System Part - LG BD630N Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

3. SYSTEM PART

Power on
"HELLO"
display on LED
OK?
YES
3A
3B
IC501,
NO
IC601,IC602 Vcc
1.2VA,3.3VA,1.5V,
1.1V OK?
X501
27.000 MHz
OK ?
Replace
IC501 MT8550L BAG
5 V
OK?
VCLK,
VDATA, VSTB
OK?
IC301
data output to LED
OK?
Check CN304 or
replace LED401.
3-47
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Check IC201,IC202,IC204,
IC207 and SMPS.
Replace X501.
Board
Main
Check SMPS.
Check IC501 & CN301.
Replace IC301
(LED Driver).
Timer Board