Z42PT320-UC (CHASSIS:PU14K) - LG TV Service Manual (repair manual). Page 29

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Check P701 or P703
#21(RA2+) , #22(RA2-) ,
#19(RB2+) , #20(RB2-) 
Maybe Mstar has problems
Replace IC1
Check LVDS Cable for damage or 
open conductors
.
Check PDP Module 
Control board
Refer to Module CAS
Y
N
Y
Replace Cable
N
Y
Check SMPS Vs,Va, 5V,16V
Replace Power Board
N
Check 
P701/P703 : Disp_EN,
P301 : M_ON
Check GPIO Path of IC1
N
Y
Electrical Specifications
Power Supply Sequence
Input Signal Timing Specification
Control Signal Register
Check CAS
It should satisfy the 
Pixel Clock
on CAS.
No OSD
Trouble Shooting Guide
26
35.7 
28
Va OVP
24
38.5 
26
Vs OVP
22
41.7 
24
M5V OVP
20
45.5 
22
17V OVP
18
50.0 
20
5V OVP
16
55.6 
18
Va UVP
14
62.5 
16
Vs UVP
12
71.4 
14
Vs OCP
10
83.3 
12
M5V UVP
8
100.0 
10
17V UVP
6
125.0 
8
5V UVP
4
166.7 
6
PFC_DET Error
Counter 결과
Frequency(Hz)
Period(ms)
Error 종류
Check Error-Det count
Check ADJ-Remocon (IN-START)
10.Power error history
Maybe Module has problems
Replace module
Y
N
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