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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,


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.




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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.
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NC Electronic
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