No backlight. How to check Inverter card

[IamPritesh]

I have this compaq preasario v3000 . It now starts fine..I can see picture if I use flashlight.. and on external monitor .


I suspect it could be a case of either bad invertor or ccfl. How do I check this ? I do not have any spare invertor to swap and test....

p.S -- Togling the lid switch enables backlight for a second and then it goes back to black screen

[ktmmotocross]

Re: No backlight. How to check Inverter card

what about checking backlight enable signal?

[IamPritesh]

Re: No backlight. How to check Inverter card

what about checking backlight enable signal?

where could I find this signal ? LVDS connector ? I dont have the schematics

[mmartell]

Re: No backlight. How to check Inverter card

Pictures, pictures, pictures where are the pictures ?

[piernov]

Re: No backlight. How to check Inverter card

Usually bad CCFL. Connect any other laptop CCFL to confirm. (connect backlight connector from another laptop panel)

[ktmmotocross]

Re: No backlight. How to check Inverter card

https://cdn.badcaps-static.com/pdfs/...4c839989cb.pdf

check BRIGHTNESS_CONN