How to fix my motherboard?
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.
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.