Philips HTB3510/12 Service Manual page 24

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Check voltage +5V on Front Board U135
PIN7&PIN21
Yes
Check Front Control Board signals at XP15
Pin5 VSTB, Pin6 VSCLK, Pin7 VSDA
Yes
Replace U301 on Front Board
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5-2
No
Fix the connection XP15 to XP9 on Main
Board
No
Replace U8 on Main Board, or
replace Main Board
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