Trouble Shooting - No Video Or Abnormal Image (M+S Block) - LG 42LE5400 Service Manual

10. Trouble shooting - No video or Abnormal image (M+S block)

Check mini-LVDS FFC cable
OK
Check VDD_LCM (16V)
and VCC_LCM (3.3V)
OK
Check VGH (+25V)
OK
Check VGL (-5V)
OK
Check HVDD
OK
Check VDD_ODD/VDD_EVEN/
CLK1~6 & GCLK1~6
OK
Check P-Gamma Data
OK
Check Module
Or LG5111/LGE7378A
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Only for training and service purposes
No good
Check PANEL_VCC
(IC9103)
No good
Check IC9003
(each pin, esp R9144, R9145,
R9156,R9157,R9166)
No good
Check IC9003
(each pin, esp R9129,R9130,R9131)
No good
Check IC9102
(each pin, esp R9126,R9127,R9128)
No good
Check IC9101
(Each power)
No good
OK
Check IC9100
AVDD (R9112)
Remark
Module
42 Edge
47 Edge
55 Edge
Check Q8004,Q803,Q8001
No good
And PANEL_CTRL
No good
Replace IC9003
No good
Replace IC9003
No good
Replace IC9102
No good
Replace IC9101
OK
Check output
Check P-Gamma IC
data
I2C Line
VGH (0℃) VGH (25℃)
120Hz 29.15 27.69
120Hz 29 28
120Hz N/A 28
No good
Replace
No good
Replace P-Gamma IC
(IC9100)
VGL VDD_LCM HVDD
-5 16.25 8
-5 15.5 7.7
-5.3 16.2 7.9
LGE Internal Use Only