EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: HackedFridgeMagnet on May 21, 2015, 07:15:47 am
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My sons Acer Aspire e1-570 is missing the backlight. 3 months out of warranty.
HDMI out is good, screen shows up with a torch shined on it.
I took a punt and replaced the screen but the problem is still the same.
I am guessing the power supply for the backlight, which I guess is on the motherboard.
Has anyone got any info/ schematics, especially the 30 pin connector pinout?
the 30 pin connector looks like this
http://www.amazon.co.uk/ACER-ASPIRE-E1-570-REPLACEMENT-SCREEN/dp/B00K88IBEG (http://www.amazon.co.uk/ACER-ASPIRE-E1-570-REPLACEMENT-SCREEN/dp/B00K88IBEG)
Also could it be some power monitoring setting?
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I took a punt and replaced the screen but the problem is still the same.
:palm:
http://kythuatphancung.vn/uploads/download/9f125_Compal_LA-9535P.pdf (http://kythuatphancung.vn/uploads/download/9f125_Compal_LA-9535P.pdf)
backlight usually doesnt die without a reason, Im guessing liquid damage on the motherboard = eroded connections under lcd connector, backlight fuse or backlight boost converter chip & its passives.
You will need to take pcb out. Start by inspecting for moisture signs, pink/red copper pads, grey residue on solder joints, or even missing smd parts. Use magnifying glass/microscope and continuity tester. If you cant find anything then next step is connecting everything outside case and measuring voltages.
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Check around the lcd connector, I have already repaired many that had a failed mosfet, its easy to spot it, its always a big-ish cooper flood around 2-4 pins of the lcd connector and should have 18-19v when the laptop is connected to the charger.
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Thanks for the schematic that is great!
Liquid on pcb sounds plausible for a kid. Or me for that matter.
:palm:
Ok ok noob mistake.