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Old 01-23-2017, 05:13 PM   #501
Venomus28
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Default Re: Problems with Samsung 740N monitors

After changing both mosfets the monitor turned on and worked right for about 10 mins then it the back light turned off again
What could it be ?
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Old 01-25-2017, 01:28 PM   #502
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Default Re: Problems with Samsung 740N monitors

Did a resolder and all works perfectly now.
Thanks
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Old 01-26-2017, 01:19 AM   #503
capmo
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Exclamation Re: Problems with Samsung 740N monitors

Hello everyone, My 740N gets the power but doesn't stay ON for long. I turns ON for a fraction of a second and then OFF and that keeps happening. The power LED(on the button) keeps blinking while the display is OFF.
The display does function correctly as when it does turn ON for that fraction I can see everything working fine.

Before this happened, from past few weeks/month ago it used to take 5-8mins for the display to turn ON. I should have tried to fix it that time.

When under warranty few years back I think I had a similar problem not sure but that time the Samsung guys had replaced 2 CapXon capacitor(2x1000uF 10v)So I am guessing the rest are the terrible CapXon and might be the problem?

What is the first step to know what I need to replace? I haven't opened mine yet and checked for bulged capacitors, but I have already bought all the required capacitors from local shops. (from the reference/manual/ebay listings available online)

My soldering experience is minimal and I have never done any capacitor-PCB soldering that was this critical, hope it goes fine.

Thank you for the help.
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Old 01-26-2017, 03:15 AM   #504
jondoe
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Default Re: Problems with Samsung 740N monitors

Open, take pictures, share with the whole class.

If you can use a soldering iron without stabbing yourself in the eye or setting fire to yourself, you should be fine to do the caps. Take your time.
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Old 01-27-2017, 02:36 PM   #505
Venomus28
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Default Re: Problems with Samsung 740N monitors

i think that the caps are bad, open it up and see for any bulged one
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Old 01-28-2017, 01:57 AM   #506
capmo
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Default Re: Problems with Samsung 740N monitors

Quote:
Originally Posted by jondoe View Post
Open, take pictures, share with the whole class.

If you can use a soldering iron without stabbing yourself in the eye or setting fire to yourself, you should be fine to do the caps. Take your time.
Thanks for the vote of confidence.

Attached are some images.

Quote:
Originally Posted by Venomus28 View Post
i think that the caps are bad, open it up and see for any bulged one
Was my first guess, but not sure.
Attached Images
File Type: jpg 1.jpg (1.24 MB, 20 views)
File Type: jpg 2.jpg (962.5 KB, 16 views)
File Type: jpg 3.jpg (2.14 MB, 17 views)
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Old 01-29-2017, 04:22 AM   #507
jondoe
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Default Re: Problems with Samsung 740N monitors

Yep, those purple ones don't pass the flat top visual inspection, get those changed with some good ones. Change the blue ones while you're at it.
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Old 02-01-2017, 08:04 PM   #508
Venomus28
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Default Re: Problems with Samsung 740N monitors

Change only the bulged ones, fire it up and see how it goes
My guess is a working monitor
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