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Vestel 11ak36a15 no vertical deflection

Hi! I have no vertical deflection on this crt tv. I have 33V present on R816 but I don't have the 26V in TDA8174 pin 10. I've been checking all the resistors and capacitors but found nothing so far... All the voltages from the power supply seem to be good. Can anyone help, please?

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  • Rui Moreno Oct 31, 2012

    BTW the tv shows a single horizontal line in the middle of the screen

  • Rui Moreno Nov 04, 2012

    Thank you for your reply.
    No breaks found and IC is checked and good. (Also tryed a brand new IC)
    No voltage is reaching the IC. Could a bad capacitor cause this??



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Check the track for any brake. Check the resistance between 10pin and 6pin. If IC is short, you can determine it by this check. Vestel 11ak36a15 no vertical deflection - tda8174-pinout.jpg

Posted on Nov 01, 2012

  • 1 more comment 
  • Rui Moreno Nov 04, 2012

    Thank you for your reply. No breaks found and IC is checked and good. (Also tryed a brand new IC) No voltage is reaching the IC. Could a bad capacitor cause this??

  • The Knight
    The Knight Nov 05, 2012

    Can you follow the schematic diagram? You have to find out the reason for the absence of voltage to vertical output IC. For that, you must have some knowledge in electronics. Have you? Without having knowledge in electronics, you can't follow the schematic diagram. It is the blueprint of the set. Are you sure you can? Just see, this work is not as easy as replacing a fused bulb in a holder. Understand this at least. As I understands by now, from your responses, you are nothing in electronics. If you are confident, inform me. I'll send you the schematic diagram for this set. If you are not confident, please don't waste my time and effort. Contact any experienced service technician. OK?

  • Rui Moreno Nov 05, 2012

    I do have knowledge in electronics and in servicing. I probably sound illiterate on this subject because I am totally lost with this set. I have repaired several tv sets, radios and other electronic appliances. But I confess I am somehow lost with this set. The diagram I have for this chassis doesn't match the PCB (diodes in place of resistors, etc etc). I do not intend to waste your time nor mine.



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SOURCE: tv cuts off 10 seconds after switch on and destroying vertical output ic

If the main IC is not putting out a vertical drive signal then the vertical output will not do anything and therefore will not be damaged. What exactly do you mean by the set "literally eats deflection IC's"? What is the number on the vertical output IC? I will bet that your pump-up cap or pump-up diode is defective.

Posted on Jul 05, 2007

  • 93 Answers

SOURCE: JVC AV-27020 TV Blinking LED, Static Electricity on tube but no sound and image

in jvc av-27020 we called that problem as on timer.your red LED indicator blinking.the reason is your vertical ic is defective if your vertical ic is la7832 replace it with la7840 if there is no la7832.that is most common cause of blinking in jvc 27020

Posted on Oct 18, 2007

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Hello yyimerr1,

This is a vertical deflection problem, These are the possible causes:

1) bad vertical coupling capacitor
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Troubleshooting needed:
1) using the TVs schematic locate the driver IC the output IC and the CRT yoke transformer.
2) using an oscilloscope look at the vertical driver signal it should be a sawtooth signal from the driver to the yoke (increasing in amplitude for each section, i. e. driver and output).
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4) replace the components

Now let me tell you something, don't continue to play the TV with the line present with brightness applied, this will burn the image of the line into the phosphorous coating of the CRT.

I hope this helps

Thank you,


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