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.
Is this a good question?