Repair on powercolour Hd7950 3GB

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • anikin73
    Senior Member
    • Mar 2022
    • 112
    • singapore
    #1

    Repair on powercolour Hd7950 3GB

    I received a power colour Hd7950 3Gb GPU.
    Diagnostic card stuck at b2 and cannot cross it. So not output screen.
    On board graphics also do not have output.

    I measure all the voltages, the core gpu ( I forgot is technical name) voltage rise and fall to 0V. the rest of the voltages are fine.

    How to troubleshoot this type of problem. the PWM chip is working and enable voltage is there , so that is why there is a rise in voltage.
    Tags: None
    • didi79
      Senior Member
      • May 2021
      • 80
      • BE
      #2
      Re: Repair on powercolour Hd7950 3GB

      Does it detect as a secondary card?

        Comment

        • anikin73
          Senior Member
          • Mar 2022
          • 112
          • singapore
          #3
          Re: Repair on powercolour Hd7950 3GB

          Originally posted by didi79
          Does it detect as a secondary card?
          No it does not detect at all. Basically the voltage did not appear also, So i think it is go back to basic to check circuits.

            Comment

            Previous template Next

            Related Topics

            Collapse
            • Tynan Dill
              Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
              by Tynan Dill
              I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

              Upon bringing it home and plugging it up, it showed a standby light.

              I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

              The screen seems to blackout and stay black, but with a flashlight I can see the display.

              With my Playstation 4 connected via HDMI, and running a game I can hear sound.

              Assuming...
              ORIGINAL POWER SUPPLY BOARD
              7 Photos
              11-22-2024, 01:46 PM
            • hikomalek
              SYMSI70 gas heater, TOP247Y exploded, power supply, snubber network
              by hikomalek
              Hello, I have a SYMSI70 gas heater board, which has issues with its primary side power supply, controlled by TOP247Y chip.
              When I replace a TOP247Y it explode in 1 second. I have desoldered transformer and measured a winding ratio, so transformer looks like OK.

              Transformer:

              |Info| Primary | Aux | AB | CD|
              |-|----------|----------|-|-|
              |Ratio|1|25|40|12|
              |Voltage AC|230V|9.2V|5.8V|19V|
              |Voltage DC (*1.41)|230V|13V|8.1V|27V|

              I have disabled a undervoltage protection of TOP247Y, disconnected secondaries and tried to power it up...
              09-19-2025, 03:30 AM
            • modtool
              Huawei Matebook D14 - NbB-WAH9Q - Shorted DrMOS MP86945A - DAH98NMB8B0
              by modtool
              Hi to all, this laptop came with no signs of life, no battery chargin and no start.
              I found that the main 19v rail was almost shorted, it measured around 7 Ohms , then searching better I found a shorted MP86945A DrMOS (between Drain and Source) that converts the 19 volts into the PCH core voltage...
              I was going to chuck the towel, but I had a new same DrMOS then decided to solder it in, then I connected the power jack and the system now powers almost on, all the voltages rise but the CPU core and VGFX core.
              Externally I only see that keyboard backlight lights up for 2 seconds,...
              09-29-2025, 08:05 AM
            • electron_jj
              Panasonic TH-L42D25A checking the PSU output voltage
              by electron_jj
              Hi Everyone, I am new to this forum. I have a Panasonic LED TV which doesnt turn on and is blinking 4 times repeatedly when I turn on the switch. The TV does not respond to the remote control so I had to turn on using the physical switch on the side of the TV. When I turn on the switch the 4 x blinking starts and repeat itself until I turn off the TV. There is a black screen. I turned off the light in the room to check the panel and I think there is no backlight as far as I can tell.

              I have been inspecting and testing the capacitors and diodes in the power supply board to try to...
              08-29-2021, 08:13 AM
            • sam_sam_sam
              Trip light 2400 watt line conditioner bought used issue with low voltage oscillation going on between relays
              by sam_sam_sam
              I found two capacitors on the board and one of the leads on one capacitor had bad soldering joint and the other joint connections not much better and there were several soldering joints that way to much flux around the joint redid several of them

              The capacitors were a non brand that I did not recognize they got replaced and now it does not oscillating between relay but what concerns me a little bit is when the voltage is a little bit low the output voltage is around 130 volts and then drops down to 115 volts this happens around 105 to 108 volts if remember correctly

              Now...
              06-09-2024, 10:57 AM
            • Loading...
            • No more items.
            Working...