LG 32LG3DCH (CHASSIS:LA76B) Service Manual ▷ View online
1. Power-Up Fail
2. No OSD
- 13 -
TROUBLE SHOOTING
Check P1201 All
Voltage Level (5V, 12V, 16V)
Check Power connector
OK ?
Replace Power board
Y
N
Y
Check Q706 OUT
Voltage Level 3.3V
Replace Q706
Recheck
Y
N
Check
IC706(3.3V),IC705(3.3V),IC709(2
.6) ,IC710(1.25V)OUTVoltage
Level
Replace
IC706,IC705,IC709,IC710
Recheck
Y
N
Y
Check X100 Clock
12MHz
Replace X100
Y
N
Replace IC105 Flash Memory
N
N
Redownload or replace
Flash Memory IC105
Check LD903(LED) LED
BLINK?
Check L900 Voltage Level(5V)
Check X900 Clock
7.3728MHz
N
Y
Y
Redownload or replace
PTC uCOM IC900
Y
Check P1201
Voltage Level ST5V
Check
Power connector
Replace Power board
Check LVDS Cable
Check LCD Module
Control board
Y
N
Y
Y
Check Q706 OUT
Voltage Level 3.3V
Replace Q706
Y
N
Replace Cable
N
- 14 -
3. Digital TV Video
Check RF Cable
Check IIC Signal
TU400 #7, 8 Pin
Maybe Tuner(TU400) has problems
Check LGDT3304 Output
Clock(R404), Data(AR436,437),
Sync(R441)
Y
Y
N
Check Tuner 5V Power
IC701
Replace IC701
Y
N
Y
Maybe LGDT3304(IC400) has
problems
N
Maybe LGDT3304(IC400) has
problems
Check LD400 color
Bad Tuner. Replace Tuner.
None
red
4. Analog TV Video
Check RF Cable
Check CVBS signal
TU100 #16 Pin
Maybe Tuner(TU400) has problems
Y
N
Y
N
Y
Maybe FI-8668(IC506) has
problems
Check Tuner 5V Power
IC701
Replace IC701
Check IIC Signal
TU400 #7, 8 Pin
Maybe Tuner(TU400) has problems
N
Y
- 15 -
5. Component Video
Check signal format
Is it supported?
Check signal
R615,R616,R617(Y,CB,CR)
Replace it.
Y
N
Check JK601
Replace connector
Y
N
Y
Maybe LGE1854C(IC100) has
problems
Y
Check Component Cable
6. RGB Video
Check signal format
Is it supported?
Check signal, Hsync, Vsync
R604,R601,R602,R631,R632
Replace it.
Y
N
Check JK605
Replace connector
Y
N
Y
Check RGB Cable
Y
Maybe LGE1854C(IC100) has
problems
- 16 -
7. AV Video
Check signal format
Is it supported?
Check signal
Rear – R612 (Composite),
R622 , R623 (S-Video)
Side – R676 (Composite),
Replace it.
Y
N
Check JK600 (Rear)
Check JK606 (SIDE)
Replace connector
Y
N
Y
Check AV Cable / S-Video Cable
Y
Maybe LGE1854C(IC100) has problems
8. HDMI Video
Check signal format
Is it supported?
Y
Check JK800
Replace connector
Y
N
Y
Check HDMI Cable
Check EDID NVRAM (IC800)
Power #8 & I2C Signal (#5, #6)
Replace it or redownload
Y
N
Check Clock Signal
R815,R816
Replace it
Y
N
Maybe LGE1854C(IC100) has
problems
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