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#1 |
Badcaps Veteran
Join Date: Feb 2009
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![]() Hi
I have a typical lcd tv poeer supply I dropped the board snd the magnets on the dc transformer broke off Is the board no good now? What is purpose of the magnets mounted on both sides of transformer |
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#2 |
Badcaps Veteran
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![]() There are no "magnets" on a transformer, I think you are referring to the transformers ferrite core. Why not post a picture?
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#3 |
Badcaps Veteran
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![]() Thanks
Cant tske a pic Here is stock photo Pieces in yellow broke off Will ps not operate now? |
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#4 |
Badcaps Veteran
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![]() The power supply will likely still operate, but the transformer will not operate efficiently as the core is broken and its drive circuit will likely fail when the supply is under load.
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#5 |
Badcaps Veteran
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![]() Thanks
Is there anything i can do with the broken pieces to fix it or no I guess ill put it back in tv and see what happens. |
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#6 |
Badcaps Veteran
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![]() You can try fitting the pieces back but they would not be magnetically conductive like when they were originally. If used like that I suspect the transformer could run hot as well. It would be best to replace it if you can find one from another board, maybe one that the board is beyond economical repair but the transformer is good.
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#7 |
Badcaps Veteran
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![]() thank you
this is not worth repairing as it is just a tv i found in trash i dont put money into tvs anynmore..not worth it lcd tvs are worthless nowadays ill just glue it together and see if tv powers on..if it does ill just leave it as is if it no power on ill just toss tv in trash |
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#8 |
Badcaps Veteran
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![]() hi JR
i glued the ferrite back in place as best i czn with super glue i did test the ps outside of tv i do get 5v standby so i assume tv ps will porb work but as you said for how long i really dont care for how long since the tv is just a project tv..i dont use it so tomorrow i will install it in the tv and see what happens |
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#9 |
master hoarder
Join Date: May 2008
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![]() Keep us posted what happens.
The glued core should work, so long as you didn't increase the gaps too much. If it works, also put some silicone glue to hold the core together. Superglue does not deal that well with heat-cycling and may eventually crack. So to prevent the core from cracking, silicone glue is recommended to hold everything as a "backup". |
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#10 |
Badcaps Veteran
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![]() Hi...i did superglue it and tv powered on fine as i expected
The unknown is how will it affect long term use...i dont usecthectv so ill never know When you say silicone what area are you referring to? Can i just incase the entire ferrite perimeter in silicone? And is it just 100% pure siliccone caulking or a silicone based heat resistant glue? |
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#11 | |
master hoarder
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![]() Awesome, good to hear you got it working!
![]() Quote:
I've used regular cheap silicone caulking (they type used in bathrooms) with pretty good results so far. Only thing to watch out for is to make sure to get one that is low VOC / low odor. As silicone cures, it may release acetic acid, which can sometimes corrode electrical contacts and metals. The low VOC / low odor stuff, IIRC, releases a little less of that so it's overall safer for electronics. I don't suggest encasing the entire transformer / ferrite with silicone, as that may reduce its cooling ability. But adding a good layer over the areas where the cracks were should work fine. Last edited by momaka; 01-29-2022 at 05:09 PM.. |
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#12 |
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![]() Look for it indicating neutral cure for a non acetic acid version.
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#13 |
Badcaps Veteran
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![]() Thanks for the good info but
Its just a cheap lcd tv Ill just use 100% silicone caulking i have on hand.. If it was something expensive or something i was going to keep long term i would use more appropriate silicone but its just a typical modern day crappy made lcd tv so Thank you |
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