0
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Asked
How to fix my motherboard?
Hi
Please help me repair the motherboard of my Dell Inspiron E1505 laptop. The laptop doesn't start when I push the power button.
Here it is what I tried so far:
- start it without battery in, only using power adapter
- start it without any RAM
- start it using a known good power adapter
- CMOS reset
But my laptop is dead. No beep, no LEDs, nothing.
The power adapter is putting out 19.8V.
I have the service manual, I have even the schematics of entire laptop. I opened it looking for any obvious signs of damage on the motherboard. But no luck. I checked if DC power socket is firm in place. It is.
I am quite proficient at electronics, but not too familiar with laptop repair. Perhaps somebody can tell me where to start measuring the basic voltages (3.3V, 5V, etc). I can take photos of motherboard if that will help identify strategic points for measurements.
Thank you.
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Score
John Savio
627
Answered
My next suggestion would be to clean the motherboard with isopropyl alcohol as I see there are a lot areas with rust or what seems like rust. And then once u have done that, plug in your power supply and check the voltage at the sata connector and also at the dvd connector for voltages. Also check if there is anything shorting the power supply input. Write back on what u did.
Hi, as I see from the picture (btw, awesome clarity on the pics) the dvd connector is soldered to the motherboard and there are pins from which voltages can be measured. Check this link, http://www.instructables.com/answers/50-... Same to do on the sata connector. Also trace the voltage from the input pin. Hope this helps.
Hi, what caused the laptop to be dead? Also can u pls post some pics of the motherboard near the power supply input in focus?
John Savio,
Thank you for answering, John. The power adapter central pin (data pin for that Dallas gizmo) broke and of course my battery was not charged anymore, plus the usual Dell BIOS rant (you don't have a genuine PA bla bla) popped on. I didn't care about not charging the battery, it's dead anyway, so I eventually took it out. I worked like that for a month or so, then one morning my laptop didn't boot at all. As I already said, no LEDs, no clicks, nothing. PA voltage is OK, 19.8V. I took some detail photos of the entire motherboard. I've put them at http://s1057.beta.photobucket.com/user/a... Please let me know what to do next.
Florin Georgescu,
John, please let me know if I understand it right. You want me to check for a stand-by voltage on SATA or DVD connector?? How so?
Florin Georgescu,