keys do not work
keys do not work
Go
Check voltage +5V on Front Board U301
PIN7、PIN21
Yes
Check Front Control Board signals at XP3
Pin8 VSCLK, Pin7 VSDA,Pin6 VSTB
Yes
Replace U301 on Front Board
5-2
No
Fix the connection XP3 to XP9 on Main
Board
No
Replace U8 on Main Board, or
replace Main Board
Trouble shooting Chart