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6. Level 2 Circuit Board and Standard Parts Replacement
6.1. Trouble Shooting Guide
When power on fail happened, please check as following：
1. All wire cable connected correctly?
System power on?
Yes
Back light on?
Yes
Check U38、U39、U43
output voltage
(1.8V,3.3V,2.5V) is correct
Yes
Keypad LED ON?
Yes
OSD image ok?
Yes
Input signal display
Yes
Audio ok
Yes
Function ok
1. Check wire cable connection between
No
main board and keypad
2. Check VCC 5V in
1. Check wire cable connection between
No
back light and power board
Check which one is fail?
No
1. Check IR/Lign wire cable 、 Audio wire
cable or Sensor wire cable to check
No
which one is short to cause this fail
2. Check keypad board NG or OK
No
Check J24 LVDS cable connection
No
Check input cable
1、
No
2、
between audio board and main board
No
Check main board function
- 48 -
Check audio input cable connection
Check wire cable connection
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