LG MCV903 Series Service Manual

3-4
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. FLD DISPLAY PART CHECK
NO
YES
YES
YES
YES
Refer to SMPS
Troubleshooting
NO
Replace the related part
Check CN710
assembly
Check
10 PIN → - 27V
11 PIN→ 20V
12 PIN→ 25V
YES
FLT turned on
Check the power of CN710
10 11 12 PIN
YES
Check the
connecting condition
and the power of P3702
40PIN: FL- 20
39PIN: FL+ 25
38PIN: VKK-28vor higher
39PIN: 5.6V
YES
Check
IC304 PT6324
power 50 PIN VKK:-28V
9.52 PIN +5V
YES
YES
Check each pin
Check IC100 →
IC301 DATA communication
PIN PIN
27 PIN → 3PIN STB
26 PIN → 2PIN D
28 PIN → PIN CLK
OK
OK
OK
NO
Replace the related part.
NO
Replace the related part.
NO
NO
NO
If 5V is failed, check the input and
output power of D319 1SR35
IC100 IC303
27 PIN → 3PIN STB
28 PIN → 1PIN CLK
Check Data output
Check the data at both terminals
of LINE R330,331,332
YES
YES
YES
Check the related part
YES
Check the related part
OK
YES
FLD DISPLAY CHECK

LG MCV903 Series Specifications

General

Brand	LG
Model	MCV903 Series
Category	Stereo System
Language	English