System Part - LG BP540N Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

4. SYSTEM PART

Power on
"HELLO"
display on LED
OK?
YES
4A
4B
IC501,
NO
IC601,IC602 Vcc
1.2VA,3.3VA,1.5V,
1.1V OK?
X501
27.000 MHz
OK ?
Replace
IC501 MT8560.
5 V
OK?
VCLK,
VDATA, VSTB
OK?
IC901
data output to LED
OK?
Replace LED901.
3-47
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Check IC150,IC151,
IC152,IC153 and SMPS.
Replace X501.
Board
Main
Check SMPS.
Check IC501 & CN901.
Replace IC901
(LED driver).
Timer Board