Re: 820-3209-a power on only without u7000
Can it be PCH issue as the earlier technician seems to have virtually fried the PCH.
Can it be PCH issue as the earlier technician seems to have virtually fried the PCH.
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Re: 820-3209-a power on only without u7000
Is your multimeter accurate? SMC_RESET_L should be closer to 3.42V, check both sides of R5000 to make sure this is not an issue of the SMC reset circuit.
PPBUS_G3H should be either 8.26V or 8.56V (with some margin, but not exactly 8.40V).
Make sure your multimeter isn't too far off and that it has good batteries in it.OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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Re: 820-3209-a power on only without u7000
It shouldn't be a PCH issue as the green light is not dependent on PCH. However, if there is something wrong with the PCH, the SMC may get confused or it may pull some rails down.
If the PCH is really fried, not point in working on this board any further, except if you really want to replace a PCH *and* try to fix the other issues…OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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Re: 820-3209-a power on only without u7000
After some hard work, I got the freen light on magsafe. Now mb switches with GFX core missing. Flashed a known good bios . Still gfx core missing. Checked vcore circuit and nothing wrong there. Giving up on this as i suspect PCH is damaged due to excessive heat apllied from hot air gun.
Thanks piernov for advice.Comment
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Re: 820-3209-a power on only without u7000
You could still check if you have CPU reset signal present. And try PRAM reset and check if you have any chime/beeps.OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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Hi Folks
I'm looking for a extreme high current short killer solution for a reasonable cost.
I have an LGA1700 motherboard (ASUS PRIME Z790-P WiFi) where I exchanged the LGA socket already 3 times, and every time after the socket exchange I get a short of power supply lines VCORE (V variable) and VCCIN_AUX (1.8V).
After taking off the socket, the shorts dissappear again.
The soldermask on the socket is already partially demaged from the heat, so I have reconstructed the soldermask by manually painting the missing soldermask parts with a very small top of a...10-15-2024, 10:13 AM -
I check PPBUS_AON and there is a short present on the line, the computer shows a short when testing for short to ground, so when I inject voltage into the line, I get 0AMPS so no short is showing up. I have replaced a blown cap on this board that exploded and tested for the short and it is now removed. Any suggestions? I tested voltage at the line when the fuses are connected and I am getting 1.2 Volts at the line.
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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 -
Hi all,
Recently picked up this GTX1650 at a local flea market for a low price and wanted to use it on my secondary PC. I first tested the card and saw the fan spin for a split second and then nothing. Immediately I thought of a short circuit. Disassembled and found a shorted SMD capacitor, injected voltage into it (1V/4A) and two Mosfets got hot immediately (QN3103 & QN3107). Desoldered these Mosfets and the card turned back to life.
Bought replacements from Aliexpress and replaced them afterwards. Tried the card but still the saw the fan spin for a split second... -
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...
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