LG 42LC5DC (CHASSIS:LA65A) Service Manual ▷ View online
- 21 -
TROUBLESHOOTING
Power-Up Boot Fail Trouble Shooting
Check P1100, P1101 All
Voltage Level (19V, 12V, 6V,
3.3V)
Check Power connector
OK ?
Replace Power board
Y
N
Y
Check IC1106, IC1100 #2 Pin
Voltage Level 3.3V
Replace IC1100, IC1106
Recheck
Y
N
Check IC1110 #4 Pin
Voltage Level 2.5V
Replace IC1110
Recheck
Y
N
Check IC1105 #8 Pin
Voltage Level 1.8V
Replace IC1105
Recheck
Y
N
Check X501 Clock
19.6608MHz
Replace X501
Y
N
Replace IC600 Flash Memory
N
N
N
Check Micom IC506
Redownload or replace
- 22 -
No OSD Trouble Shooting
Check D1101 Pin #9
Voltage Level 12V
Check
Power connector
Replace Power board
Check LVDS Cable
Check PDP/LCD Module
Control board
Y
N
Y
Check FB601
Voltage Level 12V
Replace FB601
Y
N
Replace Cable
N
- 23 -
Digital TV Video Trouble Shooting
Check RF Cable
Check IIC Signal
TU101 #7, 8 Pin
Maybe Tuner(TU101) has
problems
Check LGDT1111D Output
Clock, Data, Sync
R846, R848, R849
Y
Y
N
Check Tuner 5V Power
IC1102 #3 Pin
Replace IC1102
Y
N
Y
Maybe LGDT1111D(IC803) has
problems
N
Maybe LGDT111D(IC803) has
problems
Check D805 color
Bad Tuner. Replace Tuner.
None
red
- 24 -
Analog TV Video Trouble Shooting
Check RF Cable
Check CVBS signal
TU100 #9 Pin
Maybe Tuner(TU100) has
problems
Check CVBS signal
IC503 #2 Pin
Check CVBS signal
RR534
Y
Y
N
Check Tuner 5V Power
IC1102 #3 Pin
Replace it
Y
N
Y
Replace it
N
Replace it
N
Y
Maybe FI-8668(IC506) has
problems
Click on the first or last page to see other 42LC5DC (CHASSIS:LA65A) service manuals if exist.