I replaced the mark Resistor "R321, 240k ohms". Capacitor "C509" and I replaced the "U40" mosfet 3 times and when I plug the power adapter to the laptop it burn Si4435BDY Mosfet before i press the power button. Is it normal to have 19 volts present at the Drain Side of "U40"? +DCIN_SS. Kindly help me solve this problem? What is the causes of this problem?
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Re: DELL XPS 1330 BURN-OUT Si4435BDY P-CHANNEL MOSFET
ofcourse u need to have 19V on +DCIN_SS, it is main power. if u have burned u40 , u must have some short after it. check resistance to ground -
Re: DELL XPS 1330 BURN-OUT Si4435BDY P-CHANNEL MOSFET
Where would i start checking at the source side of u40?Comment
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Re: DELL XPS 1330 BURN-OUT Si4435BDY P-CHANNEL MOSFET
Mosfet U40 was removed when check the voltage at Mosfet. I check the Source side of the U40 Mosfet there is also 19 volts at the source side and 19 volts at the Drain Side. At the gate side there is 3.3 volts.Comment
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Re: DELL XPS 1330 BURN-OUT Si4435BDY P-CHANNEL MOSFET
Upload the whole schematic, can't do much with just one page..."Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHornComment
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Re: DELL XPS 1330 BURN-OUT Si4435BDY P-CHANNEL MOSFET
u need to have 19V on pwrsrc.Comment
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Re: DELL XPS 1330 BURN-OUT Si4435BDY P-CHANNEL MOSFET
uploading full schematic diagramComment
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My question pertains to understanding the control circuity inside a Dell PT434 type battery used in Dell E6400, E6410 and other Dell notebooks?
Does anyone have a circuit diagram for the inside of a Dell PT434 battery and/or a description of how the control lines work to control this battery?
My reason for asking is I have a battery which I cannot get to charge beyond 1% in a Dell E6410 or E6400.
The LED bar graph charge indicator on the battery shows one LED lighted when the info button is pressed.
I have tried multiple different Dell power adapters. My Dell... -
help what mosfet can i replace this charging mosfet 6520 the brand of laptop is dell inspiron 14 3000... -
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... -
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 -
Hi,
So I'm trying to fix the above mentioned dell laptop. It has no signs of life at all when plugged in. If I connect the AC I noticed the MOSFET PQ5 gets very hot. So I'm assuming there is a short somewhere. I'm still learning so please could someone assist me. Thanks for any help given.
I did try swopping the Mosfet which is a AO4423 with one from a donor board being a SI4483ADY as they both have the same VDS @ 30V. once I swopped the Mosfet when I plugged in the charger it would just switch off so I swopped the MOSFET back....
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