LG BPM55 - System Part

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