| Author |
Message |
| jdodd |
 Posted: Wed Apr 22, 2009 3:58 pm Post subject: defective Magnavox 20MT1331/17 |
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| I need to find the value of transitor (7521) for this television. |
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| Hect7369 |
| Posted: Fri Mar 06, 2009 5:34 am Post subject: Re: vertical foldover problem |
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Resistor is good R5343(82k).
Check cap 2465,this fails often.check all surround components. |
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| tjgmore |
| Posted: Thu Sep 25, 2008 7:23 pm Post subject: vertical foldover problem |
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| I'm an old tech and my niece has the same model and problem. what i found without a schematic was a shorted power diode(ref#6463) just left of the flyback(high voltage) transformer. after replacing diode with fast switching cross reference, I still have same problem but new diode is still good. I then found resistor(ref#3543) measured 82kohms but color code is brown,red,black which means it is 12ohm. That is either a misprint or resistor is bad. after soldering board and checking components, i need a schematic to diagnose further. If somebody has resistor(3543) value let me know or I'll have to spend $20-$30 for manual. |
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| kevflanaman |
| Posted: Fri Oct 28, 2005 4:50 pm Post subject: took out main board |
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i took out the main board and I can send you pictures if that help. I apreaciate u halping me man.
thanks, kev |
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| Guest |
| Posted: Fri Oct 28, 2005 2:32 pm Post subject: Re: quick one |
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| kevflanaman wrote: | | Im kinda new to this, exactly where is the vert ic. located? thanx |
I did a search and couldn't find the data sheet  |
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| kevflanaman |
| Posted: Fri Oct 28, 2005 2:31 pm Post subject: quick one |
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| Im kinda new to this, exactly where is the vert ic. located? thanx |
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| fongs |
| Posted: Mon Oct 24, 2005 10:40 pm Post subject: |
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U R welcomed! 
I would try re-soldering the vert. IC 1st... I fixed a Panasonic 21" with similar problem just by doing that.
If that doesn't work, a replacement of the IC and/ or the caps around it is worth a try. Do a google search to look for the data sheet of the IC to identify its pin out. This will tell u which are the caps supporting this IC.
Let us know how it goes...  |
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| kevflanaman |
| Posted: Mon Oct 24, 2005 3:46 pm Post subject: Thanx |
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thanx alot man for the help. that's all i needed to know. Ur the BEST!!!! take care  |
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| fongs |
| Posted: Mon Oct 24, 2005 6:00 am Post subject: |
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Hi,
Sounds like vertical deflection problem.
I would focus on the frame (ie. vertical) IC and/ or capacitors around it. I dunno abt yr TV but alot of them use the vert IC with the "LA7xxx" number. U shouldn't miss it as it is usually mounted on the heatsink...
G o o d luck!!  |
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| kevflanaman |
| Posted: Sat Oct 22, 2005 6:05 am Post subject: any help would be great |
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any help would be great
Thanks guys |
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