Question about Vizio P2 42 in. HD-Ready Plasma Television

2 Answers

I am having an issue with a 42 inch vizio plasma Power Supply

I am having an issue with a 42 inch vizio plasma and cant find the issue, any help would be nice. I will give all the detail I have so far and see what someone can find for me.

Plasma TV power supply is damaged. Board number lj41-05244a, has 3 fuses and one fuse (4AH 250V) is getting 323v so obviously blows. Traced the line back to where the current enters in 2 areas (IN5406) diode (one end reads 96v and other reads 323v) however the higher current seems to come from a small part (331k 1kv) then goes to the Larger Diode middle line (S20LC60US) then runs through 2 capacitors (both 220uf 450wv) then to the fuse. so from the point of IN5406 and 331k 1kv (both are on the same circuit) the v is 323v and stays as such to the fuse, so what is the issue (Diode, 331k or something else?)

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  • ryanmoroz788 May 14, 2010

    No offense is taken, I am planning on ordering another board as well just trying to tinker in the mean time. I dont have much knowledge in it you are right, I am just starting to learn about it all, as someone who has no money for school and time (as i cant stop working and student loans are no longer an option for me) so this is my only way to learn the thing I love, it was no offense though.

    I am aware or what diodes do (basically a one way resistor) and rectifiers change AC current to DC current. I am aware of the basics and just trying to learn on my own.

    Also for anyone that is reading that wants to help, I am getting fluctuating current from 2 resistors that come before the rectifier, flux from 300-700. testing the resistors give me no reading though, will try and change them to see if that helps at all.

    Thanks

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  • Master
  • 1,961 Answers

Ryan good day to you,based on the issue that descrive the problem is obviously on your power supply secondary output.since the power supply use in this kind of circuits is a switching power supply..and your power supply is not switching thats why you got a very high voltage from your filter capacitor which is 323 v..the voltage chopper transformer is not oscillating because you have a problem in secondary of your power supply..try to check your regulator transistor they must be shorted...and check for the open resistors near the regulators there are open transistors in there.replace them all..there is an IC that gives signal to the opto isolator and the opto isolator switches the transformer..you can replace the ic as well as the opto isolator...also there is a MOSPET in there that switch by the opto isolator you can use your multitester to test them..hope this could help you...also check the inverter that supplies the backlight ther might be problem in there that burn your power supply..GOOD LUCK!

Posted on May 21, 2010

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  • Vizio Master
  • 749 Answers

Ahem, forgive me for being upfront...I am trying to help you, not to offend you, so bear that in mind.

Your language is quite non-technical and would be easy to follow; respectively it would be hard for you to follow instructions before first getting some education about diodes, capacitors, rectifiers etc.

And given the apparent lack of experience servicing electronics on your end I would suggest that possibly the easiest way to get your TV up and running is to buy a new power board.

I was thinking of offering you to send me yours for service, but considering you can get a working one on eBay for $70 delivered I don't think it's worth the attempt.

Once you get a working board you can start comparing the two with an ohm-metter and see if you can find which component is faulty.

I am not saying that;'s the best way to do it, of course, but if you want to spend time learning things it's a good way to start.

Posted on May 14, 2010

  • CoppellTVRepair.com May 14, 2010

    I see my own language needs improvement :-)


    What I meant was that your explanation are NOT easy to follow and unless someone is working on that particualr board it would be hard for them to follow.



    Generally, if you have a blowing fuse the first question is if it's the main fuse or a secondary side fuse. Does it blow right after you plug it in or when you load it with other boards?



    If the former then the problem is likely on the primary side of the USPS. Most commonly it is because of a shorted rectifier, but it could be a number of other components as well.



    What you should be asking about is the schematic of the power supply.


    Without it, your chances of getting help are minimal. It's just too time consuming.



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