LG 42LG350H (CHASSIS:LD85F) Service Manual ▷ View online
- 17 -
Check the input source.
Same as Block A.
No
Check the IC700.
No
Yes
Is video input
of the RGB Jack normal?
(Check JK703_Pin1,
2,3,13,14)
No
Is waveform
of Switching IC normal?
(Check IC700_Pin11,
12,13)
7. Unusual display from RGB mode
Check the input source.
Same as Block A.
No
Check the IC900, IC901.
No
Check the IC902.
No
Check the IC902.
No
Yes
Is video
input of the HDMI
jack normal? (Check
JK900,901)
Yes
Check DDC
communication
lines(IC900,901_
Pin5,6
Yes
Check HDCP
communication lines
(IC902)
No
Is waveform
of Switching IC normal?
(Check IC902)
8. Unusual display from HDMI 1/2 mode
- 18 -
Yes
No
Set on speaker on menu.
Download the EDID data.
Check the Tuner in/Out.
No
Check th Speaker cable.
No
Replace IC100.
No
Replace IC1000.
Replace main board.
No
Yes
No
No
All input is no sound?
Only HDMI is
no Sound?
Only RF or DTV
is no sound?
Is the speaker
“on” on menu?
Is the Speaker
cable normal?
9. No Sound
(1) Symptom
1) LED is blue
2) Screen display but sound is not output.
2) Screen display but sound is not output.
(2) Check process
Yes
IC100 operate
normally?
Yes
IC1000 operate
normally?
Yes
Yes
- 19 -
Check the input source.
Check the speaker wire.
No
Re-solder or replace the IC100.
No
Re-solder or replace the IC2001.
No
Replace the external speaker
No
Yes
Check the input
source?
Yes
IC100 operate
normally?
Yes
IC2001 operate
normally?
No
Check the external
speaker
10. Don’t operate the external speaker out
- 20 -
Check the RS-232C Pin7(5V_OUT).
Check the RS232C Pin9(12V_OUT).
Check the RS232C Pin9(12V_OUT).
Set “YES” on SVC menu.
No
Re-solder or replace the defect part.
No
Re-solder or replace the defect part.
No
Yes
Is the 5V or 12V Out
“YES” on SVC menu?
Yes
Check the
on/off control of IC100
R160:5V
R142:12V
No
Check the operation
of Q1205.
11. Don’t operate 5V out or 12V out
Check the RS-232C Pin4.
Replace the Preamp of IR ass’y.
No
Re-solder or replace the defect part.
No
Yes
Check the IR waveform
of L403.
No
Check the IR waveform
of IC1304_Pin3.
12. Don’t operate IR out
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