820-000165 no backlight

Kyle93

Active member
820-00165 had mild water damage, replaced U7701 D7701 C7706 C7797 C7799 Q7707 and Q7706. Turns on and chimes and have image but no backlight.

F7700 8.6V on pin 1 and 2

L7701 8.6v

Q7706 pin 3 2.8V

Q7707 pin 3 0V

r7789 147K

what to check next??
 

2informaticos

Administrator
Staff member
Check integrity of feedback trace from D7701 to U7701.
Pay atention to (in)famous XW7720 bridge; just between L/D7701, on the board.
Post power and control voltages for U7701.
 

Kyle93

Active member
Feedback trace was blown. Have backlight now but section of the screen is white, see picture. Is this a screen or board issue?
 

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