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Search: Posts Made By: zx8401
Forum: Troubleshooting Power Supplies and Power Supply Design 09-17-2019, 06:44 AM
Replies: 1,591
Views: 337,361
Posted By zx8401
Re: the gutless, bloated, and fried power supply hall of shame

Dannyx

That one looks nicely cooked :-D
Im supprised that someone didnt push the aluminium casing up against the bare metal of the shipping container, dump some of the heat maybe.
Or add a 12v...
Forum: Troubleshooting & Designing Networks 04-02-2019, 11:33 AM
Replies: 2
Views: 540
Posted By zx8401
Re: Asus WL-500W Wireless Router need service scheme

Download this zip, the last download on the page.
https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=425640&sid=2ccad770afc9fe76ade1822f3fb2c467
Forum: General Electronics Technical Discussion 02-12-2018, 02:34 PM
Replies: 8
Views: 573
Posted By zx8401
Re: Power windows automatic Switch

I would look at the contacts first, they may be a simple 6 pin double pole double throw switch.
You may need to dissasemble one to see how they are configured.
Sorry im not helping much, i would...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-06-2018, 12:19 PM
Replies: 24
Views: 1,317
Posted By zx8401
Re: 24v to 12v project guidelines

What about using an old mains to 13.8v linear supply but lopping off the transformer and feeding the 24vac into the supply bridge?
You might need to add a bigger heatsink and pass transistor...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 04-25-2017, 12:46 PM
Replies: 9
Views: 693
Posted By zx8401
Re: Acer 5250 0816 Powers Off

Have you tryed putting the memory strip in the bottom slot only?
Some acer machines wont do anything if its wrong.
Forum: Troubleshooting Power Supplies and Power Supply Design 04-24-2017, 04:24 PM
Replies: 23
Views: 2,181
Posted By zx8401
Re: Weller PU81 bad transformer?

Check D2 and D7, one may be shorted.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 04-03-2017, 11:59 AM
Replies: 4
Views: 1,611
Posted By zx8401
Re: Acer aspire 4250 No Display.

The questions i would ask is:

Does it appear to boot up, flashing hard drive led, or accessing a bootable usb drive?
Has it had the bios flashed, then stopped working?
Does it charge the...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 04-01-2017, 12:46 PM
Replies: 4
Views: 1,611
Posted By zx8401
Re: Acer aspire 4250 No Display.

Does it work if you connect an external vga monitor?
Forum: General Computer & Tech Discussion 03-17-2017, 08:13 AM
Replies: 4
Views: 1,000
Posted By zx8401
Re: Total failure/loss on hard drive.

WoW!! ive never seen that happen before.
Thats a really well wiped drive LOL :-D
Forum: General Computer & Tech Discussion 03-17-2017, 08:09 AM
Replies: 4
Views: 1,074
Posted By zx8401
Re: Laptop Blackout

Ooow that sounds like an odd effect, it sounds like the laptop cant cope with a faulty battery, i bet the laptop wont switch on if on mains but no battery inserted.

Thanks for posting though, i...
Forum: General Electronics Technical Discussion 02-05-2017, 04:34 PM
Replies: 33
Views: 3,270
Posted By zx8401
Re: Full wave rectifier vs bridge rectifier?

That output stage is a bit naughty, no seperate emitter resistor for each transistor, the transistor with the best gain will be working harder than the rest :-(
Forum: Troubleshooting Power Supplies and Power Supply Design 01-27-2017, 02:25 PM
Replies: 45
Views: 3,207
Posted By zx8401
Re: Manson hcs 3202

There is a shutdown input into D17 on the secondary diagram, is it possible that the micro controlling the psu has lost controll and takes shutdown high?
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 01-17-2017, 02:54 PM
Replies: 3
Views: 683
Posted By zx8401
Re: Macbook 1268 No HDD Power

Im not into mac's but here is a schematic you may find interesting.
Page 41, some chokes to the sata chip could of bit the dust perhaps.
Forum: BIOS Requests ONLY! 01-13-2017, 01:48 PM
Replies: 4
Views: 1,040
Posted By zx8401
Re: ACER aspire 5315 bios need

here is the address: https://www.acer.com/ac/en/GB/content/support-product/50?b=1
Go to the bottom and click bios/firmware, download from there.
Hope thats what you wanted :-D
Forum: Troubleshooting Power Supplies and Power Supply Design 11-26-2016, 02:58 PM
Replies: 10
Views: 2,269
Posted By zx8401
Re: Old Tatung SMPS design, expert comment needed ...

Replace R801 3.3r 10w with double the value and wattage perhaps?
Better a pot resistor get hot than other parts.
Forum: Troubleshooting Power Supplies and Power Supply Design 11-26-2016, 12:16 PM
Replies: 14
Views: 2,603
Posted By zx8401
Re: Corsair HX 620w burnt coil?

The pcb behind the coil looks black, it may be just muck, on the other hand it could be a cremated part.
I would unsolder that coil and look for dead parts.
Forum: Troubleshooting Power Supplies and Power Supply Design 09-26-2016, 03:01 PM
Replies: 17
Views: 3,380
Posted By zx8401
Re: UA55JU6600KXXA SMPS -> PCB Main

Make sure the screws that hold the psu pcb down are not loose, under some screws are tracks that need to be connected to the chassis, it can affect operation.
Sounds silly, but some tv's wont work...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-26-2016, 02:47 PM
Replies: 6
Views: 1,309
Posted By zx8401
Re: 12 Amp power supply brick will it put out 12 amps

Looks nice to me, thick heatsinks on the output rectifiers and mosfet :-D
All the filtering on the input, not cheap-n-nasty.
Forum: Troubleshooting Power Supplies and Power Supply Design 09-07-2016, 10:34 AM
Replies: 12
Views: 1,425
Posted By zx8401
Re: How good or bad is this little power supply

The pcb gap under the transformer looks decent, the emi capacitor look decent.
Its only 300ma so i dont expect it to get too hot.
It has the typical tl431 and optocoupler feedback so its not...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-20-2016, 08:39 AM
Replies: 23
Views: 2,638
Posted By zx8401
Re: Any practical examples of success repairs

I would say a basic knowledge of the typical blocks used in power supplys is very helpfull, there are many schematic diagrams on the outernet, look at most and you will see common designs/patterns.
...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-20-2016, 08:16 AM
Replies: 12
Views: 2,200
Posted By zx8401
Re: Bestec ATX-250-12Z rev D

The problem is often manufacturers change there mind so much, slight letter changes on a model number can mean big differences :-(.
If you look at the info you have, you can often see similar...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-17-2016, 04:25 PM
Replies: 12
Views: 2,200
Posted By zx8401
Smile Re: Bestec ATX-250-12Z rev D

Here is a 300W version, this schematic may be usefull :-D
[/url]139371
Forum: Troubleshooting Power Supplies and Power Supply Design 08-17-2016, 03:58 PM
Replies: 86
Views: 6,838
Posted By zx8401
Re: SATA /PATA external supply ?

Im not sure what you are doing with testing the opto coupler.
Look at my diagram again please, the output should show a resistance around 100 to 500 ohms (depending on dvm used).
The 1.5v is the...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-31-2016, 09:52 AM
Replies: 86
Views: 6,838
Posted By zx8401
Re: SATA /PATA external supply ?

A Basic test to see if the opto coupler is working is to connect 1.5v to the led side and see if the transistor side goes low resistance in value.
The meter should show open circuit with no voltage...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-31-2016, 07:02 AM
Replies: 86
Views: 6,838
Posted By zx8401
Smile Re: SATA /PATA external supply ?

They do test correct in only one direction yes?
If you get the same reading in both directions they are faulty.
Showing results 1 to 25 of 42

 
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