5-2 Trouble shooting Chart
keys do not work
keys do not work
Go
No
Fix the connection XP15 to XP9 on Main
Board
Yes
Replace U8 on Main Board, or
replace Main Board
No
Yes
Replace U301 on Front Board
Check v5V on Front Board U135
PIN7&PIN21
Check Front Control Board signals at XP15
Pin5 VSTB, Pin6 VSCLK, Pin7 VSDA
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