Thank you but i have watched many videos. 😉
I can boot using my test motherboard with this GPU as a secondary one. MATS indicates an issue with memory banks A0 and B1. I will reball the chips as a first step.
pastapoulos
Member
Last Activity: 01-24-2025, 06:54 AM
Joined: 08-02-2024
Location: FRANCE
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Hello, the only thing I notice is the absence of NVDD_EN on the U812 circuit. According to a YouTube video by Northwestrepair, this signal is generated by the circuit itself. When I measure the signal on pin 36 and power up the board, it ends up being short-circuited. In this video, they recommend desoldering a dual NPN to force the signal and then powering the GPU with a DIY power supply to look for a MOSFET issue using a thermal camera.
Do you think this is a viable solution? I have a lab power supply; could I potentially diagnose the issue by injecting voltage? What would you advise?...Leave a comment:
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When you say measure the coils of the vcore supply, you say resistance to ground ? Resistance is very low about 1 ohm.
I have 5v on VCC of the controllerLeave a comment:
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Finally, the 3.3V is indeed present. It was probably a measurement error. I took several measurements again. There is an issue with the vcore power supply, but I don't know where to look.
[URL=filedata/fetch?filedataid=363517][ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3520716}[/ATTACH][/URL]
[URL=filedata/fetch?id=3520712&d=1733246443][ATTACH=JSON]{"alt":"Click image for larger version Name:\tzotac-rtx-3080-trinity-10gb-not-detected-v0-c5r86dklc24e1.jpeg?width=5084&format=pjpg&auto=webp&s=16d1c684fc8cc0b1cc0e70a441e1ee4585132e1d.jpg...Leave a comment:
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Finally, I’m facing an issue with the 3.3V line. When measuring the 3.3V pin in diode mode, it indicates an open line. I also measured pins 1 and 3 of the PEX_RST component, and I’m only getting 1V instead of the expected 3.3V. How can I identify which component is causing this issue without access to the schematics?Leave a comment:
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So wrong way, PEX is present I got 1.8v on pin 4&5 u501 then 3.3v on pins 1&2
any idea ?...Leave a comment:
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Do you think it can be an issue with PEX like in this post [url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-desktop-motherboards-graphics-cards-and-pc-peripherals/91220-rtx3070-not-detected-no-display-has-all-voltages-and-pex-reset-question[/url] ?
I'don't have a riser for testing in good condition so i will buy one and see if there is an issue with the pex_resethttps://Do you think it can be an is...question[/url]Leave a comment:
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EDIT:
Photo with more voltage values
[ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3512888}[/ATTACH]...Leave a comment:
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Repairing GIGABYTE RTX 3070 TI GAMING OC 8GB Rev.1.0
Hi everyone,
I picked up this non-working graphics card with the intent of repairing it. I don't know the details of its failure, but the card is in near-perfect cosmetic condition. It had never been opened before I started working on it.
During my inspection, I didn't spot any obvious physical damage. However, when testing, I discovered the PCIe 12V line was open. I replaced the blown fuse and rechecked the measurements—no short circuits on the main lines.
When I tested the card in a system, it prevented the PC from booting. I checked the main voltages,... -
Thank you very much, I will continue my investigations.
Leave a comment:
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Trying to fix ZOTAC RTX 3080
[B]Hi guys,[/B]
I bought a broken GPU that I'm trying to fix. The card powers on but isn't detected by the motherboard.
The card is a [B]ZOTAC RTX 3080 Trinity OC 10GB[/B]. I can't find any schematics for this model, so it's a bit challenging for me to diagnose it with my limited knowledge.
I haven't found any shorts, and the resistance measurements seem normal.
Upon visual inspection, I noticed an inductor with a small crack (see photos), but I'm not sure if it could be the cause of the issue. Do you think I should replace it? Does anyone have... -
Watch Withings Scanwatch 2 (XNAHWA09) / No power
Hy guys,
This is my first post here 😁
I've got my hands on a broken Scanwatch 2 (XNAHWA09) that I'd like to fix. The watch won't turn on.
After removing the battery and connecting the watch to an external power source, I noticed that the watch was turning on sporadically.
Upon visual inspection, I haven't found anything obvious except for this inductor, but maybe that's normal .
[URL=filedata/fetch?id=3460863&d=1726257959][ATTACH=JSON]{"alt":"Click image for larger version Name:\tP00017.jpg Views:\t0... -
Hi everybody,
I'm Greg, 43 years old and i 'm a system engineer.
I'm seeing more and more broken items on classified ads, and I think it's awesome to be able to repair things that would otherwise end up in the trash. It's my small way of reducing electronic waste.
Hope to have some fun here as well as learn more about computer electronics and sharpen my electronics skills.Leave a comment:
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Hi guys, just decided to join your lovely forums.
I'm here to talk about computer electronics and sharpen my electronics skills. I'm a system engineer in the real life but i'd like to improve my skills in repairing laptop....Leave a comment:
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