4-3
3. IC103 KS4CD21CS CHECK
4. FLD DISPLAY CHECK
Check IC100 78KOKF2
22,24 PIN
22 PIN DATA 22 PIN CLK
Check MICOM power 5V
Refer to MICOM
Troubleshooting
Replace the related parts
Check the related part
OK
Refer to SMPS
Troubleshooting
Check P7302 assembly
Check power of each PIN
OK
Replace the related part
OK
Check P7904 1,2,3 power.
F1+,F2- both terminals: over
3.7V Check power VKK: over
-28V.
Check P7302 connection
condition and power F1+,F2-
both terminals: over 3.7V
Check power VKK: over -28V
Check 25 PIN:5.6V
Check IC301 PT6324
power 50 PIN VKK: -28V
9.52 PIN +5V
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only