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Toshiba 2938xp crt tv vertical deflection fail and i want diagram

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  • srivenkates Apr 16, 2009

    Thanks for your coperation, but vertcal ic is TA 8427 I want sum tips and impartent chek points

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I don't have access to the manuals for your specific model, but vertical failures are usually the result of poor connections at the vertical IC or a defective IC. Look for a small flat IC attached to a heat sink with about 9-11 pins. It may be marked LA7837 or something similar. Resolder the pins first. If that doesnot resolve the problem, change the IC.

Keep us posted,

Dan

Posted on Apr 15, 2009

  • ABRsvcs Apr 16, 2009

    I don't have the schematics, but rarely are they required. If the resolder failed to resolve the problem replace the TA8427 and try again. At that point the vertical should return. It may not be 100% resolves as there are capacitors in the same circuit that fail as well. This would show up as a distorted picture in the vertical direction. Look for caps with values between 47ufd and 100ufd in the same circuit and check or replace them.



    Keep us posted.



    Dan

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I have a thin line in my tv and i dont know what ic no.to replace?


The fault is a failure of the deflection circuit and since you have not specified whether it is a vertical or an horizontal line the section failed will be related to the position of the line.
If horzontal the vertical IC or the section related is faulty and if Vertical the horizontal section., Now this can be the deflection IC, teh deflection coils or even discrete components like capacitors or resisitors in this section which will require a signal trace with a voltage test before the absence of the sync pulses are confirmed and the section identified.
I request not to change the IC unless it is proved but you can solder the vertical IC or the section concerned -- if there is dry soldering.

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This denotes a problem with the vertical deflection circuit. This is more then likely the result of the vertical coupling capacitor failing. You will need the schematic diagram of the TV to find the capacitor in question. it is located between the vertical output stage and the vertical deflection winding of the yoke transformer. In addition check the continuity of the vertical winding of the yoke transformer this can cause the same problem. In any event the problem is that the vertical deflection signal is not getting to the yoke transformer or the yoke transformer is malfunctioning.

I hope this helps,

Thank you,

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http://www.electron-age-technologies-llc.com

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Ed
NC Electronic
Mills, Wyoming

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