Repair Radeon hd 5770  - Page 1
Forum section: electronics / repair

author: more_stars
author_rank: Regular Contributor
timestamp: April 11, 2020, 07:57:51 pm
content: I know this is an old gpu but I really want to find what is wrong with it.The card is not outputting any video and it makes the computer restart after every 5-8 secconds. The fan is working correctly as if I let the card in the pc for a longer period and if it starts to worm up, the fan will also start to speed up.The ram chips and the main gpu starts to worm up pretty quickly after approximately one minute.

author: M0HZH
author_rank: Regular Contributor
timestamp: April 11, 2020, 09:02:56 pm
content: If you are sure the computer's power supply can handle the load, best bet would be either a corrupted BIOS or power supply issue.Does the computer boot with the HD5770 and another video card plugged in at the same time ?Vgpu should be between 0.950V and 1.125V depending on state, Vdd & Vddq are 1.5V, can you measure ?

author: more_stars
author_rank: Regular Contributor
timestamp: April 12, 2020, 08:01:32 am
content: After some checks, I was able to see that the vrm voltages are:Vcore vrm 1.22vVmem vrm 1.5vAux vrm 1.1vAre those one ok? Also, this time, the pc did not restart but also did not boot. My psu is 530w so it should be fine.

author: M0HZH
author_rank: Regular Contributor
timestamp: April 12, 2020, 08:35:49 am
content: Is it a special overclocked model or stock AMD/ATI design ?If you can boot with another card as the main graphics and the HD5770 as a secondary, you might be able to reflash the BIOS using ATIflash or another similar tool in a hope to get it working.If you can't boot with another card plugged in, identify the flash IC (usually 8-pin chip at the back of the GPU), get an identical one, flash it with a fresh copy of the BIOS (make sure it's the exact model, or use the stock ATI one if you can't find it), replace the one on the card and cross fingers. You will need some sort of SPI flash programming interface, you can make one with an Arduino.(The next generation (HD6xxx) got a dual BIOS feature where two copies of the BIOS were stored onboard and you could select which one to use for boot with a switch.)If that doesn't work, completely remove heatsink and put the board inside the oven at 200C for 7 minutes then let it cool off for 15 minutes, reassemble and give it another shot.If that doesn't work either, there isn't much that can be done.Cheers,Razvan.

author: more_stars
author_rank: Regular Contributor
timestamp: April 12, 2020, 09:06:06 am
content: Razvan, thank you for all the felp here. I will try to reflash the bios using an Arduino and I will come back with the resultsThe card is a sapphire vapor-x radeon hd5770Again, thank you so much for your help.Regards Alex

author: Electro Detective
author_rank: Super Contributor
timestamp: April 12, 2020, 09:07:53 am
content: If all else fails, pull the video card out of its socket, and with a torch light and magnifier, check that the socket pins on the motherboard are uniform/straightand not dusty or crusty, or bent or damagedCheck the video card contacts are clean shiny with no leaky or bad caps on itAnother known working card can also verify if it's the computer at fault, dud drivers or a BIOS issueGood luck hunting down the problem

author: more_stars
author_rank: Regular Contributor
timestamp: April 13, 2020, 05:16:57 pm
content: Today I was able to find a video card that had the same bios chip and so, I just removed that and replaced with my HD 5770 card and now, I can power the computer and will boot normally but with no video.The next step is to use the on board graphics and try flashing the right bios on this card.I will let you guys know what the results are.