System Part - LG BPM55 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

2. SYSTEM PART

Power on
LED is
Turning On
OK?
YES
2A
2B
IC501,
NO
IC601, IC602 Vcc
1.2V, 3.3VA, 3.3V, 1.5V
OK?
X501
27.000 MHz
OK ?
Replace
IC501 MPEG IC.
5.1 VA
OK?
Signal LED
OK?
Q901 OK?
Replace LED901.
3-43
NO
YES
NO
YES
NO
YES
NO
YES
NO
Replace Q901 (LED Driver).
YES
Check IC150, IC151,
IC152, IC153 and adapter.
Replace X501.
Board
Main
Check IC150 pin9.
Check IC501 & CN901.
Timer Board