LG BD370 - System Part

3-33
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Only for training and service purposes
LGE Internal Use Only
POWER on
Main Board
Timer Board
Check SMPS
“HELLO
PLEASE WAIT”
Display on VFD
OK?
CN501,
Pin18:+5.3VA, Pin3:-29VA,
Pin17: -27V, Pin13:
-24V?
NO
NO
YES
YES
YES
X501 Change
X501 10MHz
OK?
NO
YES
IC501 Change
R516
About 625kHz Serial
Clock OK?
NO
YES
IC502 Change
R523
about 500kHz
OK?
NO
YES
DIG501 Change
Check SMPS
“READING”
Display on VFD
OK?
CN701,
Pin5: 12V, Pin7:5V,
Pin2:2.2V, Pin11:
5.3VA?
YES
IC202, IC203,
IC204 Change
CA207: 5.3VA,
CA210: 1.2V
CA211 : 5V
NO
NO
YES
X301 Change
X301 : 27MHz
OK?
NO
X102 Change
X302 : 25MHz
OK?
NO
YES
YES
Check IC301
System part OK
3. SYSTEM PART
ELECTRICAL TROUBLESHOOTING GUIDE