LG BPM54N Service Manual page 61

ELECTRICAL TROUBLESHOOTING GUIDE
4A
"LG Logo"
display on monitor
OK?
YES
"LG Logo"
display on monitor
OK?
YES
System part OK
IC501,
NO
Vcc 1.2V,3.3V,1,1V,
1.5V OK?
IC601,
IC602 Vcc
1.5V OK?
X501
27.000 MHz
OK?
Signal
NF_ALE, NF_CLE
OK?
Replace IC501 MT8560
or IC601, IC602.
Display
NO
cable connection
OK?
4B
3-48
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Check IC150,IC151,
IC152,IC153 and SMPS.
Check IC150
and SMPS.
Replace X501.
Replace IC603
(NAND flash).
Proper display
cable connect.