I have an acer zqr no disply. Ithough vcore is error. It is +0.40v. Any advice or Suggestions are greatly appreciated.
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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... -
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... -
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... -
Ok we swapped the LCD with a known working LCD with True Tone and Webcam enabled. After we installed it on another Machine it was disabled and no True tone anymore. We took the original LCD back off and put it back on the Machine it originally came from…now True Tone and the Webcam is disabled on this machine as well! Can someone explain why is this happening? People are saying replace it with a known working LCD oem from Apple…well we just did that and now both screens are disabled. What is going on here?
So basically we took the OEM LCD(the removed one we are testing) put... -
Hi,
Recently I got an Epox EP-85 MVP3C-M board from scrap. After fixing the broken caps I powered it on without CPU and the jumpers set to 60Mhz FSB and 2x multiplier.
Sadly, Vcc3 was stuck at 3.54v regardless of jumpers. Vcc2 (Vi/o I think) was also the same voltage.
So, I've returned to the original configuration I got the board in - 100Mhz FSB and 4x multiplier. Voltages haven't changed at all.
What I've tried so far:
replace the original N-MOSFETs with beefier 60V ones for testing
Resolder the resistors near the Vcore Jumper block
Short Vcore...05-25-2025, 01:46 AM
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