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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.
(XP33 PIN3:+12V, PIN5&6: +5V)
Yes
Check voltage +5V, +12V on Power Board
at CN502 position and Front Control Board
(XP3
PIN14:+5V
PIN7:+3.3V)
Yes
Check the power key(S608), open/closed
key(S611), source key(S609) Front Control
Board whether work normally or not
Yes
Check
Front
SCL,SDA
(XP3 PIN11: SCL PIN10:SDA)
Yes
Check whether bad solder exists on Front
Control Board of XP3 and LED
Yes
Replace U301 or LED
PIN13:+5V
Control
Board
signals
5-1
No
Refer to CN502 on Power Board
No
Fix the connection XP3 on Front
Control Board
Board
No
Replace U301 on Front Control Board,
or replace the Front Control Board
No
Check the U301 ON Front Control Board
pin 4 3 arrive the condition XP3 PIN11
PIN10
No
Correct connection
Trouble shooting Chart
and
XP33 on Main
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