Led No Display On Front Control Board; Trouble Shooting Chart - Philips HTB3510 Service Manual

LED No display on Front Control Board

LED No display on
Front Control Board
Go
Check every supply voltage on Main Board
whether normal or not.
(XP4 PIN4&PIN5:+12V)
Yes
Check voltage +5V on main Board at XP9
PIN16: +5V
Yes
Check the power key S608, open/closed key
S612, source keyS611 and other key on
Front Board whether work normally or not
Yes
Check Front Control Board signals at XP15
Pin5 VSTB, Pin6 VSCLK, Pin7 VSDA
Yes
Yes
Check whether bad solder exists on XP15
on Front Control Board and U301 or LED
Yes
Replace U301 or LED
5-1
No
Refer to CON501 on Power Board
No
Check whether U11 and U10 work
good or not? And fix it or replace the
main board.
No
Replace MCU U8 on Main Board, or
replace the Main Board
Check the XP15 ON Front Control Board,
No
signals at Pin5, 6, 7 arrive the IC U301
PIN2,3,4
No
Correct connection

Trouble shooting Chart