Table of Contents
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System power ON ?
Yes
Back light on ?
Yes
Check U30 U31 U32 U33 U34
output voltage
(1.8V,3.3V,2.5V,105V,1.05V,1.2V,2.0
V) is correct
Yes
Keypad LED ON ?
Yes
OSD image ok ?
Yes
Input signal display
"
Yes
Audio ok
"
Yes
Function ok
Repair Flow Chart
No
1. Check wire cable connection between main board and keypad
2. Check VCC 5V in
No
Check wire cable connection between back light and power board
No
Check which one is fail?
No
1.Check IR/Lign wire cable
cable to check which one is short to cause this fail
2.
Check keypad board NG or OK
No
Check J22 LVDS cable connection
No
Check input cable
No
1
Check audio input cable connection
2
Check wire cable connection between audio board and main
No
Check main board function
BDL4785SL LCD
Audio wire cable or Sensor wire
135
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