Re: Samsung LA46A950 aka. LN46A950 - intermittent vertical green lines / distortions
Good news - replacement t-con turned up and has fixed the problem, so for anyone else that has a similar issue that was what resolved it.
If you try a solder reflow try to do a better job than I did!
Thanks again Davi for your advice!!
265chemic
Member
Last Activity: 06-16-2022, 06:46 PM
Joined: 01-02-2020
Location: Brisbane
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Re: Samsung LA46A950 aka. LN46A950 - intermittent vertical green lines / distortions
Glad to hear that! I will update once it arrives.Leave a comment:
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Re: Samsung LA46A950 aka. LN46A950 - intermittent vertical green lines / distortions
A lesson for the future, that is for sure.
I just hope that hasn't caused issues upstream/downstream, and that the new t-con, once it arrives, resolves all issues. It is said to have been tested and is out of a unit with a cracked panel.
Do you think there is likely to now be other issues outside of the t-con?Leave a comment:
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Re: Samsung LA46A950 aka. LN46A950 - intermittent vertical green lines / distortions
Thanks, I didn't consider the weight; I guess that might flatten solder out too much, maybe causing bridging.
What is the 'destructive popcorn effect'?
I don't suppose at this stage it is worth trying again?Leave a comment:
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Re: Samsung LA46A950 aka. LN46A950 - intermittent vertical green lines / distortions
Hi Davi / All,
Unfortunately no good news - I tried a reflow but now the t-con board makes a high pitched noise from the main IC and the TV won't turn on ( fast flashing red led after backlight , as if the board isn't plugged in ).
I did modify the procedure from what you suggested in a couple of ways though, I first tested the process on an old GPU with a aluminium block 80x50x5mm I got the IC to move and cooled off okay. I used a thermocouple to monitor temperature up...Last edited by 265chemic; 03-25-2022, 07:59 PM.Leave a comment:
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Re: Samsung LA46A950 aka. LN46A950 - intermittent vertical green lines / distortions
Thanks again Davi!! I will see if I can find some aluminum plate and get some flux grease and give it a go.Leave a comment:
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Re: Samsung LA46A950 aka. LN46A950 - intermittent vertical green lines / distortions
Thanks for the reply David! So you don't think this is likely to be a panel issue?
I've never done a reflow (at least in no capacity more than just baking a board in an oven for some time) so a little daunting. Do you have any detailed guides you might be able to recommend?
I believe I may have located a compatible t-con board for ~$50 also, so that could be an option if necessary.Leave a comment:
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Samsung LA46A950 aka. LN46A950 - intermittent vertical green lines / distortions
Hi All,
I have a Samsung LA46A950 that intermittently was displaying issues with evenly spaced vertical green lines only on dark / black areas - this has progressed to more often and blue lines sometimes, as well as a little image distortion.
My initial suspicion was the T-CON board, which I took out and cleaned but the issue persists. A heat gun on all of the control boards makes no noticeable change. Ive also reseated the T-CON to panel ribbons (4 of them) and moving them while the panel is on doesn't seem to change the issue.
Below are some photos... -
Re: DC Ceiling Fan Motor Controller / receiver
After testing the cap I attempted to resolder it back - it escaped my tweezers, shooting off somewhere into the ether.
That said, out of interest I reinstalled the controller and it worked after sitting switched on for 48 hours or so. Does this give any more certainty the cap was at fault? Is there a way I can find a replacement without having to measure one off the good board? From some research it sounds like the size plus voltage may be indicative of capacitance in general, is that right? It's from a 15v...Leave a comment:
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Re: DC Ceiling Fan Motor Controller / receiver
Yep, the 'good' board runs the 'bad' fan just fine. One of the first things I did to make sure it was isolated to the board.
U4 is a IRMCF171 - [URL="https://www.infineon.com/dgdl/Infineon-IRMCF171-DataSheet-v01_01-EN.pdf?fileId=5546d462533600a40153567246602737"]https://www.infineon.com/dgdl/Infineon-IRMCF171-DataSheet-v01_01-EN.pdf?fileId=5546d462533600a40153567246602737[/URL]
I've included a better picture too.
My next steps were;
...Last edited by 265chemic; 01-16-2020, 08:13 PM.Leave a comment:
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Re: DC Ceiling Fan Motor Controller / receiver
I checked all 3 0.5ohm (R500) resistors between VRU,V,W and ground - they tested okay.
Thanks - I'll check this next as well....Last edited by 265chemic; 01-16-2020, 03:56 PM.Leave a comment:
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Re: DC Ceiling Fan Motor Controller / receiver
I will check that out next time I pull it down
I did try that - no difference observed...Leave a comment:
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Re: DC Ceiling Fan Motor Controller / receiver
I've never swapped out an IC that size before, with the little pins and many contacts. What happens with the hidden contacts underneath? I assume there must be a method for doing so - what would be the typical way to tackle replacing something like that?...Leave a comment:
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Re: DC Ceiling Fan Motor Controller / receiver
Thankyou - I haven't though the 'bad' board cap tested okay and had a good ESR. That would typically be something worth trying though would it, even if testing says okay?...Last edited by 265chemic; 01-15-2020, 03:08 PM.Leave a comment:
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Re: DC Ceiling Fan Motor Controller / receiver
Thanks - I haven't tried hot air yet, though I do have a heat gun so will give it a go next time I pull it down. The controller is currently working again in the fan (after being left on for some time) but next time the switch is flipped we're back to non responsive ill bet....Leave a comment:
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Re: DC Ceiling Fan Motor Controller / receiver
Thanks - Apologies - I've tried hosting them differently this time;...Last edited by 265chemic; 01-14-2020, 12:06 AM.Leave a comment:
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Re: DC Ceiling Fan Motor Controller / receiver
Thanks - Apologies - I've tried hosting them differently this time;...Leave a comment:
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DC Ceiling Fan Motor Controller / receiver
Hi All,
I'm having a problem with a DC ceiling fan controller (from a Mercator Trinidad fan). This operates via a remote. The light works fine, as does re-pairing the remote (an audible beep is emitted). The fan function itself however does not. This leads me to believe the issue is more than likely with the DC power control part of the circuit. I have another known good controller for comparison.
When it first started having issues - and this might be key to forming a theory from someone more experienced than I - it initially wouldn't work until after the AC isolator... -
Re: New Members - please post your introductions here
Hi All,
Joining to further my knowledge of electronic repair - I hate seeing otherwise okay items go to landfill for what is often a <$5 component!!Leave a comment:
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