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Turn tv on hear a click then another click. Nothing after that. Toshiba projection Television Model 46H84

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  • Shakespeer_0 Aug 12, 2008

    Toshiba 46H84 Turn TV on and hear a click then another click. no picture no sound.

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Hi,

The initial click that you hear could very well be a relay engaging. For some reason, the built-in protection circuitry has detected a fault and has decided that to prevent further damage, the system would be shut down, this would be the second click, the relay disengaging.

Diagnosis and eventually repair would require a fair familiarity of electronic components and circuitry, definite use of a DVM and even a soldering iron. A service manual or at the very least a schematic diagram with voltage readings would make the checking relatively easy. Should you be uncomfortable going through this route, then perhaps you would be better off seeking the services of a qualified professional.

If you are considering a DIY (do-it-yourself), foremost to check would be for the presence of the correct voltages from the power supply board. Often defective components could be visually checked such as blistered/bulging capacitors, burnt resistors while others would need forward and reverse bias testing of regulator/transistors.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Aug 12, 2008

  • Louie  Role
    Louie Role Aug 12, 2008

    Hi again,

    Other indicators would be flashing LED lights with a certain sequence to denote most probable area of fault. Along the same line, absence of any led when the unit auto shut down would indicate main power supply switching off (even the standby +5 is missing).


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Variety of power supply or startup problems can result in this or similar behavior. Possibilities include:

  • Lack of startup horizontal drive -The main regulator is cycling on overvoltage due to lack of load.
  • Excessive load or faulty power supply cycling on its overcurrent protection circuit.
  • High voltage shutdown, or some other system detecting an out of regulation condition. However, in this case, there should be some indication that the deflection and HV is attempting to come up - momentary whine, static on the screen, etc.
  • A dried up main filter capacitor or other filter capacitor in the low voltage power supply that is producing an out-of-regulation condition until it warms up. A bad filter capacitor on the output of a series regulator may result in excessive voltage and subsequent shutdown.
  • A problem with the microcontroller, relay or its driver, or standby power supply.
One possible test would be to vary the line voltage and observe the set's behavior. It may work fine at one extreme (usually low) or the other. This might give clues as to what is wrong

Posted on Aug 12, 2008

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Plz send your tv for servicing

Posted on Aug 12, 2008

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