Trying to repair a DSL that doesn't power on at all. I checked the fuses (f1 and 2) with a meter and they tested good. I know the battery is good. AC power socket is broken, so I can't test with AC.

I took motherboard from a known working DSL, put it in the non-working. On power up, Green light came on, both screens briefly flashed and then turned off. I put a bottom screen from a known working unit it it and it did the same thing. Haven't tried replacing the top screen.

I also took the motherboard from the broken unit, put it in a known working unit and it still did nothing. Again, the fuses tested good on it.
The flashing screens and powerdown with the good board baffles me.

I am hoping to not have to replace the motherboard.

I would appreciate any guidance or advice on possible fixes.

Originally posted by kittymat:

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if it does nothing the only other easy fix (other than a fuse) is a large component just below the power switch, this sometimes drops off if the unit is knocked. Otherwise it is a new motherboard

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Are you talking about the L2 component next to the power switch? It's there and I tested it with a meter. Checked out.
I had a suggestion to test f2 by putting a meter probe in the hole just behind the fuse in the circuit and the other probe on the farthest battery connection. When I do this on a good board, I get get good continuity. On the one I'm trying to fix I get nothing. Do you think replacing F2 would solve my problem? I also determined that the top screen is bad by putting it in a working DSL and it flashes. The bottom screen worked fine when I did this check.