Re: Samsung UN50JU6500F; Blown NTC thermistor
I replaced the cracked up NTC and so far TV works like new.
Thanks for your help everyone.
yyzmxs
Member
Last Activity: 12-08-2018, 05:33 PM
Joined: 04-20-2018
Location: Morava
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Re: Samsung UN50JU6500F; Blown NTC thermistor
Got it. So I guess I will go ahead and order a couple of those Amphenols a go from there.Leave a comment:
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Re: Samsung UN50JU6500F; Blown NTC thermistor
So, that was my initial question .... the larger diameter is not a concern as far as functionality.What's the wisdom here .... the larger footprint, the better heat dissipation?Leave a comment:
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Re: Samsung UN50JU6500F; Blown NTC thermistor
The Ametherm is only good for up to 7A, stock was 8A, isn't that a concern? Epcos is even lower 6.5A .......Leave a comment:
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Re: Samsung UN50JU6500F; Blown NTC thermistor
Pics are attached to the thread now....Leave a comment:
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Re: Samsung UN50JU6500F; Blown NTC thermistor
I can try that ... so the links I posted last time don't open the pictures either?Leave a comment:
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Re: Samsung UN50JU6500F; Blown NTC thermistor
How about clicking on these links? Does it work?
[URL="https://drive.google.com/open?id=0B0z_2GUcs-7BTk9kQ3djMEhQSmFpQmFQVHJaV240a2g1SW80"]Back Cover[/URL]
[URL="https://drive.google.com/open?id=1CAUJctb7Ymq3VHcjKI3BMqNcf1qTUZCs"]Complete power board[/URL]
[URL="https://drive.google.com/open?id=1hPPeEWa7aMNzdGMXsNvBMcImIVQKC5Ye"]Power Board Model[/URL]
[URL="https://drive.google.com/open?id=0B0z_2GUcs-7BVHl0aXgwQ2RkVjZFY0o2TUhSbzdXd0tDM1cw"]Damaged...Leave a comment:
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Re: Samsung UN50JU6500F; Blown NTC thermistor
That's odd as far as pictures ... is this site not compatible with Google Drive pics sharing?Leave a comment:
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Re: Samsung UN50JU6500F; Blown NTC thermistor
I took a couple more pictures of the board ... It's BN44-00807A...Leave a comment:
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Re: Samsung UN50JU6500F; Blown NTC thermistor
Well the other one measures about 3.5ohm at 21C. Shorted semiconductors ... you mean like diodes, transistors etc.?
You think replacing it, is a good chance it will blow right back up again, eh?Leave a comment:
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Samsung UN50JU6500F; Blown NTC thermistor
Hi guys,
a neighbour offered me his TV which stopped working, since he knows I like to tinker.
First obvious visual red flag, as a plastic bulging on the back over, not too far from the plug ... I immediately think, something blew up on the power supply board. Here's the pic ....
After I removed the cover (pic below), I am looking at where the bulge is and see obviously one of the green NTC thermistor guys hurting. Using voltmeter to measure ohms, obviously I get out of range figure.
So here are my questions...Last edited by yyzmxs; 12-02-2018, 05:43 PM. -
Re: APC Back-UPS 1300 not charging battery
Missed your last paragraph ... yep that seems to be holding me back regarding the rectifier. Will have to keep reading, until I figure it out. Would the lowest D number generally be considered diode 1 and highest diode 4?
Thanks for your help, I appreciate it.Leave a comment:
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Re: APC Back-UPS 1300 not charging battery
Yes it was 12V DC without battery connected (I have to start it with battery connected, but then I disconnected the battery and that's when I got 12V DC). With main cap out, there was nothing nothing on red and black to battery.
I will put the main cap back in now.
How do I measure the input/output of the rectifier? I am staring at those four diodes, but cannot measure any meaningful voltage regardless where I put the probes ... where do I measure exactly AC and where DC voltage, using your previous picture asa...Leave a comment:
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Re: APC Back-UPS 1300 not charging battery
That's right, with UPS plugged in. Yeah, it doesn't make sense at all. I am taking out the new main cap I soldered in, just to make sure I have a good connection. Since the cap is out from the circuit, what reading should I be able to get on the board where the main cap goes? In theory, with the main cap out, I should have zero voltage on the red and black wires going to the battery, correct?Leave a comment:
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Re: APC Back-UPS 1300 not charging battery
Something silly like -1.6mV ... regardless whether I switch the probes around.Leave a comment:
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Re: APC Back-UPS 1300 not charging battery
The bridge is giving me fits ... just figuring out where the current flows from to ... learning curve I guess. So I have not figured out how to measure the input and output voltage of the bridge ... I mean I know that in theory when the bridge is a drawn box or inline with four prongs ... whole different ballgame when staring at the board.
Having said that, I think the rectifier has a problem. How do I know? With power off, measuring with my meter individual diods across in diode mode ... I get on 1 and 4 exactly the same 0.475V...Leave a comment:
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Re: APC Back-UPS 1300 not charging battery
The bridge rectifier on this board ... and I am using reference image from post 31 ... I see the four diodes, but where exactly should I measure 230V? ... I have seen the typical diode rectifier with two outside DC legs and two inside AC legs .... this one is above my pay grade ... LOLLeave a comment:
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Re: APC Back-UPS 1300 not charging battery
The problem is that the board has a lot of small caps, so replacing them one by one could lead to lottery type of fixing things.
At this moment, could you confirm that what I am finding even makes sense? Perhaps I am not doing something right (which is very possible) ... main cap measures basically 0V, yet output cap shows 24.02V? Doesn't that indicate problem upstream? To newbie like me it makes no sense that I have 0V on main cap, yet 24V on output cap?
Whatever is happening right now on the board, leads to 12.02V...Leave a comment:
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Re: APC Back-UPS 1300 not charging battery
Hi folks,
I came across your forum when looking for troubleshooting advice regarding my APC 1300 .... it simply doesn't charge the battery.
I read through this thread in detail several times, so hoping I understand it right.
When I opened the unit up, I noticed the main 22uF cap having bulging top. So I got a replacement (they didn't have 22uF 400V, but they insured me that 22uF 450V would work just as well, as long as I can accommodate the slightly taller footprint) and installed it in. But...Leave a comment:
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