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HD7790 BIOS IC Location

post #1 of 4
Thread Starter 
I'm having some trouble with my Sapphire HD7790 Dual-X OC, after a BIOS flash the GPU won't POST anymore, I've already tried booting through my GT240 and flashing the BIOS back but the system won't POST because of the GPU. The system works fine with the card removed.
I've already attempted a Blind Flash that failed to work after leaving it for around 2 hours, and I've read a few articles about people with similar problems shorting specific pins on the BIOS chip (pin 1 to pin 8 or pin 3 to pin8 ect.) to allowing the faulty card to boot so they could use a secondary GPU to flash the BIOS back to the faulty card.

I've been looking and there are 5 IC's on the PCB anyone of them could be the BIOS chip but I'm having a hard time identifying them as the serial numbers on the chips don't turn up anything useful on Google or any Datasheet websites I've tried.
I'd be grateful for any assistance on where the bloody thing is an which pins need shorting, or a datasheet I could use.


PCB Rear
PCB Front

1. 1587
PMXZ
Low Voltage Buck Controller

2.APW7165C
A0A3T
PWM Chip

3.NKS
GS7103
R0G7GA02T
Linear Regulator

4.25Q10T
CDAH1D
CH1304
The 25Q10 is listed as 24-pin Universal Logic Array according the AMD datasheet linked. No mention of the 25Q10T though.

5.NKS
PD1503YVS
UNE200413
Enhancement Mode MOSFET


After some more sifting through the various irrelevant pages on Google & Bing I've ruled out all the IC except the 25Q10T as it is the only chip I could not find any useful info on.

Considering the 25Q10 is a CMOS Logic Array I'd conclude that the 25Q10T is part of the same family (a revised and condensed IC) although without the specific pin-outs of the IC I cannot accurately gauge which pins do what.
Edited by Goldn3agle - 10/19/13 at 7:51am
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post #2 of 4
Thread Starter 
I got tired of waiting and decided to try out shorting pin1 and pin8 (which seemed most common in the other threads) this allowed me to boot through my GT240 and access AtiWinFlash, I flashed the original BIOS back on Adapter 0 (I thought it would have been 1 but it wasn't maybe because the NVIDIA card isn't detected) and now everything is back to normal.

Fur future reference the BIOS IC was listed as GD25Q10TCP with 25Q10T stamped on the IC itself.
Edited by Goldn3agle - 10/19/13 at 7:53am
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post #3 of 4
Heartiest congrats, phew! thumb.gif
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post #4 of 4
Thread Starter 
Thanks tongue.gif
Most people around the various forums said that it was nearly impossible to brick a GPU from a bad BIOS flash so I guess they were right biggrin.gif
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