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My father-in-law has given us an 8 year-old Toshiba 36ZP18Q TV. It worked perfectly at his house but refuses to work at ours! We get power through but no sound or picture. Nothing else is connected up to the TV. The green 'timer on' light flashes but that is the only activity. We've read through the user manual and followed the advice but to no avail. It's difficult to change menu settings, etc. without a picture! Any help would be greatly appreciated.

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  • maz40 Apr 16, 2008

    Yes - the flashes are intermittent. Could you explain in layman's terms what you mean by marginal joints please? Are these the connections on the circuit board? Many thanks.

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  • Master
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Can you count the flashes or is it just continuous? If you knopw how to solder, try resoldering any connections that appear to be grainy or have rings. The move could have broken a couple of margnial joints.
keep us posted.
Dan

Posted on Apr 16, 2008

  • ABRsvcs Apr 17, 2008

    Yes, the marginal joints are on the main board. Any physical movement can jar loose these connections if they were marginal to begin with. Please note that these connections get this way not because of abuse, but because of heat/cooling cycles normal to TV operation. There are a few cables and connectors inside that may be a bit loose as well. Check those too for proper seating.



    As far as the video signal goes, the set should give you either a blue/blank screen or snow depending upon how it is set up. Try hitting the menu button, you should see the menu if the video section if functioning correctly as that does not involve an external signal. The menu is generated inside the TV.

    Keep us posted.

    Dan

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  • Master
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HI,

Do you hear any click sound?

ONE: The protection circuit is shutting the set down when you turn it on - to avoid further damage to the set.

TWO: The reason for the shut down is due to the protection circuit detecting excessive current in one or more sections of the tv.

THREE: The clicking sound is the ON relay getting shut OFF by the protection circuit. The thumping sound in the speakers is from the power supply coming up in voltage a little, and then shutting down.

FOUR: Number one reason for auto shut down in big screens is loss of high voltage. Number two is defective deflection amplifiers (horizontal or vertical amplifiers).

FIVE: These repairs are not something you can do at home; they require the service of a trained tv tech.

A Toshiba of this age is very marginal as to whether it is worth the repair investment. May be better off applying the money towards a new set.

Goodluck,
Please don't forget to rate the solution.

Posted on Apr 16, 2008

  • Priya darshan Apr 16, 2008

    I also want you to cooperate with Benimur.I believe he can help you more with this.

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  • Master
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Hi,

A couple of possibilities:
1. While in transit, something must have jarred loose internally;
2. your post "...Nothing else is connected up to the TV..." might be causing a video/audio mute, have you tried connecting an aerial or cable to it?
3. try do a reset. Unplug the unit from the mains for a couple of hours and try again.

If problem persists, please try to determine if there is a sequence to & the number of times the "...green 'timer on' light flashes..."

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 Apr 16, 2008

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Check the cord and if fuse in line input is blown.

Posted on Apr 16, 2008

  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos Apr 16, 2008

    There may be a loss of sync to the scan circuits, or there may be a response problem in the video path, thus not allowing proper sync.

    You would have to get the service manual, and trace through with a scope to see where this type of fault is. Also, checking for the proper supply voltages in the various stages would be a proper thing to do.
    If you are not trained and equipped in TV service, I would suggest to have the set properly looked after.

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You need to check the voltage input

Posted on Apr 16, 2008

  • Maanita Chadha
    Maanita Chadha Apr 16, 2008

    May be your father in law has a different rating of voltage at his place 110 and 220 volts are the choices may be you can check at the back of the tv whether it has a sliding switch.

  • Maanita Chadha
    Maanita Chadha Apr 16, 2008

    Its gonna be a good move if you can hire a technician and get it installed by him.

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TOOLS: #2 Philips Screwdriver, Wire Cutters, Soldering Iron, Desolder wick (with Rosin), Rosin Core Solder, Replacement parts (will be determined after disassembly).

The first thing we need to do is unplug the TV and move it to a good work location. You will need a soft place to place the TV, perhaps on a carpeted floor or on a blanket placed over the kitchen table ;).

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Remove the 4 screw for the stand (RED area) and then pull the TV off the stand and place the TV face down on you soft work surface. Remove the 4 large screws (GREEN area) and the rear cover screws (YELLOW areas). Now remove the rear cover (screw location may vary depending on your exact model, so please make sure have them all out first).

Depending on your model, you may have a metal shield covering the boards. If not, you can skim ahead...

964b551.jpg
There are 2 major boards that will be front and center inside your TV. On the left we have the SMPS... this is where we will be working. So, we need to remove the shield cover to get to it.

070b424.jpg

Now that we have the cover off, we are able to take a closer look and locate the faulty parts. Have a look at the upper right corner of the SMPS (Switch Mode Power Supply). You will see a cable going over to the main board on the right... in this area you will find the problem.

686d45d.jpg
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Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

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Thank you for using FixYa.

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