Micom Failure - Samsung PN22N Series Service Manual

5 Troubleshooting

5-1-17 Micom Failure

+5VS line is right?
Yes
IC101 Pin 15 and 16
38 39
inputs are right?
Yes
IC201 Pin 18 input is right?
Yes
All in/output values are right?
Yes
Done
5-1-18 Sub-Micom Failure
+5VS line is right?
Yes
ICS201 Pin 14 is right?
10
Yes
All in/optput values are right?
Yes
Done
5-10
No
Check ICS204.
No
Check X201, C204 and C205.
No
Check IC202.
No
Replace IC201.
No
Check ICS204.
No
Check X201, CS205 and CS206.
No
Replace ICS201.
WAVEFORMS
IC101 #16
38
CH1 RMS = 1.644V
39 IC101 #15
CH1 RMS = 1.94mV
WAVEFORMS
10 ICS201, #14
CH1 RMS = 2.904 V
PN22N*