LG LX-D2560A Service Manual page 20

I AUX FUNCTION
Check if JK800 contacts with
YES
Check IC200 (BU4052)
4, 11PIN input waveform.
YES
Check IC200 (BU4052)
3, 13PIN output waveform.
YES
Check IC801 (MC4580)
2, 6PIN input waveform.
YES
OK
NO
Check IC200 (BU4052)
16PIN VDD, 8PIN VSS power.
YES
Replace the related parts
NO
Check IC801 (MC4580)4PIN
VSS, 8PIN VDD power.
YES
Replace the related parts.
- 3-7 -
NO
Check u-COM (IC301)
83PIN, 84PIN
communication.
Refer to SMPS
NO
Troubleshooting.