Mesure CPU, GPU APU VCore.

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • dreico33
    Member
    • May 2018
    • 36
    • Bolivia
    #1

    Mesure CPU, GPU APU VCore.

    Hellow guys,

    I have came across many times to mesure VCore Coils or capasitors of a CPU GPU and APU. How we can take acurate mesuraments on these components when the same componetes most of time ( if not always) will have close to 0 resistance to ground,very low voltage drop ( in diode mode) it will beep in continuity mode. I mean whatever mesurement i take i can not be sure if we have a short or just low restistance ( very low sometimes),. How we can seperate a short from normal low restistance components?

    Τhank you for your time.
    Tags: None
    Previous template Next

    Related Topics

    Collapse
    • barry101
      Apple 820-3662 VCore shorted to ground.
      by barry101
      Hi, Would appreciate some help.
      I have an Apple Late 2013 15" A1398 MacBook Pro with Logic Board 820-3662.
      Get charger light but no fan spin or chime. No liquid damage.
      Found PPBUS and VCORE both shorted to ground. Other rails were ok.
      Removed VCORE MOSFETS U7310, U7320 and U7330. Found U7330 was in fact shorted.
      With the 3 MOSFETS removed, get PPBUS and fan spin. VCORE is still hard shorted to ground (0 ohms).
      Attempted voltage insertion on VCORE to locate short using bench supply set at 1.0 VDC and 4.95 Amps (max current for my...
      06-24-2025, 07:34 AM
    • Francisco.s
      CPU vcore missing in HP workstation Z2 Mini 4G
      by Francisco.s
      Hi, have a HP workstation Z2 Mini 4G for repair with CPU vcore missing.

      The resistance at the output of CPU vcore coils, is less than one ohm so I think CPU could be damaged, but no mosfet are damaged.
      It mounts an i7 8th gen, and have only i5 7th gen for test, but I think it is not compatible.

      Without CPU in the socket there is no short, but there is no vcore voltag, and it emits a beep like no detecting ram.

      The controller chip for cpu vcore is a MP2949A, and has no enable voltage at pin 37.

      I wonder which circuit generates this enable...
      04-22-2024, 12:35 PM
    • mikzs
      Rx580 8gb sapphire nitro+ turn off vcore randomly
      by mikzs
      Hello, this is my first post, English is not my native language but I hope you understand me. I recently got a 580 that didn't turn on the typical short mosfet, as I didn't know exactly which one was short, I unsoldered them until I got the bad one out, I was able to remove the short and identify the bad mosfet, the gpu gives video again! but it has a problem that completely turns off vcore at random times or if I try to put a load on the gpu vcore drops to 0 I don't have much idea why because I don't know much about sapphire, any advice on where I could start looking or what problem it could...
      11-06-2023, 12:28 PM
    • jm942
      Hp Lh482p 5 short 3 long short after cpu vcore mosfet replacement
      by jm942
      Hi,
      My laptop went dead and after checking ,the main 19 volt power rail was shorted. After some checks i could identify that a high side vcore mosfet was shorted.
      I replaced the mosfet and now the white powerled is present , fans start spinning but capslock shows the famous 5 long and 3 short code.

      I checked the vcore voltages after replacement and i get for all 1.01 V so means for me that the driver is still working of the replaced shorted mosfet. On the Nvidia i measure around 0.8 V after the mosfets.
      I did voltage injection on the cpu with 0.7V and i have a current...
      07-11-2024, 05:11 AM
    • conghuyms
      MSI RX580 Vcore voltage is too high, please help me !!!
      by conghuyms
      I have an MSI Armor RX580 8GB V1.3 graphics card. Currently, all power rails are present, but the voltage supplied to the GPU Vcore, which should normally be around 0.9–1V, is measuring at 1.4–1.5V. The GPU gets very hot, and the MOSFETs supplying the Vcore phases are also extremely hot, with a noticeable whistling noise.
      I’ve already replaced the UP9505P controller IC with a new one, but the issue remains the same.

      Since the UP9505P is a new IC, could it require firmware programming like some high-end graphics cards such as the RX5700XT?

      What should I do...
      08-02-2025, 11:38 PM
    • Loading...
    • No more items.
    Working...