Re: Another SAMSUNG 2493HM !
It was measured, out of circuit, and returned a value of 12 nF....
Leonrsa
Member
Last Activity: 12-06-2022, 02:24 AM
Joined: 03-25-2014
Location: KZN
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Re: Another SAMSUNG 2493HM !
I found the following...
Line voltage - 205VAC
450V Cap - Standby - 290VDC
- On - 390VDC
Seems to be OK
...
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Re: Another SAMSUNG 2493HM !
PSON, Off - 0.12V, On - 3,2V
Replaced caps, still no image. Blue light comes on. Can someone please suggest the way forward?Leave a comment:
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Re: Another SAMSUNG 2493HM !
Hi budm, I am afraid I did not measure the voltage on PSON as I have put the monitor aside until new caps arrive. I was informed that the caps I used (Hitano) as replacements 3 months ago were bad and not ESR. I have ordered the best (in South Africa) low-ESR caps I could find, being Rubycon YXF series, and will report back on progress.Leave a comment:
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Re: Another SAMSUNG 2493HM !
I did replace all the small caps about 3 moths ago, but it seems that the caps were GP Hitano. The salesman assured me that they were the correct type for the job...
I was under the impression that all the electrolytics had to be low-ESR?
This is the list I obtained of caps to be replaced:
Qty (2) 1000uf 35v
Qty (1) 2200uf 10v
Qty (1) 470uf 35v
Qty (1) 1000uf 10v
Qty (2) 10uf 50v
Qty (1) 2.2uf 50v
Qty (3) 47uf 50v
Qty (1) 22uf 50v
I will try and find caps of the make as listed...Leave a comment:
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Re: Another SAMSUNG 2493HM !
I will try and obtain the correct low-ESR caps, and replace them all(again). Will report back whether the problem has been solved...Leave a comment:
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Re: Another SAMSUNG 2493HM !
The cap was measured and checked out to be correct.
I am however worried as I am getting a reading of 294VDC across the big cap - the testing point there indicates that it should be 380V, with nothing but the AC cable connected. Am I correct in assuming the problem appears to be on the Hot side? Which components should I check out?
Ok, I connected all but the inverter board and measured 380V on the big cap, but still no 24V...
Where should I go from here?Last edited by Leonrsa; 03-29-2014, 03:50 AM.Leave a comment:
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Re: Another SAMSUNG 2493HM !
Correct, I do not have 24V out. I will have the cap measured. And clean off all the glue....Leave a comment:
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Re: Another SAMSUNG 2493HM !
Hi budm, quite difficult to scrape the glue off! Is there a way to soften or perhaps dissolve it?
I have no way of measuring capacitance, should I replace the cap(CM812)?
Incidently, the voltage on the big 450WV82uF cap is 292Volts. Is that within spec?...Leave a comment:
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Re: Another SAMSUNG 2493HM !
Yes they are Hitano. Are those bad caps?
A search of the list of bad caps on this forum for Hitano came up blank...
It did come up on the good caps list though....Last edited by Leonrsa; 03-28-2014, 10:56 PM.Leave a comment:
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Re: Another SAMSUNG 2493HM !
I hope these are clear enough....Leave a comment:
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Re: Another SAMSUNG 2493HM !
I replaced the 2 caps and cleaned off the glue. The monitor now seems to be completely dead. No image using the torch test, and obviously no backlighting. Only the glowing blue light...Leave a comment:
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Re: Another SAMSUNG 2493HM !
Hi, I am new to the forum so forgive (or reprimand) me if I am out of line!
I have the same dark screen but an image is visible via the torch test. I will be replacing the 2 470uF caps on the inverter board and report back. The caps on the power supply board has been replaced 3 months ago, but the problem came back...Leave a comment:
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