Gateway NV59C09U No backlight LED

[Reech]

Motherboard: NEW90 L21
I can faintly see image on the display with flashlight but screen has no brightness at all. Laptop was dropped; replaced the power jack and LED display cable. Both were damaged and the left hinge was snapped off and flopping around. The LED cable must have shorted something since the display was working prior to the repairs.
The 2 fuses on back of the LED display check good.
I could not locate any other fuses on the motherboard.

[selldoor]

Re: Gateway NV59C09U No backlight LED

You are going to have to post good clear photos of both sides of the boards.
Dropping - if it was on at the time could have displaced graphics chip?

Have you tried it with an external display?

[Reech]

Re: Gateway NV59C09U No backlight LED

Wore ground strap for all motherboard touching.
Battery was removed, etc when I replaced the cables.
I'll try to get clear pics of the mobo, both sides.
Thanks

[selldoor]

Re: Gateway NV59C09U No backlight LED

OK - but have you tried it with an external display - monitor /tv

[Reech]

Re: Gateway NV59C09U No backlight LED

Yes, no problem with external display.
I am attaching two pics of the mobo.
Thanks

[selldoor]

Re: Gateway NV59C09U No backlight LED

IMPORTANT These pics look to be taken on an antistatic bag?
and the cmos battery is in?

Antistatic bags are slightly conductive and can short out sensitive components.

[Reech]

Motherboard: NEW90 L21 No backlight LED

I had a second post which had the motherbord model above that was flagged as a duplicate. On Friday 1/24/14 I checked it at work and there were several replies.
When I got home from work that "post" had been removed along with the replies that I was going to try and repair the mobo with.
How can I get this back?

Thank you

[trebo]

Re: Motherboard: NEW90 L21 No backlight LED

I had a second post which had the motherbord model above that was flagged as a duplicate. On Friday 1/24/14 I checked it at work and there were several replies.
When I got home from work that "post" had been removed along with the replies that I was going to try and repair the mobo with.
How can I get this back?

Thank you

it is still there, here is link, https://www.badcaps.net/forum/showth...618#post412618

[dj_ricoh]

Re: Gateway NV59C09U No backlight LED

get some sharp probes and write down the voltage from LCD connector!
1=
2=
.
.
40=

[Reech]

Re: Gateway NV59C09U No backlight LED

Wow, those contacts are way too tiny for my meter, I can't even try it.
Don't want to fry the mobo!
Anyone have a tip on checking voltage at the led backlight?

[Reech]

Re: Gateway NV59C09U No backlight LED

Does anyone know where I can check for the LED backlight voltage at both the motherboard and the display so I can trace the problem to one of these components.

[spidey]

Re: Gateway NV59C09U No backlight LED

first we need schematic to say that. what is the mobo code ?

[Reech]

Re: Gateway NV59C09U No backlight LED

Spidey, I have a duplicate post (I have left note to use this one) that has the schematic https://www.badcaps.net/forum/showthr...618#post412618
See Khaank's response 1/21/14. Mobo is: New90 L21.

[spidey]

Re: Gateway NV59C09U No backlight LED

when i click the link, what i see is a dog smoking cigarette.

[spidey]

Re: Gateway NV59C09U No backlight LED

check page 22, LCD panel conn. pins 1,2,3 - 8 and 9

[Reech]

Re: Gateway NV59C09U No backlight LED

Spidey, Thanks I'll check this out tonight!
The other link is in a response from trebo dated 1/25/14.

[Reech]

Re: Gateway NV59C09U No backlight LED

I just tried another working display and I get the same result, no backlight but I can faintly see images on screen.

[Reech]

Re: Gateway NV59C09U No backlight LED

Tried again last night, the orig. display works fine on a known good laptop.
The known good display has the same no backlight on the problem laptop.
So problem is with the motherboard.
If anyone has any idea of a fuse or something on the mobo, this one is toast!

Thanks to everybody that responded, your help is much appreciated.

[dj_ricoh]

Re: Gateway NV59C09U No backlight LED

look if i must say it and nobody will say it i will!!!
do you even understand what we ask?
you need to post what voltage you got on the connector(cable that goes to LCD)

if you don`t understand or don`t know something just say it, that`s why this forum exist.
the best place where you learn.

[spidey]

Re: Gateway NV59C09U No backlight LED

and i already told you what pins to check....