LG 37LG300C (CHASSIS:LD85A) 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)
8. Unusual display from RGB mode
7. Unusual display from Component mode
Yes
No
Same as Block A.
Is video input
of the Component Jack
normal?(Check R733,
734,735)
Check the input source.
- 18 -
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)
9. Unusual display from HDMI 1/2 mode
- 19 -
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?
10. 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
- 20 -
Check the input source.
Check the speaker wire.
No
Re-solder or replace the IC100.
No
Re-solder or replace the IC1001.
No
Replace the external speaker
No
Yes
Check the input
source?
Yes
IC100 operate
normally?
Yes
IC1001 operate
normally?
No
Check the external
speaker
11. Don’t operate the external speaker out
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