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senz_90 replied to Repairing PSU's for Resale: Is it Worth the Time & Hassle?

in Troubleshooting Power Supplies and Power Supply Design

03-07-2015, 03:16 AM
Re: Repairing PSU's for Resale: Is it Worth the Time & Hassle?

not worth your time and mind.. but useful as learning progress and fun..

In my town, I can get cheap PSUs for just about 6,5 USD. my friend open internet cafe just throw away the broken one to garbage and get a new one though its not a decent one and last for year. Sometimes I asked him to give me, but now he sold it as junk calculated per kilo

I have 4 spare cheap PSUs in my home and nobody want to buy that for sure.

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senz_90 replied to How to test computer power supply using Digital Multi-Meter?

in Troubleshooting Power Supplies and Power Supply Design

03-07-2015, 03:03 AM
Re: How to test computer power supply using Digital Multi-Meter?

I think you are the one asking "how to test computer power supply correctly?"

Agent24 didn't ask you to buy oscilloscope or manufacturing PSUs. he suggest you "the proper way" and the answer is with a proper load such as big wattage resistor and see what happened through oscilloscope. I can asnwer this easy question. YES you can "test" with HDD or fan as a load....

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senz_90 replied to PC PSU damaged by lightning strike

in Troubleshooting Power Supplies and Power Supply Design

03-07-2015, 02:46 AM
Re: PC PSU damaged by lightning strike

Third request! Pict of burnt PSUs if your friend give it next time

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senz_90 replied to Another one psu with only +5vsb output

in Troubleshooting Power Supplies and Power Supply Design

04-10-2014, 03:23 PM
Re: Another one psu with only +5vsb output

Maybe just a cold solder joint around the IC and you accidentally add a new solder and it works !!

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senz_90 replied to Another one psu with only +5vsb output

in Troubleshooting Power Supplies and Power Supply Design

04-09-2014, 04:06 AM
Re: Another one psu with only +5vsb output

Every PSUs with this 2 IC is very very common in 250W from my experience. those are cheap Chinese products that labeling 450W sh*t on their case.

For stefos.
It looks like your ground cable on mains transformer(the big one) is really bad burned. I would checks it If I were you. congrats on your repaired previously. I likes people with never give up attitude.

sometimes you will found there is one that post a thread and just WAIT for answer without effort likes make a voltage measurement,...

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senz_90 replied to Different between analog VOM with DVM on testing transistor or mosfet

in General Electronics Technical Discussion

03-29-2014, 06:47 AM
Re: Different between analog VOM with DVM on testing transistor or mosfet

maybe it is quite rare to find any ICL7106 chip on this DMM. Mine DMM also didn't have any IC on them just a black circular chip like those, maybe I have to choose the other option. thank you.

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senz_90 replied to Need help for repairing PSU with only +5vsb output

in Troubleshooting Power Supplies and Power Supply Design

03-28-2014, 12:50 AM
Re: Need help for repairing PSU with only +5vsb output

I don't know 22.9V is really high redwire, maybe this chinese cheap PSUs different with yours. I don't have a faulty PSUs recently to fix now and don't have time to compare it because some faulty CRT TV from my friend, but the result IC voltage is from 2-3 PSUs that I have compared, and all voltage is same within tolerance 3-5%. maybe stefos PSUs is different.

You need take a time to compare schematic with redwire given stefos, maybe that would help or give you some idea.

The resistor read low when...

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Last edited by senz_90; 03-28-2014, 12:59 AM.
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senz_90 replied to Different between analog VOM with DVM on testing transistor or mosfet

in General Electronics Technical Discussion

03-28-2014, 12:34 AM
Re: Different between analog VOM with DVM on testing transistor or mosfet

Yes, this cheap DMM were sold about $4 on my town. I don't have it so I couldn't see what's inside. But is this really have ICL7106/7 in there? I would like to buy it if it has, and when this failed I would scrap it around ...

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senz_90 replied to Different between analog VOM with DVM on testing transistor or mosfet

in General Electronics Technical Discussion

03-26-2014, 04:17 PM
Re: Different between analog VOM with DVM on testing transistor or mosfet

That small VOM is looks fragile. I don't like use it to measure high voltage or current, I am using the big one. If I were you I don't want to try it. If I remember correctly, the small one haven't fuse at all.

Yes, the pros is we could measure voltage and current without fear of dying battery. The original brand is SANWA japanese brand and SM-Piyes90 were right, the others are clone. it seems the small one just have a 1.5V and hard to turn on the small motor, i haven't test it yet. that small...

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senz_90 replied to Different between analog VOM with DVM on testing transistor or mosfet

in General Electronics Technical Discussion

03-24-2014, 09:29 AM
Re: Different between analog VOM with DVM on testing transistor or mosfet

For big VOM is use PP3 9V battery and 2 AA (each 1.5V). Rx1, Rx10, Rx1k produce 3VDC output and Rx10k is 12VDC. Anyone using this analog VOM on my town and it is popural here.

For the small one it is just use a single AA battery inside.

Maybe I will try to measure the current. I think my VOM couldn't make a motor run when set to Rx10k instead Rx1....

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senz_90 replied to Different between analog VOM with DVM on testing transistor or mosfet

in General Electronics Technical Discussion

03-24-2014, 04:59 AM
Re: Different between analog VOM with DVM on testing transistor or mosfet

As I know, analog VOM is common to have reverse polarity probes. red is negative and black is positive. Rx10k is supply 12VDC as I know, but I never measure the current. From my VOM label, didn't Rx1 have a greater current than Rx10k?

Btw anyone ever use this tester?
[url]http://www.electronickits.com/kit/complete/meas/dt100k.htm[/url]
is this good?Re: Different between analog VOM wit...I know, analog...

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Last edited by senz_90; 03-24-2014, 06:20 AM.
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senz_90 replied to Need help for repairing PSU with only +5vsb output

in Troubleshooting Power Supplies and Power Supply Design

03-23-2014, 04:40 PM
Re: Need help for repairing PSU with only +5vsb output

I don't know if this helps, but i have take a time to measure all IC pin voltage from 2-3 good PSUs just a guide for me when need to fix this common cheap PSUs.
The IC number maybe same as you LM339 and 7500B.

LM339
1. 4.26V 8. 1.18V
2. 0.03V 9. 2.86V
3. 4.97V 10. 2.57V
4. 1.24V 11. 4.57V
5. 0.77V 12. GND
6. 0.05V 13. 5.13
7. 2.42V 14. 4.56

7500B
1. 4.29V
2. 4.30V
3. 2.87V
4. 0.04V...

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senz_90 replied to Bi Polar vs. Non Polarized Caps

in General Capacitor Questions & Issues

03-18-2014, 12:49 AM
Re: Bi Polar vs. Non Polarized Caps

LOL. that's my fault . I realized my fault and feel that I have ever read on my country language site mention 2 type caps on electronic e.g Non polar and Bipolar caps is different. Maybe there is some typo on them....

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Last edited by senz_90; 03-18-2014, 12:51 AM.
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senz_90 replied to Dell (Liteon) PS-6311-1DS 2005 power supply.

in Troubleshooting Power Supplies and Power Supply Design

03-18-2014, 12:44 AM
Re: Dell (Liteon) PS-6311-1DS 2005 power supply.

Yes, that is the right caps, it is common thing 5VSB has 470uF on their line. right step is you could try to replace them all likes agent24 said except primary caps....

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senz_90 replied to Dell (Liteon) PS-6311-1DS 2005 power supply.

in Troubleshooting Power Supplies and Power Supply Design

03-17-2014, 04:30 PM
Re: Dell (Liteon) PS-6311-1DS 2005 power supply.

just follow the +5V STBY cable line reverse back, you will found it....

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senz_90 replied to ACER AL1916, no picture, green light, bad caps?

in Troubleshooting Computer Displays

03-16-2014, 11:12 AM
Re: ACER AL1916, no picture, green light, bad caps?

Nice, thanks for info !!

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senz_90 replied to What maybe causing this Chopper to short ?

in Troubleshooting Power Supplies and Power Supply Design

03-16-2014, 11:08 AM
Re: What maybe causing this Chopper to short ?

So it looks like we hope from luckiness, my experience is less on ebay. hahaha...

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senz_90 replied to What maybe causing this Chopper to short ?

in Troubleshooting Power Supplies and Power Supply Design

03-16-2014, 08:40 AM
Re: What maybe causing this Chopper to short ?

Btw, is there any way to recognise fake parts or items?...

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senz_90 replied to What maybe causing this Chopper to short ?

in Troubleshooting Power Supplies and Power Supply Design

03-14-2014, 02:08 AM
Re: What maybe causing this Chopper to short ?

Yes, indeed ICL7106 would work. But I couldn't found anyone sell this ICL7106 or ICL7107 on my town. thank you, please inform if you build it successful. By the way, I am too build ringer replica from anatek . It looks like not a problem since I don't sell it, I am using it for myself to servicing CRT TV and Monitor....

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senz_90 replied to tv power supply caught fire! why?

in Troubleshooting Power Supplies and Power Supply Design

03-11-2014, 06:50 PM
Re: tv power supply caught fire! why?

Thank you !! since Im still learn deeper about electronics this would make easier learn further. So sorry for other topic that I made, back to the thread !!

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Last edited by senz_90; 03-11-2014, 06:52 PM.
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