Radeon HD5770 short circuit?

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • b3ta
    New Member
    • Jun 2013
    • 7
    • Latvia
    #1

    Radeon HD5770 short circuit?

    Hello,
    I have on my hands possible short-circuited card.
    It has no video output and system doesn't detect it, but gpu gets hot and therefore I think it's not completely dead... YET
    What I should check first and how?
    I have very little experience in components testing(only capacitor re-soldering)
    Please help!
    Sorry for bad image quality
    Attached Files
    Tags: None
    • b3ta
      New Member
      • Jun 2013
      • 7
      • Latvia
      #2
      Re: Radeon HD5770 short circuit?

      Can I test(with DMM) these power mofsets(4906MG) while they're on the card?
      There should be inf. resistance between source and drain right? Or am I doing smth. wrong?

        Comment

        • Th3_uN1Qu3
          Believe in
          • Jul 2010
          • 6031
          • Romania
          #3
          Re: Radeon HD5770 short circuit?

          There won't be infinite resistance between source and gate on the low side mosfets. More likely 10-20 ohms, because there are dozens of parts connected there.

          If you say the GPU gets hot but no video, i doubt it is a short circuit. Either the video BIOS is damaged or (more likely) some of the solder balls under the GPU have cracked and it requires reflow or better, reballing to work once again.
          Originally posted by PeteS in CA
          Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
          A working TV? How boring!

            Comment

            • b3ta
              New Member
              • Jun 2013
              • 7
              • Latvia
              #4
              Re: Radeon HD5770 short circuit?

              There were no problems before aftermarket cooling solution was installed, so I guessed there were some touching involved between cooler mounts and vga

                Comment

                • blasterboomer
                  Senior Member
                  • Dec 2013
                  • 135
                  • United Kingdom
                  #5
                  Re: Radeon HD5770 short circuit?

                  is the part labelled with yageo r47 near the pcie power connector supposed to be at an angle like that?

                    Comment

                    • blasterboomer
                      Senior Member
                      • Dec 2013
                      • 135
                      • United Kingdom
                      #6
                      Re: Radeon HD5770 short circuit?

                      The cap under it also looks to be at a strange angle.. check to see if its supposed to be like that or not... looking at the back of the board where the cap is located will help u

                        Comment

                        Previous template Next

                        Related Topics

                        Collapse
                        • Document Archive
                          AMD Radeon R9 290 / R9 380 / R9 390 Schematic & Board View
                          by Document Archive
                          AMD Radeon R9 290 / R9 380 / R9 390

                          The Radeon R9 290 was a high-end graphics card by AMD, launched on November 5th, 2013. Built on the 28 nm process, and based on the Hawaii graphics processor, in its Hawaii PRO variant, the card supports DirectX 12. This ensures that all modern games will run on Radeon R9 290. The Hawaii graphics processor is a large chip with a die area of 438 mm² and 6,200 million transistors. Unlike the fully unlocked Radeon R9 290X, which uses the same GPU but has all 2816 shaders enabled, AMD has disabled some shading units on the Radeon R9 290 to reach the...
                          10-01-2024, 12:46 PM
                        • aaronkatrini
                          Help me find the short circuit on this WORKING Nvidia GTX1650
                          by aaronkatrini
                          Hi all,

                          Recently picked up this GTX1650 at a local flea market for a low price and wanted to use it on my secondary PC. I first tested the card and saw the fan spin for a split second and then nothing. Immediately I thought of a short circuit. Disassembled and found a shorted SMD capacitor, injected voltage into it (1V/4A) and two Mosfets got hot immediately (QN3103 & QN3107). Desoldered these Mosfets and the card turned back to life.

                          Bought replacements from Aliexpress and replaced them afterwards. Tried the card but still the saw the fan spin for a split second...
                          04-18-2024, 03:15 PM
                        • Geeker007
                          9th Gen Dell Optiplex Micro PC motherboard repair: Short Circuit?
                          by Geeker007
                          Hi All, I have a 9th Gen Dell Optiplex micro PC motherboard which doesn't power on. When I connect the motherboard with power adapter, it goes into safe mode and turns off. So from info I have gathered online, it looks like there is a short circuit on the motherboard. So can you guys help me with figuring out the issue?

                          I am new to electronics repair, so my queries could be naive but I am ready to learn.

                          So I have a multimeter and a solder with me. But I can try to get a variable voltage power supply with a thermal camera as well. From what I seen online, best way is...
                          01-28-2025, 03:31 PM
                        • fab13
                          Nintendo Switch lite charging chip heats up and does not short circuit
                          by fab13
                          Hello everyone


                          Small technical problem on a Nintendo Switch lite
                          Here's what I noticed: the USB port has been damaged internally, with a short circuit on the power supply line to the small fuse.

                          After replacing the USB connector, the short circuit went away and I can't see any other short circuit in the whole motherboard.

                          When I charge the console, it seems to be charging: I get 15 volts and an amperage of 0.450 A.

                          Then, after a while, the amperage increases to 1.1 A and the BQ24193 charging chip starts to heat up, as evidenced...
                          09-16-2023, 04:59 AM
                        • Tarot Superstars
                          Short Circuit tester
                          by Tarot Superstars
                          Hello.
                          I have seen a short circuit tester made with 3 * 9V batteries, a voltage limiter component and a resistor connected to the probes of a multimeter.
                          The theory is that the meter becomes sensitive enough to read very low resistances and the lowest resistance to ground on a circuit is likely to be a short circuit in that area.

                          Link
                          The Amazing $1 Short Finder Upgraded! Convert ... - YouTube
                          https://www.youtube.com/watch?v=0eixDdCpiO4

                          My multimeter isn't normally sensitive to very small resistance, but when I put a 1 mega ohm resistor...
                          09-25-2023, 09:11 AM
                        • Loading...
                        • No more items.
                        Working...