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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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3 Answers

No picture,good sound


If everything else works - there is sound and high voltage (static on the screen) - but there is no picture (including no on-screen menus), this limits the likely area of problems is the video output circuitry or CRT filament connections. Check to see if the CRT filaments are glowing. If they are not glowing, check for bad soldering on the CRT neck board and around the flyback transformer. Where the picture is erratic - coming and going entirely or changing brightness suddenly, with power off, remove the picture tube socket (carefully!) and clean the pins with fine sandpaper and use contact cleaner on the socket. This source of bad connections can result in a variety of erratic symptoms. Check for bad solder connections on the CRT neck board

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I have a 27 inch panasonic and have about 19 real thin lines across the top of the screen. It is in the top 4 inches of the picture tube.Model CT-2701G Built 9/03


Scan coils (field) measure about 5 to 15 Ohms from the plug where they connect to the main PCB
Look for the cables that come down from the scan coils (deflection yoke) to the main pcb
its either two cables and two plugs or a 4way cable with one plug to the main pcb
2 of the wires goto the vertical(height) and 2 to the width
try to work it out which (the fattest wire is width)
The width ones go towards the loptx(line output/flyback transformer),
and the height ones go to the field output chip (or transistor pair) Follow the printed circuit from the plug and look for a 7 or 9 pin chip on a cooling plate(heat sink for the posh),
it should have a diode connected to it and about 25v on both ends of the diode.
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1 Answer

You have to tap firm sides of the Toshiba TV in order to see a picture


Hi Jaime.
Well it seems you have a dry joint or loose connection somewhere
in or to this receiver. Faults of this nature may at first seem straight forward but they can be very frustrating and often send you on a wildgoose chase.
The most valuable tool you posses will be patience and if you are still reading this then this virture in you is onfirmed. So let us continue.
We first need to narrow down the suspect area where the problem may be hiding. You say the picture is intermittent so I'm assuming
you still have sound. If you still have a raster (brightness on the screen) then the line oscillator, line drive, line output and EHT circuits are all functioning and your attention should be drawn to the composit video circuits in particular dry jionts on the rca video input socket your a/v cable is connected to (it's the yellow one)..
If you have only a blank screen did the disappearing picture
go to a horizontal line across centre of the screen just before going blank. If yes then the problem probably lies in the
frame output stage. Resolder all pin connections to the frame output ic (even if they look ok) and all pin connections on the flyback transformer (Line output transformer to some of us).
If the picture fades away rather than flashing off then look to see if the tube heaters are still glowing, If not resolder the heater pin connections on the tube base socket and all pins on the flyback
transformer. Stll haven't cured the problem ? Have a nice cup of tea before poceeding, you've earnt it by now.
OK once more into the breach dear friend, it's time to get violent
with this stubon beasty and start tapping the circuit board to find the most sensetive area and resolder all the joints you can find within a two inch radius of this point. The most common points for dry joints to occure are in the power supply, line output stage and
frame output stage (vertical stage to even more of us)
Good luck Jamie. Best regards from Vintie

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