To LCD (TNP4G573**)
12V 27-30 Module
2
12th (T-CON) Signal Processing Part
5
Troubleshoot of Power On Problem (1/2)
Check by power on sequence ( from 1st to 13th )
< symptom >
Check input voltage of
F7101/CF7101
Check output voltage of IC7503 (16V) and
No Power/No Operation STB5V, STB3.3V Check VLED voltage (38V)
Q7301/IC7301/D7317,
No or NG
D7502/IC7503
Low voltage at P2-3pin
3rd 4th
OK 2nd OK
IC7503/IC8708
(check short circuit of STB power line)
Check TV_SUB_ON signal (=High) No signal = IC8001
and voltage P16.3V line No P16.3V = Q7502/D7502
6th 7th NG
OK
Check short circuit of each power line
SUB5V,SUB3.3V,DDR1.8V,VCCK1.1V Power IC of Defective line
(PNL12V,TNR3.3V,TNR1.8V) NG
8th 9th
All OK
If all output voltages are OK,
IC8001
6
Troubleshoot of Power On Problem (2/2)
< symptom >
Voltage Check of VLED
Check short circuit of
SOS 1 blink Q7801,7803
Just before shutdown LCD Panel
OK (rise up from 38V to 71V) OK
(71V)
Shorted NG
(38V or lower)
Q7801,7803
(IC7800)
Voltage Check of PWM
Signal input (pin4) of C7800 IC7800
Just before shutdown Rise up
(Not 0V)
Keep 0V
IC8001
7
Parts Change Note
1. Add zener diode (DZ2J068M0L) to pad of C8759 (no use)
POLARITY MARKING
8
2. Add surge absorber (D4EDY5R5A038) to pad of C8782 (no use)
3. Add surge absorber (D4EDY5R5A038) to pad of C8707 (no use)
9
Parts Location
Q7301
IC7503(STB5V)
D7102
D7502
CF7101
D7507
IC7301
Q7801
F7101
Q7502
IC7800 P2
Q7803
D7800
IC8707 (DDR1.8V) Q7510
L8702 (Left side=SUB5V)
L8300 (Left side=PNL12V)
L8700 (Left side=VCCJ1.1V)
A10 IC8711 (SUB3.3V)
A21
IC8708 (STB3.3V)
IC8709 (TNR3.3V)
IC8705 (TNR1.8V)
10
Revision History
Version Issued/Revised Revised content
date
Ver. 1.0 11.Dec.2014 First version
11