Comments on: 750 Watt PC Power Supply Repaired

By: Ulises Aguilar Pazzani

Ulises Aguilar Pazzani — Tue, 14 Mar 2017 02:11:21 +0000

Mr Bemmelen very good testing very technical fix Sir

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By: Albert van Bemmelen

Albert van Bemmelen — Wed, 22 Jun 2016 07:11:28 +0000

Sorry for my late reply Radley, but that is because the reply button before just didn't work. I guess the best thing you can do is dig up any circuit or service-manual you can find for your LG that explains what to repair or replace.
Maybe you can find more on any forum on the subject that someone has solved concerning your device. I guess if its the laserhead that has gone bad you need to replace your DVD player inside the LG Home theater set? Good luck.

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By: Albert van Bemmelen

Albert van Bemmelen — Tue, 21 Jun 2016 06:28:13 +0000

Please Discard my previous post !!
I never had any problems with the LCD ATX Tester myself.
But because some readers apparently wrote about some concerns they had that it probably not always does test Power Supplies satisfactory because some Mainboards were not operating after a completed ATX LCD Tester test, I thought I had the same problem here.
It wasn't the case, so I only can tell anyone that I guess the comments about the ATX Tester not always working correctly were not supported by real existing facts. And my last post above can completely be erased as redundant or obsolete.
I rather think some readers made the same error I had made by just connecting one of the 12V 4pin (FAN) connectors wrong onto the PC Mainboard! Because my friend Frans told me yesterday that he noticed that the 4 pin connector was previously connected the wrong way onto the Mainboard while quickly testing on his son's Big Tower PC Board. Which should not have been possible but somehow can be done!
Creating the result that looks like : 1. the ATX Tester test was at Fault,
and 2. the Power Supply was still defect. Which of course was not the case whatsoever !!
I therefore leave my fine working ATX LCD Tester just the way as it is. And I am glad to tell any reader of my article that my 750 Watt repair article was correct at every written text character!
The 750 Watt Supply was completely fixed after my quick repair!

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By: albert van bemmelen

albert van bemmelen — Mon, 13 Jun 2016 10:22:19 +0000

Thanks all for your kind replies! I have however to explain something
unexpected and wierd that occured after the Supply was Tested on a Real
PC Mainboard lateron. And keep in mind that the ATX 750 Watt Supply tested
okay on the ATX LCD tester! And it also did on another new 20-24 pin ATX
Power Tester!
But as soon as the 4 pole FAN 12Volt connector (the 2 Black and 2 Yellow
wires) was connected to the Mainboard the PSU stopped working. So then I
tested the Supply on my friends PC Mainboard without using the 12V
connector. And the Desktop PC started but in fact didn't do anything
because it couldn't be stopped by holding the Power Button for 4 seconds.
Another 500 Watt PSU was then attached to the same Mainboard also
connecting the 12V Fan Mainboard connector. And now the Desktop PC really
worked !!
So this means two things: 1. The 750 Watt Unit still must be defect in one
of the controller chips that I haven't replaced yet, the FSEM311Z or the
EST 7610 chip. Because everything else seems to have tested fine!
2. The ATX TESTERS are not capable of detecting this defect because the
four Pole 12V connector tested well! However maybe the not working 8 pole
connector shorting the ATX Supply on the LCD ATX Tester is an indication
of this defect, as I wrote at the end of my article?
As soon as my friend brings his 750 Watt Supply, and both already ordered
Chips are recieved I will be able to answer this strange unexpected
question.

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By: Paris Azis

Paris Azis — Mon, 13 Jun 2016 06:55:27 +0000

Interesting case, Albert and nice job as well.

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By: Chris

Chris — Thu, 02 Jun 2016 22:59:57 +0000

Hi Albert!
That's a nice article with lot of investigation and declarations.
I always love to read your article because of the way as you describe the problematic and all the road until you reach the goal.
As I read a good crime book such as Sherlock Holmes.
But, exactly this is why I love electronic and cybernetics science.
Great job and you are a great master of electronic repairing.
And! I'm always frustrated when I see a thumb down without explanation.
My best regards.

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By: Humberto

Humberto — Mon, 30 May 2016 17:46:51 +0000

Hi Albert, another good article, you had to undertake a deep investigation. Congratulations.

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By: albert van bemmelen

albert van bemmelen — Mon, 30 May 2016 06:41:41 +0000

In reply to Parasuraman S.

Thank you dear Parasuraman S. The Power Supply tested fine on the ATX Tester, and all Voltages were present as shown in the article. But there is still something odd going on that needs to be examined as it seems that the Mainboard of my friend's son (A big tower of course) a few days later did not start yet. Only the green Mainboard led was on. And I previously already ordered the other controller chips of this 750 Watt Power Supply in case the EST7610 or the FSEM311z need to be replaced. And I ordered another ATX Tester that also gives a decent Load through Bigger resistors to be sure the PSU works under regular circumstances. See this link:
http://nl.aliexpress.com/item/Free-shipping-ATX-power-supply-tester-24-20pin-desktop-computer-load-power-detector-ROHS-certification/719612218.html
And today my friend will bring his son's Big Tower to examine the problem more closely!
So maybe the used ATX Tester is not thrustworthy enough in these special cases? And in these circumstances above new ATX Tester needs to be ordered.

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By: Parasuraman S

Parasuraman S — Sun, 29 May 2016 01:04:24 +0000

Another wonderful and very useful article! Many thanks for sharing!

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By: radley kakubo

radley kakubo — Sun, 29 May 2016 00:39:33 +0000

Hi. I've a problem with my lg dvd home theater ,when I switch on ,on display its only displaying please wait;

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