I've been trying to repair this battery circuit for a Toshiba and everytime I replace a bad Mosfet, another Mosfet gets shorted and I have to replace it, gone through almost 10 good Mosfets. Already replaced the battery charger IC.
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Re: What's a good reason new Mosfets get shorted?
You need to find out what component is short circuit/faulty otherwise you are just putting new parts to go faulty again. Find source of problem first -
Re: What's a good reason new Mosfets get shorted?
LA-3441P
https://cdn.badcaps-static.com/pdfs/...975c707331.pdf
The last mosfet to get shorted was PQ16.Comment
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Re: What's a good reason new Mosfets get shorted?
PQ16, is a well protected mosfet, its current, is controlled by PU4, sensing voltage at PR62.
Could be PU4 is damaged and drives PQ16 in the wrong way.
What about PQ18?. Is laptop functioning properly with battery?Comment
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Re: What's a good reason new Mosfets get shorted?
Sorry for not reporting back, had to cancel repair because of deadline. Thanks again.Comment
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It has been a long while since I posted here to ask anything....hope you can help.
I have this Samsung power supply that uses SPC1012T as driver for the PFC and it's giving me a problem that I can't narrow down though I've troubleshooted and fixed hundreds of boards similar circuits.
I am attaching a schematic from a different Samsung board, but the topography is very very similar if not 100% the same and it uses SPC1012T, which BTW is a pinout match to UCC28063 for which there's plenty of information. I haven't confirmed they are functional equivalents, but I strongly... -
Hello:
I have both these laptops that appeared to have the same fault so I thought I would have a go at replacing the PCH as something to learn, they both are using the same PCH.
I started on the ACER:
Up on connecting power no signs of life but current is consumed from the bench power supply and the PCH is hot.
All the caps on the top of the PCH are showing 0 ohms and the 3.3v rail is shorted.
I followed the videos from Sorin, Electronics Repair School on Youtube heating from the bottom to install. I practised on around 10 scrap... -
Hi every one. I just want to share the successful repair of my shorted Panasonic TNPA4782AB SC board.
I don't usually do it but so many parts were shorted that I decided to buy the ShopJimmy repair kit instead of sourcing each components individually. Here is the list of components the kit contained, with a remark indicating if I needed that part or not :
D608, good
D618 RF101L4S, good (See warning 1 below)
D619 RF101L4S, good (See warning 1 below)
D865 RF101L4S, shorted (See warning 1 below)
IC464 Inverter HA MC74HC1G14, shorted...03-09-2020, 12:00 AM -
Laptop model: Sp513-54n-74V2
Testing power rails (separated by chip) reveals:
19V_DCBATOUT - (active)
5V_AUX_S5 - (active)
5V_S5 - (active)
3D3V_AUX_S5 - (active)
3D3V_S5 27Ω - (good) - enabled by Nuvoton chip
1D8V_VCCIN_AUX - (good) - enabled by 1D8V_S5 PG signal -- (dependent on 3D3V_S5)
1D8V_S5 41Ω - (good) - enabled by 3D3V_S5 PG signal
1D05V_VNN_BYPASS - (good) - enabled by 1D8V_VCCIN_AUX PG signal... -
Good day, I need some assistance with this laptop. It came in with no power after a liquid spill. The device was very dusty and one of the inrush mosfets exploded, the other was shorted and of course a shorted 19V power rail. I replaced the following defective components to clear the short:
PQB4 (AON7380, this one blew up, pads needed to be rebuilt, no vias)
PQB3 (EMP21N03HC, this one was shorted)
PQB1 (L2N7002WT1G, burnt and cracked)
PUV2 (QD9619AQR1, shorted)
After replacing these components and checking to make sure there were no shorts, the laptop powered on for...
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