This board is out of an HP laptop. There is no voltage present at pin 8 of the Winbond BIOS chip. A nearby coil is a near dead short to ground. Injected 1v and it drew 2.8a but nothing was warm on the board. Then I upped the voltage to 2.5 and 3.5a were drawn, but still no heat. Is that crazy?
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Re: shorted power rail - drawing 3.5 amps but no heat?
Could the heated part be the CPU that may be with a heatsink? -
Re: shorted power rail - drawing 3.5 amps but no heat?
Great! Maybe better to begin from MB model and the pictures? How you measure the temperature: by finger, lips?Comment
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Re: shorted power rail - drawing 3.5 amps but no heat?
mb from hp, near some coil... What kind of help do you expect with such inputs? Which coil? if no position at the MB silk, then show it on the pictureLast edited by gs84; 03-02-2023, 04:50 PM.Comment
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Re: shorted power rail - drawing 3.5 amps but no heat?
ok, I'll wait.
Attached FilesComment
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Re: shorted power rail - drawing 3.5 amps but no heat?
If you can just mention the coil number, i can tell you which rail it is as i've worked on plenty of this model. Schemaic is not available for LA-D704. Whatever schematic you see labelled as D704 is not an exact schematic. Its a blunder to inject 2.5V on any coil.Comment
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Re: shorted power rail - drawing 3.5 amps but no heat?
Also possibility exists that SIO is shortComment
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Re: shorted power rail - drawing 3.5 amps but no heat?
1V/5A and sometimes even 1V/10A.Comment
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Hello,
This is my problem:
Laptop: Dell Latitude 5501
Motherboard: EDC51 LA-H181P
I have two power rails shorted to ground, +1.0V_PRIM and +3.3V_ALW_PCH. I removed solder on PJP302, +1.05VALWP (pad1) not shorted but +1.0V_PRIM (pad2) shorted.
I also cleaned PJP38, pad1 not shorted, pad2 (+3.3V_ALW_PCH) shorted to ground.
I measure the resistance of all the coils on the motherboard and they all were not shorted to ground except coil PL301 before I removed the solder on PJP302.
I injected +1.05V - 2A... -
Hey guys got laptop like above. Came to me with shorted main power rail and battery protecion on ( 0V on output). Got rid of short but nothing. Bench power supply says it takes nothing, but still got all voltages 1,2v,3.3v,5v - all good. Thermal cam showed nothing is starting even for a sec. I believe that since all coils etc are good resistance to ground it's probably one of chips. Can be IO chip or maybe something else? Could somebody help me out with this one - it's blowing my mind lol -
Hi All,
I have this MSI GTX-980ti Gaming Golden Edition. It had shorted mosfet on memory. Replaced the shorted i.e. Q47 PK616BA with 4C09N and the card ran fine for a month. Then suddenly again the same problem. This time when i replace it 4C09N or with replacement PK616BA (Aliexpress) it gets shorted. As soon as turn on the PC the PSU shuts down and the same mosfet Q47 gets short.
What should be the next step. Kindly guide.
The board view files for this gpu is available and attached. https://www.badcaps.net/forum/showthread.php?p=1237952... -
For today's thread, I have a KingWin ABT-650MM ATX PSU. Official web page with the PSU specs is still up and can be found here:
http://www.rmac.kingwin.com/products.../abt_650MM.asp
I just can't help it when I see a broken / for parts PSU on eBay that's listed for cheap and looks at least somewhat interesting. Well, OK, I won't lie – on the outside, this PSU looks anything but interesting. It's a plain gray box with colorful “spaghetti cables”.
What mostly drew me into buying it is its 2x PCI-E power connectors... -
Hello everyone,
I'm trying to repair my old Acer Nitro 5 (AN517-54-55T5). I've already bought a new laptop, so this is more of a learning project. For the experience, with no high expectations of success.
Well, my decice specs are the following:
Model: Acer Nitro 5 AN517-54-55T5
CPU: Intel Core i5-11400H
GPU: NVIDIA GeForce GTX 1650
Motherboard: GH51G LA-L181P Rev:1c
The symptom:
When pressing the power button, the power LED lights up for about 5 seconds and then turns off. Initially, the issue was intermittent: sometimes...05-26-2025, 10:49 AM
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