Plz friends I need vivid explanation on how to detect short mobo with a multimeter I up 5 different mobo on my desk with similar problem. When try to check 19v every thing is short, a been trying to figure out the problem of this boards no luck. Plz assist the knowledge seeker
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Re: Shorted mother board
Most of the shorted board when connected to power a particular part of the board heat up. Plz help fix the problem -
Re: Shorted mother board
You need to check(with schematics) which line is shorted, then remove jumpers/coils etc one by one and see if short goes away. Then you can find the exact area where the short is .
Dont you have a bench psu??Comment
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Re: Shorted mother board
use it to power the mainboard, if i may recomend, remove all components that can be removed (ex. ram, wifi card & processor) before applying power using bench psu.
set the voltage on the psu between 12-15v and 2-3A to avoid further damage on the board, while power applied to board (of course it will show shorts on psu), use your hand to find hot components and becarefull, because it can be extremely hot on components that causing shortsComment
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic... -
Hi All.
I have an 820-02016 board (A2337 M1) that has come in for data recovery. Reported as liquid damage, but no visible evidence of any liquid damage.
Board was initially stuck at 5v, and current only spiking occasionally to around 400mA and cycling.
After initial troubleshooting, found that C7800 (which feeds the power rail PP5V_BSTLQ_VOUT_SPMU) was dead short to ground.
Replaced C7800 and short gone. Board still stuck at 5v. Current draw behaviour changed. It now spikes up for a second to around 100mA to 130mA, then drops down to... -
Hi All, I have a 9th Gen Dell Optiplex micro PC motherboard which doesn't power on. When I connect the motherboard with power adapter, it goes into safe mode and turns off. So from info I have gathered online, it looks like there is a short circuit on the motherboard. So can you guys help me with figuring out the issue?
I am new to electronics repair, so my queries could be naive but I am ready to learn.
So I have a multimeter and a solder with me. But I can try to get a variable voltage power supply with a thermal camera as well. From what I seen online, best way is... -
This is a Lenovo Thinkpad P15s Gen 2 with a board NM-D351. I'm having trouble finding my dead short to ground. I have the area narrowed down after much probing. You'll see in the boardview, there are two coils involved. I removed those coils and verified that that short is not on the mosfet side of those coils. . You'll see an arrangement on both sides of the board of 5 caps and one smaller one to the side. I have removed ALL 12 of these small caps and still have the short. Prior to that I injected at those caps with 1v5a and the short was only drawing 800ma so I could not see anything on thermal....03-23-2024, 11:24 AM
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