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LED No display on Front Control Board
LED No display on
Front Control Board
Go
Check every supply voltage on AM Board
whether normal or not.
(XS1 PIN1&PIN2&PIN3: +18V)
Yes
Check voltage +5V on main Board at XP6
PIN5&PIN6: +5V
Yes
Check the power key , source key and other
key on Board whether work normally or not
Yes
Check Front Control Board signals at XP9
Pin20:LED_SCL, Pin21:LED_SDA
Yes
Check whether bad solder exists on XP9 on
Front Control Board and U604 or LED
Yes
Replace U604 or LED
5-1
No
Refer to CON503 on Power Board
No
Check whether U6 and U7 work good
or not? And fix it or replace the AM
board.
No
Replace MCU U8 on Main Board, or
replace the Main Board
Check the XP9 ON Front Control Board,
No
signals at Pin20,21 arrive the IC U604
PIN9,10
No
Correct connection or replace the connection cable
Trouble shooting Chart
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