Hi, so I am still stuck here but I have tried some different things. I have received a new CPU for the board since I was afraid that he old one was damaged (crack on the packaging). Replaced the CPU today but with the same "no beep, no boot, no code on a debug ISA card" symptoms - still with the …

I have no personal experience with programming UV erasable chips, but it seems they have to be erased prior to being flashed? https://www.youtube.com/watch?v=EghQ7YXIhm8 Yes, you are right. I have the ones without the window, okey, ebay :) thank you for your reply, at least I know now, from reading …

Hi everyone, I got myself the XGECU TL866II Pro to flash one or two bios images for my old 386 board (https://theretroweb.com/motherboards/s/gemlight-gmb-386umc). The problem is, I can read the EPROM but while trying to flash, I will always get an error. I am sure I am doing something wrong and thus …

thank you both for your answer Well the BIOS ID says it is a Dataexpert. There is a manual for the 4407 but not 4407G Ver2 : https://theretroweb.com/motherboards/s/dataexpert-exp4407 Gemlight also used those chipsets but nothing much good found yet.... Yes, the NSSI report is as well stating that …

Hi, a small update, I have swapped another CPU to the board, i486SX 25MHz and this CPU works with both VGA I have tested before and with the same that froze before. Considering the board, the 25MHz seems to be enough for it :). I am still puzzled about J16-J17 and I hope someone will address this. I …

Hi Everyone, I just got lucky and have another old piece of history at home. This time it was a full tower computer with everything including the HDD and the VGA, some Trident 512kB. The print on the board is referring to this type: https://theretroweb.com/motherboards/s/powertech-mb453 - it is pity …

Hi everyone, so, I have made it work, heh. It seems that the only issue on the board was the damaged chipset, and bent legs, and a few of them were torn away from the board. After seating the CPU there, AM486 DX40, it booted up. It seems that there is no documentation on the board - at least I …

Hi Guys, I got another board, I couldn't resist , but I can not find any manual to it and I am little bit loss with the jumper settings - I do not want to destroy it with random settings. The board has an identification saying : 4407G Ver 2.0 Unichip 486 WB, with chipset UNICHIP U4800-VLX - here the …

I looked through my older boards and some pentium and 486 had the pnp transistor chopper vrm circuit. Only found a noname board one with TIP127. I think you might be safe with it if everything else test good. thank you again! I went with the TIP117 mainly because the picture of that destroyed …

one more image, the IR scan of the board after turning on. the CPU is getting hot, some other components as well. Not sure if helpful. tomas

Hi, next to the Socket 7 board, I have found a baby AT 386 motherboard. The board was laying there for almost two decades or even longer without the battery, lucky me, but it do not post or return any beep code. During my initial inspection I have found a damage next to the BIOS, see enclosed, and …

Hello Tomas, The blown part might be a TIP117 pnp transistor. I'm not 100% sure. I have similar boards laying around so I need to check. Also it is possible that other parts in the vrm circuit got damaged too. thank you a lot for your answer. If you could check it, it would be highly appreciated. …

Hi, I have recently found an old MOBO at home and tried to resurrect it. However, the board has no post or beep signal with a known good CPU. I remember I got this board from someone that tried to OC an K6-2 and got damaged. During my inspection I have found one part, blue circle, to be destroyed. …