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Dead motherboard

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5 replies

by pankur

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I have an old motherboard, that can use either a
slot 1 CPU or a PGA370 CPU.
The board had a Pentium 750 MHz and was working fine.
I wanted to test a PGA 370 CPU a Pentium 700 Mhz
and according to the manual the only thing that I
had to change was a jumper from 1-2 to 2-3, which I did.

When I put on the power,Iheard a pop and the board went dead.

Both CPU's worked with PC 100 sdrams,
and the memory was not changed.

The slot 1 CPU has 1 1.65V, the PGA 370 has a 1.7v

Why would a change in CPI damage the board.

Thanks

5 replies

by cmiller5400

Whoops!!! Anything is possible. If the CPU itself was bad it could possibly short out the board. Can you tell what "poped" on the board? Is there any burn marks? Was the CPU a known good one? I once saw a processor that was in 3 pieces because it was put in backwards by accident before they were pinned to go only one way. It litteraly blew up when the power was applied!

by mjd420nova

I love the smell of burned resistors in the
morning. It's probably a bad capacitor. Inspect
the MOBO for any wet spots, or black steaks near
any devices. Check around the power supply
connections for burned traces. Capacitors
will short and blow themselves off the board.
Look for loose items in the case. Look at the
top of each chip, when they blow it will create
a crater in the plastic. Be sure you monitor the
1.65 volts when you power on the next time,
the power supply could burn up a bunch of stuff
before you catch the real cause.

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