820-2915-A no backlight

[tipoti]

hi,

820-2915-A no backlight . i tried different screen but same problem

L9000 = 3,3 voltage
j9000 pin 40 = 25 voltage
R9704 = No voltage

u9600 Could the problem be with the u9600?

 

[2informaticos]

"j9000 pin 40 = 25 voltage
R9704 = No voltage"
Steady 25V?
Really strange to get voltage there, without LCD_BKLT_PWM present.

Do you get image on internal LCD?
External video is OK?

 

[KC Micro Tronix]

I have one of these. 25v on pin 40. Trying to figure it out. Tried a test screen. Still no back light. Has image

 

[2informaticos]

I think 15" LCD requires higher voltage.
Just in case, compare with working machine.

Tried changing U9701?