Question about Zenith B25A02Z TV

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Set wont turn on

When I turn the power on I can hear little clicks which indicate its on but nothing happens

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  • ajerry333333 Jan 16, 2009

    what do i do about the flyback???

  • ajerry333333 Jan 17, 2009

    After taking the back off, i tried to see where the clicks were coming from but I saw nothing, I unplugged the speakers from the board just to insure that the sound wasn't from there, it wasnt. And another thing....I have to unplug the set and replug in order to get even the clicks because once i turn the set on....the power button wont work anymore. so i have to unplug it to try again.

  • ajerry333333 Jan 17, 2009

    you;ve spooked my wife talking about high voltage and death....so i'll just junk the set and get a new one. thank you for your help

  • kidpimp11 Feb 24, 2009

    i have 36 inch zenith tv it wont turn on but when i press the power button i can hear it click each time i press the power button but i dont get no picture or sound

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  • 107 Answers

^.^ hi..
I see that your TV's high voltage flyback is leaking out.
or the flyback cap to the CRT aka picturetube is dirty, or it has a open insulation.
(Warning: Flybacks are extremely dangerous, it has a high voltage that kills. becareful.)

Posted on Jan 16, 2009

  • 1 more comment 
  • Mark Payas
    Mark Payas Jan 16, 2009

    As what I said this is a very high voltage and could kill even when it's plug is not connected or turned off.



    but if you are willing to do, well I'll provide you how to do the job.

    First open the TV.

    Then check where the sound comes from.

    By turning it on and observing the unit.

    If you have found where is that sound comes from.

    Reply me what you see and hear, discribe it as what does it look like.

  • Mark Payas
    Mark Payas Jan 17, 2009

    hmmmm....

    ok... maybe the click that you hear is coming from a relay that switches the unit on.

    and try to resolder your unit.

  • Mark Payas
    Mark Payas Jan 17, 2009

    sorry about that sir.

    TVs are really dangerous because of their high voltage. so fixing them needs caution.

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Turn off itself and wont turn on. There is a noise, when you plug in. Click, click


Your description indicates that the power supply has failed; the noise you are hearing is probably caused by a relay that is interrupting the AC supply to avoid damaging the supply any further or causing a fire.
Disconnect your set from the wall and allow several hours (overnight is better) so that dangerous voltages have a chance to discharge.  You will have to gain access to the lower section of your system to look for a separate board with larger components on it, some cylindrical (capacitors), some block-like (chokes and transformers). If you can locate this board, it should be user replaceable.    

The next step would be to look for unique markings on that board looking like an assembly number. With that in hand and the model number of your set, look for the RCA service center in your area and call them to determine whether they have a repair or replacement assembly.
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The green light indicates that it is getting power from the outlet ok.
The clicking is the power relay trying to turn it on but there is an internal fault forcing it to shutdown. You either have a power supply problem, horizontal output transistor (HOT) is shorted or a bad flyback transformer. In any case it can most likely be repaired by a qualified technitian. If it is the flyback it may be expensive.

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Hello zang,

 

This denotes a problem with the switching power supply or the high voltage power supply. what is happening is the safety relay is being actuated by the shutdown circuit. Any number of things can cause this proble but more then likely the problem is in the high voltage power supply section and or its associative circuitry. The switching power supply and the high voltages power supply have very dangerous voltages and I would not suggest that you work on the TV set unless you do have a background in electronics. If you do not I would suggest that you take the TV set to an electronics shop for repairs. If you do have a background in electronics, you will need the following items:

 

1) A schematic diagram (to know where voltage and signal test points are located and to have a reference of the levels.

 

2) A multimeter (to measure the DC voltage levels on the TV Set)

 

3) An oscilloscope (to measuer the AC voltage and signal levels in the TV set and compair them to the values in the schematic)

 

4) A signal generator (to generate a reference signal for troubleshooting)

 

I hope this helps,

 

Shuttle83

 

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1 Answer

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How many times does the light flash, as there is a code that can give an indication as to what circuit is bad.

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