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Sanyo dp46840 lcd tv,, Tv power led will turn on but no pic or sound,, i checked main fuse and cap's on psu, is there a problem with this model#?

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  • Matthew Albert
    Matthew Albert Mar 25, 2011

    This is a LCD!! The power led stays blue when power is turned on,, as i posted in my first post i checked all the cap's on the power supply..

  • Matthew Albert
    Matthew Albert Mar 25, 2011

    this power supply has the light ballast on the same board,

    Any known proublems with this tv?

  • Matthew Albert
    Matthew Albert Mar 25, 2011

    this tv has been unpluged for a few weeks,, what should i look for on the power supply?



    I got 120 ac coming out the plug, but at Fuse1 its only 61 AC? this is not right is it? what would do this??

  • Matthew Albert
    Matthew Albert Mar 25, 2011

    nvm i tested the fuse to the boards ground,, i get 120 ac when i tested it from plug to fuse

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  • Master
  • 1,126 Answers

Your main TV processor is locked up, unplug from wall for 40Min, and it will rest back to normal.
If that don't work, then you have power supply problems.

Posted on Mar 25, 2011

Testimonial: "ty"

  • Veril Gillette
    Veril Gillette Mar 25, 2011

    Yes I know what type of TV it is, try to reset or replace power supply.

  • Patricia Mitchell
    Patricia Mitchell May 11, 2012

    I've replaced the power supply 3 times and it hasn't solved this problem. The first time we figured the replacement board was defective so we exchanged it; but that one didn't work either so we exchanged it again. Still no luck with the 3rd board. We are looking for other possible solutions to this problem.

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  • Sanyo Master
  • 6,993 Answers

Hello,

is the power led on the TV red. If yes, then it means the TV is having a power problem. It not that there is a problem with the model but electronics cannot be relied upon 247. Power entering into the TV most times is what damages the TV.

This issue described is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board.

I do not think it needs replacement, rather some defective capacitors are causing this issue.
Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors).
After replacing these capacitor(capacitors) most likely the normal operation will be restored.

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

I hope this helps.

Good luck.

Posted on Mar 25, 2011

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Posted on Jan 02, 2017

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voltage on to the main 3.3Volt regulator IC202 it should be bang on more or less
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J Williams
www.jvsvisual.com

Unfortunately I'm not very technical so now I will need to find someone to do this for me...

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