i need to know what does q505 (is near the max psu chip/ right side edge of the board top side ) power cause the mosfet shorted out while i was working on it i need that info so i know what to check in before i replace the mosfet and burn it out again i removed the mosfet already it was a ao4194 and the short is gone from the charger port and no more heating in that area (i guess the mosfet was the only short )
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Last edited by dragos2009; 05-23-2020, 05:13 PM.
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Hello everyone.
Someone brought this poor hp in.
All power rails had normal resistances so i turned it on. Instant power cutoff...
First mosfet was shorted so replaced it...
After that I have tryed to start since no short was on the main power rail. the CPU middle dual mosfet heated up and protection shut down the laptop.
After investigating i have found that when the mosftet turning on then the mostfet got instantly hot (not the CPU)
Removed the faulty mosfet. -> now laptop turns on CPU mildly gets hot but laptop gives the common 5 long 3 short LED... -
Hi all,
I have recently picked up this Dell OEM Nvidia GTX 750Ti 2GB Video card. Its an old card I know but still wanted to get it working if possible. The problem is the following:
- Put the card in my testing motherboard and start running Heaven benchmark
- Benchmarks seems to run smoothly up until half way then the motherboard completely shuts off immediately
- Try to start it again and I get a slight move from the PSU fan - a clear short
- A little troubleshooting later I find one shorted Mosfet - Replace them both - short is gone
- Put the... -
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... -
I got this laptop from friend with problem short 19v....when i check this 2 mosfet getting short...i remove that mosfet and confirm that mosfet is short...
and check that 2 capacitor PC9009 and PC9004 pad is also short...already check where that capacitor goes and came from but cannot find the main problem...please help
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I tried to use this method:
Testing an N-channel MOSFET:
Step 1: Discharge the Gate (turn off the MOSFET)
Place the black probe (COM) on the Source (S) and the red probe on the Drain (D). The multimeter should show no continuity (high resistance or "OL" – open line).
Then, touch the black probe to the Source (S) and the red probe to the Gate (G). This discharges any stored charge in the Gate, turning the MOSFET off.
Step 2: Charge the Gate (turn on the MOSFET)
Now, place the red probe on the Gate (G) and the black probe on the...09-27-2024, 03:31 AM