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Toshiba 3418DA Reduced field scan to approx 4 inches, no picture information just a few flyback lines. Everything else seems ok.

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  • Bill Warriner Jul 31, 2008

    The Toshiba 3418DA is a CRT television, not a projection TV. Please search your database for an answer to this problem. Cheers, Bill.

  • Bill Warriner Jul 31, 2008

    This is not the solution in this case.

  • Bill Warriner Jul 31, 2008

    Thanks Jaime, I was thinking the same. (The lines are in the centre of the screen) I had already started on the caps but was hoping for a more specific remedy to save time rather than a blanket change as I am not familiar with this model. From past experience these faults tend to be common to isolated components so thats my reason to try FixYa. Cheers.

  • Bill Warriner Aug 01, 2008

    I have found the problem, it was as I first suspected a leaky capacitor. For the rest of you techs it was C374. Thanks for your comments, Cheers, Bill.

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What u need to do is get a multimeter and check the capacitators one of them will be faultiy

Posted on Aug 01, 2008

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Hi

you have defective vertical ramp, this is capacitor that is 10uf 35volts and check the vertical filter capacitor that is 1000uf 35volts

Thanks!

Posted on Jul 31, 2008

  • carlos fernandez Jr.
    carlos fernandez Jr. Jul 31, 2008

    the most important you know how to check the capacitor in multimeter! check first before you replace!

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Are those lines on the top part to the CRT?
If they are, you might have dry or leaky capacitors in the vertical section of your TV. I would suggest to look a 7 or 9 pins IC mounted on a heatsink and change the capacitors with values between 1uF and 100uF and possibly a 1000uF.
I do not have the service manual to give the exact info on the locations of the capacitors.

Posted on Jul 31, 2008

  • Jaime Hernandez Jul 31, 2008

    I would say that without the schematic diagram, it can be a challenge to troubleshoot it even for the most experience technician.

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You can also try a hard reset: Unplug TV from AC mains and remove all cables from TV. Wait about 30 minutes and replug to AC power and redo the cabling. Switch on the TV and see if it works..

3. Powering down the set or putting it in standby may have allowed the power supply to cool. Weak capacitors often go out of spec when they cool, thus preventing a section of the power supply from firing up properly again. There is a simple trick...just warm the back of the TV with a hair dryer for 5-7 mins after you have unplugged the TV. Look for the little areas of holes in the back panel of TV. Use these as your guide at where to use the hairdryer, but don't hold the dryer too close (say 5-6inches away). (Make sure the dryer is on High heat). If the TV doesn't turn on after you have heated it up (like it tries to come on but then turns off) you need to unplug the TV again, this resets it. And repeat those steps till it works. Resetting the TV after it fails to turn on is the key.

Posted on Jul 31, 2008

  • Anand Kumar
    Anand Kumar Jul 31, 2008

    If you would like to attempt a DIY, you will need a service manual to guide you. You can find one here:
    http://servicemanuals.vstore.ca/



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Is the audio coming from the TV's?

Posted on Jul 31, 2008

  • Legin Varghese
    Legin Varghese Jul 31, 2008

    Take out the comb filter and replace the surface mount electrolytic capacitors (I think there were around 4 of them) on the comb filter and put it back in the motherboard. MCM sells a kit If I'm not mistaken with capacitors that fix this problem as well as the picture in picture problem which these same sets have.

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