Question about Toshiba 36A50 36" TV

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TOSHIBA 36A50 HORIZONTAL LINE WHEN TV IS TURNED ON

I have the circuit board out and need to know which chip, and location, to replace or repair. I can flex board slightly and tv will work properly
Thanks Bob bobby_mnrd@yahoo.com

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If flexing the board will "fix" the problem, then the most likely issue is poor solder connections on that board. Look for any connections that appear grainy or have rings and resolder them. The IC involved here is the vertical IC which will be a small flat IC attached to a heatsink. It may be marked LA7837 or something similar and have about 9-11 pins.

Try the resoldering and update this with your results.

Dan

Posted on Mar 04, 2009

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Toshiba, 36A50 picture is a thin white line. Can this be repaired?


Yes...this TV may be repaired. The line you describe is in the center and is horizontal across the TV. You will need to resolder the vertical IC pins. This vertical IC is mounted on a large heatsink. Under the board you will see there are 5 or 7 pins that will have rings around them. Resolder these. And you should replace two or three capacitors that are next to this IC. A bad cap will overheat an IC and separate the solder grounds. If you can find my expertise page on this website, you will see the repair in more detail. Thanks for asking and show a few hands of support.

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It is my guess that you have some intermitent solder connections in the Vertical output circuit.
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Apr 15, 2009 | Toshiba 36A50 36" TV

1 Answer

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This is usually due to bad solder connections to the vertical output integrated circuit. Because the part gets pretty hot during operation, the connections can degrade over time and cause the loss of picture. The solution is to resolder those connections. It's an easy job if you have some experience with electronic soldering. The hardest part, especially in a big set like yours, is getting the circuit board out and flipped over to access the solder side. Also, some parts in a TV can store possibly lethal charges even after it's been off for a while.

If you want to try it yourself, the output IC is mounted on a metal heatsink near the middle of the circuit board. I haven't faced one of these in a while but I think the part location marked on the board for this is IC401. Resolder the connections to the pins of this part and it should restore your picture.

If you have some doubts about trying this yourself, you might consider calling a servicer in your area and get an estimate for a repair call. The shop I used to work for charged around $90 for this kind of job, including the trip charge, but this is a number of years ago.

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Ok, The vertical Ic is IC301 Ta8427K And Capacitors around IC chroma 2.2 uf 50 volts. You will see small red capacitor ( with C302....4 or 5 ) reference. Replaced others capacitors on vertical section 220 uf 35 V or 100uf 35V. I hope this can help you. Or if do you have any picture chasis, send to me and I will show you where are the problem., Thank you

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  • the problem is most common & simple to repair at your home only at minimum cost by skilled technician.
  • as per problem is concern it is due to electrolytic capacitor failure in vertical output stage.
  • hope this will help
  • good luck.

 

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1 Answer

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THE PROBLEM IS IN VERTICAL OUTPUT CIRCUIT MAYBE DAMAGE SOLDER CRACKS

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you'll need to replace bad capacitors on the vertical circuit stage , no expensive but you need the basic knowledge, and the tools to do it your self , if not . you need a tech depend on the tech 60 to 80 dls a shop 125

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