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PeteS in CA
Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
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To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
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Re: Antec EA-430D 5VSB issue
they are lego bricks filled with metalised polyester - the description was valid
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Re: Antec EA-430D 5VSB issue
Just wanted to give an update to let everyone know that the power supply is now fixed.
Ultimately the main issue was the main 450V ( 270uf Aishi) cap. I replaced it with a Rubicon MXK 450V 390uf. And i replaced the TNY278 IC ( blown due to bad main cap). Now the 5VSB works and the power supply runs without issue.
Thanks again for everyone's helpful comments and insight. I learned a lot and now have a deeper understanding of how it works. And would not got this far without the help to theorize and understand what was happening.Attached FilesComment
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Re: Antec EA-430D 5VSB issue
Awesome! Great to hear your PSU is working again!
And that Ruby 450V/390u should provide much better hold up time (from the larger capacity) in addition to lasting longer, as it should be capable of higher ripple current.
I've only seen ceramics. But even those will help!
That said, I did put film P.P. caps (2.2 uF, 450V) in a few PSUs with APFC that I've repaired. Not sure if that will help and for how long (as these PSUs haven't been put back to permanent use again, yet.) Hopefully, we will see... or not?
*Ahen* I believe LEGO bricks are made of ABS plastic.
(Sorry, but as a former "Lego nerd", I had to include this correction here. )
Also, polypropylene might be a better choice than polyester, as the former usually has more consistent specs/characteristics over a much wider range of frequencies.
In all honesty, I always hesitate to press the power button on my PCs that have PSUs with APFC (especially the ones that still have cheap caps or just 400V caps) - just kind of anticipating a big bang some day.
Last edited by momaka; 05-10-2021, 08:25 PM.Comment
You have a way with words! Maybe polypropylene? I'm pretty sure I've seen film caps in parallel with the big lytics in some PSUs.
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Hi everyone,
I'm working on a MacBook Air 2020 (A2337, board 820-02016) and running into a strange USB-C issue. I've gone through quite a bit of testing and part replacement, but I'm stuck — hoping someone here can shed some light.
🛠 Original Issue
The machine initially wouldn't negotiate 20V over USB-C — stuck at 5V.
Diagnosis showed PP1V5_UPC0_LDO_CORE shorted to ground.
I replaced U3100 (UF400) using a donor board (A2179), and the machine powers on fine now.
⚠️ New Problem: One USB-C Port Only Works in One Orientation... -
I have three identical-spec 820-01700 boards (2.6/32/512), and ALL THREE boards came to us with the same fault, from different sources: The boards don't wake from hibernation with the keyboard or lid, they ONLY wake when you press the power button. I understand this is a very minor issue, but the boards must be fixed!
We will of course begin with the obvious (checking lid signals), but I couldn't help but notice these three boards were all 32GB variants. Has anyone noticed an issue relating to these 32GB boards in particular? I of course don't think it's a RAM issue, but it's bizarre... -
HP Pavilion 15-CW1002UA
S/N 5CD0251CBC
P/N 7KE54EA
Hello guys!
I have a strange issue with my laptop keyboard and I'm lost trying to detect what's wrong - the KB9028Q-C or the keyboard itself.
It powers on OK and has no other issues except the following:- CAPS LOCK does not work at all
- Fn button toggles Flight Mode
- When I press 't' or '5', it produces 't5', and when I press 'y' or '6', it produces 'y6'
- (with SHIFT pressed: 't%' and 'y^' respectively)
but when I press and hold...06-27-2025, 01:10 AM -
Hello everyone,
I'm experiencing an issue with my Alienware 15 R2 (Service Tag: DL7NN32). The laptop works perfectly when connected to the AC adapter — it powers on and functions normally. However, the battery does not charge. If I disconnect the DC adapter, the laptop shuts down immediately, as the battery is at 0%. I have replaced the battery with a new compatible one, but the issue persists. I also replaced the AC adapter with a compatible one, but the battery still doesn't charge.
To assist with troubleshooting, I'm attaching two power circuit schematics:- Power
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Hello everyone,
I am experiencing a BIOS-related issue with my Dynabook Satellite Pro C50D-B-100. When I power on the laptop, the screen stays black, and there is no response from the system. I suspect a corrupted BIOS.
I have checked the forum and the available documentation but could not find a solution specific to my issue.- Brand & Model: Dynabook Satellite Pro C50D-B-100
- Part Number (P/N): PYU13E-00C00PFR
- Serial Number (S/N): 22028896H
- System Configuration (SC): A1PYU13E1127
- Motherboard Model: IP3_ACN16_MB_V21_20211222A
- Power Input: DC 19V –
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