DIL bios chip backward-reverse, I have damaged my mainboard?
 

Yesterday I tried to replace my mainboard bios with a coreboot image.
Was the first time for me inserting the chip, and..I insert in wrong side.
This is correct side

https://www.biosflash.com/images/dil_socket_kreise.jpg

I put the part with the green circle in the other side!

Of course the motherboard don't start I can only turn on and off (no bios splashscreen, no video output)
But bios in the programmer can be erased and saved (and re-write)
My question is: is possible my motherboard or the cpu is damaged?

LOL...

Nice

Best case scenario is you just damaged the BIOS chip and you need to replace it a new one. Worst case is it damaged the motherboard.

:)

Try this

https://www.biosflash.com/e/bios-chi...on-removal.htm

I hope is the chip, but is possible that a damaged chip can be read and write by a usb programmer and don't work on motherboard socket?

Socketed E²Prom chips are pin-compatible with Eprom. So, as an ex-hardware guy, I can tell you you have performed the Frankenstein trick of reversing the polarities. You put the negative lead to +, and vice-versa.

Most of the other leads don't matter. Inherent in each FET is a reverse diode. So all those reverse diodes were forward biased and conducted a high current Your only protection is that they did this together. You'll have to see what survived. Here's a few guesses

• Eproms often survived that. They're tough by standards. E²Proms die 90% of the time.
• The + or - track from the socket could be blown if the tracks are not thick.
• If any other pin passed significant current (possible) your motherboard is a write-off.
• You may have blown your power supply.

Here you see the difference between an expensive & cheap psu. There is a trick called 'Fold-back current limiting.' Let's say you have 20 Amps available on your 5V line. When an over-current is detected, fold-back limiting will not continue to pump out >20A, but 'fold back' to a lower figure of ≅ 8-12A.

If you have or can borrow another Programmed BIOS in a chip of the same size, ideally from a blown m/b, you might insert it and turn on the machine. ASCII on the monitor would be a sign of life in the m/b.

You will probably need to replace the BIOS chip anyhow. Switch on the motherboard with everything on, and monitor heat on parts that shouldn't get hot. If they do, goodbye motherboard. Allow a few minutes. Parts may get lukewarm, but no more. If they keep getting hotter, say goodbye.

Today new bios arrived, installed it and works fine.
This time I was lucky.

Did any of the wheezes I suggested yield any information?

Not needed, I was lucky the mainboard was not damaged. Anyway thanks for help.