Could somebody please identify u60100? It goes up and down between 3.3V and 0V.
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If the power rail is cycling then the regulator is in chirp mode. This is probably due to an excessive current draw on the output power rail or the current sense circuit is reporting it as such. Remove all power. Measure the resistance (not diode mode) to ground of this same 3v3 rail that is pulsing. What is the resistance in ohms?
A typical pinout and use of this regulator:
10pieces SY8286BRAC SY8286B (AWV5QB AWV5BB AWV5JA AWV...) QFN-20 chipset - AliExpress 502
SY8286BRAC Silergy Corp | C358653 - LCSC ElectronicsLast edited by mon2; 09-06-2024, 08:23 AM. -
Thanks for the good info.
The resistance to GND from the 3.3V coil is 2K, just like the 5V coil which is stable.
The pulsating coil takes about 4 seconds to cycle.Comment
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Check the resistance to ground on LDO pin #17.
Are the ENx (enable signal) pins also pulsing?Comment
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Thank you.
LDO = 16K
EN2 = 1.6V steady
EN1 = pulsating up to 3.1VComment
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Hi, I'm Daniel, and I'm new to the world of repairing motherboards.
I would like to create a table, or more likely a guideline about the voltage rails and their possible resistance rail.
I know that the motherboard design has a very big depend on the rail's resistance, but I would like to know what is the smallest value for a rail that can be acceptable. For example, I heard that some new gaming motherboards can have 0,5 Ohm resistance on the GPU rail, but on an older type, it could be a sign of a shorted GPU rail.
So, I generated a table with AI so I can... -
I know I've been a little scarce lately (like the last 2-3 years), but I'm still here and still doing my thing with fixing PSUs.
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It's a modern ATX unit with fixed (non-modular) cables and an 80-plus bronze certificate. Here's the label:
https://www.badcaps.net/filedata/fetch?id=359177... -
More eBay specials: this time a Gigabyte GP-P450b 450W ATX PSU for $8 with free S&H. Listed “For part/not working”, as usual. Showed up in a beat up EVGA box without any padding… but that's understandable given the total price. PSU made it out fine without damage. It's a non-modular (yay!), pretty modern-day looking PSU with a black paint and all black cables (meh, not my favorite, but figure it's good to keep a few of these in case I do need one for a more modern PC build, just so my old gray boxes don't look too odd in there.)
And a shot of the label:... -
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:
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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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