R51 Backlight out on multiple screens

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scr71822 · #1 Post by **scr71822** » Tue Nov 03, 2009 4:14 pm

I an R51 motherboard with ATI9000 chip, video is fine at the VGA port to an external monitor and you can see the video on two different LCDs I tested both known to be good, except the backlight does not come on on either of them. Is there a fuse that would control the lighting of the backlight that can be easily replaced?

ajkula66 · #2 Post by **ajkula66** » Tue Nov 03, 2009 5:59 pm

There is a fuse, but replacing it may or may not be easy.

Also, your GPU might be failing. The fact that it displays on external monitor doesn't mean it's healthy.

Good luck.

scr71822 · #3 Post by **scr71822** » Tue Nov 03, 2009 7:28 pm

What fuse numbers would I look at first I have the diagram from this site.

ajkula66 · #4 Post by **ajkula66** » Tue Nov 03, 2009 9:37 pm

Start measuring each and every one...there are not that many of them...

Good luck.

#5 Post by **RealBlackStuff** » Tue Nov 03, 2009 10:19 pm

Find any posting of user Poshgeordie. He has a T4x fuse location diagram in his signature.
Very similar (if not the same) mobo to yours.

scr71822 · #6 Post by **scr71822** » Thu Nov 05, 2009 10:15 am

Looks like F7 fuse is blown, gonna try replacing it today.

#7 Post by **RealBlackStuff** » Thu Nov 05, 2009 5:30 pm

Solder one piggy-back-style over the old one. Much easier.

scr71822 · #8 Post by **scr71822** » Sat Nov 07, 2009 9:27 am

Replaced it and all is good now, thanks for the help!

Tõnis · #9 Post by **Tõnis** » Sat Nov 07, 2009 10:25 am

Incredible! What would cause a fuse like this to go bad? (As an electrician by trade, I'm accustomed to at least looking into the cause of why a fuse blows if it's not from an obvious short circuit or overload ...)

scr71822 · #10 Post by **scr71822** » Sun Nov 08, 2009 7:43 pm

No clue I got the computer second hand.

R51 Backlight out on multiple screens

R51 Backlight out on multiple screens

Re: R51 Backlight out on multiple screens

Re: R51 Backlight out on multiple screens

Re: R51 Backlight out on multiple screens

Re: R51 Backlight out on multiple screens

Re: R51 Backlight out on multiple screens

Re: R51 Backlight out on multiple screens

Re: R51 Backlight out on multiple screens

Re: R51 Backlight out on multiple screens

Re: R51 Backlight out on multiple screens

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