LG LHB976 Service Manual page 118

MAIN SET TROUBLESHOOTING
A
Menu "Home" display
on monitor OK?
YES
"LG Logo"
display on monitor
OK?
YES
System part OK.
NO
1.2 V/ 1.5 V/
3.3 V OK?
Reset &
UART RX,TX
OK?
X501
27.00 MHz
OK?
IC506
NF_ALE, NF_CLE
OK?
Replace IC500 BCM7632
or IC502, IC503 (DDR3).
B
Proper
NO
assemble MAIN
and FRONT board
OK?
2-103
NO
Check IC150, IC151, IC153
YES
NO
YES
NO
YES
NO
YES
YES
NO
and SMPS board.
Check X101 and IC101.
Replace X501.
Replace IC506
(Nand Flash).
Assemble properly.