LG LX-D2560A Service Manual page 21

I TUNER FUNCTION CHECK
Check TUNER
module(TU601) is working.
YES
Check IC200(BU4052)
1, 12PIN input waveform.
YES
Check IC200(BU4052)
3,13PIN output waveform.
Check IC601(BU 4502)
2, 15PIN Check 25 PIN:5.6V
YES
Check IC801(MC4580)
2,6PIN input waveform.
YES
OK
I TAPE FUNCTION CHECK
TAPE PCB ASS`Y
YES
Check IC200(BU4052)2,1
5PIN input waveform.
YES
Check IC200 (BU4052)
3,13PIN output waveform.
Check IC601 (BU4052)
2,15PIN input waveform.
YES
Check IC801 (MC4580)
2,6PIN input waveform.
YES
OK
NO
Check TUNER MODUEL
power(Check 2PIN 9V)
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
NO
Check IC200 (BU4052)
16PINVDD,8PIN VSS power.
YES
Replace the related parts
NO
IC200(BU4052) 16PIN-
VDD,8PIN VSS power check
YES
Replace the related parts
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