Mesure CPU, GPU APU VCore.

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • 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.

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
  • adelfr2009
    HP Victus 15-fb dag3pamb8d0 Short on VCORE – How to Confirm CPU Fault?
    by adelfr2009
    I have a laptop HP Victus 15-fb with motherboard DAG3PRMB8D0, CPU Ryzen 7535HS, and GPU RTX 2050. The laptop has a power issue: it does not turn on at all, and there is no light on the DC jack.
    After inspection, I found that an NMOS near the charger input had a short. I replaced it, but the short remained on the 19V line. I checked the charging circuit and it was fine, but the short appears after the current sense resistor near the charger. The charger does not pass current when connected, so I inject 3V–4V after the sense resistor. No component gets hot, except the CPU which becomes...
    09-28-2025, 10:21 PM
  • Loading...
  • No more items.
Working...