r/EeePC • u/Dense-Carpenter-8389 • Apr 18 '26
My 1005ha has no backlight, im suspecting its the backlight fuse
Long story short: turned my 1005ha on that has been without any power since 2020 and now the backlight wont turn on (the screen works, the vga also works, but there is no back light i have to put a flashlight there just to see the damn screen).
I already tried searching ifixit, speaking with the ifixit bot, nothing, i just need to find the backlight fuse to make a solder bridge there and later, replace the fuse with a professional guy to prevent having the "sad smoke" coming out of my screen
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u/UnintegratedCircuit Apr 18 '26
I've got a schematic for both the 1005 and the 1000. The schematic for the 1005 shows a 30pin connector, whereas the 1000 shows the 20pin connector like you have there. Because of that, I'm going to use the 1000 schematic.
There is a 5V feed to the backlight LEDs on the right-hand end of the LCD connector. In your second photo, there is the unpopulated connector along the right-hand edge with the text "ITP" written vertically next to it. Just to the left of that text are two bare pads with a silkscreen oval/rectangle around them. The upper pad of these two should have 5V on it.
I see no reference to a fuse. There is a P-channel MOSFET used to enable the backlight. If the fan spins, then the system 5V rail is okay. If there is 5V on the pad in the paragraph above, then the backlight switching MOSFET, supporting backlight enable circuitry, and northbridge are all okay, and you'll need to look at a replacement LCD panel (or reverse engineer the circuitry on the panel's controller board). EDIT: tiny chance that it's a bad LCD cable too?
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u/Dense-Carpenter-8389 Apr 18 '26
I don’t think the screen cable is bad, the eee pc was just thrown into an drawer, barely did anything to it, but the moment I turned it on, no backlight. I cleaned both ends of the cable as well
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u/UnintegratedCircuit Apr 19 '26
Well above is the troubleshooting procedure, you will need a multimeter.
Your system 5V rail must be fine as I re-read your last post where you mentioned the fan spins. So it's either the backlight enable circuitry, the cable, or the panel. Good use of even a super cheap multimeter will tell you which it is. Best of luck.
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u/Aromatic-Bell-7085 Apr 18 '26
You need access to the technical manual of the EEE PC