LG LM-K3960A Service Manual page 14

I AUX FUNCTION
Check whether JK800
contacts or not
YES
IC200
(BU4052)4,11PI
N input waveform check
YES
IC200
(BU4052)3,13PIN output
waveform check
YES
IC801 (MC4580)
2,6PIN input waveform check
YES
normal
NO
IC200 (BU4052)16PINVDD,
8PIN VSS power check
YES
relevant parts
replacement
NO
IC801 (MC4580)4PIN
VSS,8PIN VDD power check
YES
relevant parts
replacement
- 2-7 -
NO
u-COM (IC301)83PIN,84PIN
Communication check
NO Refer to SMPS
Troubleshooting