Front Part - LG XV-BD212 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

3. FRONT PART

Power on
"WELCOME
PLEASE WAIT" Display
on VFD ok?
YES
Volume LED
(LD301 ~ LD306)
turn on?
YES
When you turn
the volume knob, count
is change?
YES
FRONT board ok
NO
CN301 cable
connection ok?
YES
CN301 pin3, 4, 5
power ok?
YES
CN301 pin6, 7, 8
data signal ok?
YES
IC301
check ok?
YES
Digitron (DIS301) ok?
NO
CN301 pin11, 12
+5 V ok?
YES
Replace LED. (LD301 ~ LD306)
NO
CN301 pin20, 21
signal ok?
YES
Check MAIN board
2-50
NO
Connect 24p FFC cable
NO
Check SMPS board
NO
Check MAIN board
NO
Replace IC301
NO
Replace DIS301
NO
Check SMPS board
NO
Replace VOL301.