LG MICRO Hi-Fi SYSTEM - Page 18

3-5
7. FLD DISPLAY PART CHECK
YES
YES
YES
YES
NO
Refer to SMPS
troubleshooting
F1+,F2-both terminals:over 4.4V
Check power VKK:over -32V
YES
FLT light on?
Check
P7904 1,2,3 power
YES
Check
P7904 connection
condition and power F1+,F2-
both terminals:over 4.4V
check power VKK:over 32V
check 5 pin :5.6V
YES
Check
IC301 PT6302
power 48pin VKK:-32V
57pin +5V
IC100
check→IC301
data communication
pin pin
26pin→55pin DO
28pin→54pin CLK
27pin→53pin STB
5pin→52pin RST
OK
OK
NO
Replace the related part
Check P7904 assembly
YES
YES
Check
power of each pin
OK
NO
NO
NO
NO
Replace the related part
IC100 27pin→STB
28pin→CLK
check data output
Check 26 PIN→DO→DATA input
YES
YES
Check the related part
NO
Replace the related part
When 5V fails,check D303 SR35
input and output power
YES
YES
Check the related part
OK
YES
FLD DISPLAY CHECK