LG 50PT350 Service Manual page 40

Repair Process-Reference data
Input
PDP TV
Block
Make sure you can't hear any audio
Y
Check speaker for damage.
Y
Check Connector
P301
Y
Check IC303 Power
17V(C340), 3.3V(R365,R374)
Y
Check IC700 Status
PDN(#23) / Reset(#31) is High?
Y
Check SCL,SDA
R359, R360
Y
Check Mstar I2S Output
#27,28, 29, 30 on IC303
Y
Replace AMP(IC303)
All Input Audio Problem
N
Replace the Speaker
N
Replace P301
N
Check 17V (P600 #1,2),
3.3V (IC606 #2)
N Check
Reset (R380) / PDN (R374)
:They must be High (3.3V)
N
Replace R359, R360
N
Replace MSTAR(IC400).
Making 2010. 11. 16
Revision
ⓒ LG Electronics. Inc.2010
전자 - 6-2
A2-1