820-3332 Backlight problem

raainxx

Member
Hi,
i have a problem with this board, liquid spill on the board, all the board clean.
Before the PPBUS_S0_LCDBKLT1 in short to GND, after i have 12,58V, the Fuse F9700 is burn, i change it, now it's good but no backlight again.
PPBUS_S0_LCDBKLT_FUSED=12,58V
PPBUS_SW_LCDBKLT_PWR=0V
LCDBKLT_EN_DIV=12,22V
I see the picture when i put a lamp on the screen.
Can you help me? what can i measure?
thanks
 

aprendiz

Moderator
wow 11.94 on Lcd_bklt_en?? Are you sure you have measured on the correct pin?? Measure pin 5 and 2 from Q9707...
 

dukefawks

Administrator
I can't give you any advice if you cannot provide correct measurements. Does it not occur to you that if there is 12V on BKLT_EN (3V logic) something must not be right.....?
 

raainxx

Member
Ok i solve the problem, with a good clean of the board with ultrasound cleaner. the BKL_EN_L fall at 0V.
PPVOUT_S0_LCDBKLT=55V
the display is burn on the board inside the screen. need to change the screen too.
 
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