820-3330 No Bklt.

Rford

New member
Hi,

I have a 3330 with no bklt. External Screen works with screen unplugged. No history. Older machine, very faint corrosion around the board, nothing major anywhere, especially along LCDBKLT circuit.
J9000
Pins 2,3=3.3V
Pins 38,39,40 (PPVOUT_SW_LCDBKLT) reads 25V. I believe this is supposed to be 50v for the 15"
Any idea what could cause the bklt to read low?

This is a mid 2012 model.
 

2informaticos

Administrator
Staff member
Do you get image for sure (on internal LCD), just missing backlight?
PRAM reset done?
C9797/99 both OK, good solders?
Post L9701 voltage.
Do you note any change at PPVOUT_SW_LCDBKLT pressing backlight control keys?
 

Rford

New member
As it turns out, its the LCD cable... and of course this is an "up behind the LCD" model so the whole screen has to be changed out.
 
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