Question about Sony KP-61V90 61" Rear Projection Television

2 Answers

A chip on the circuit board started smoking

I was watching my tv when the picture went out and i smelled smoke so i unplugged the tv and opened the back. There was a small peace on the circuit board that had started to smoke when i plugged it back on. I am not sure what that peace controls or if it is possible to replace. I cant find any breakdown on what parts are what. please help

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  • 10 more comments 
  • micluccha Jan 01, 2009

    I seen smoke coming from the main circuit board in the back of the televison, It looked smoke was coming from I think a fuse. it is a small black square that was attached to a metal plate. On the black piece it had 1ohm on it

  • micluccha Jan 01, 2009

    the earliest i can send a photo is Monday

  • micluccha Jan 01, 2009

    it was the board on the left. d-2578

  • micluccha Jan 02, 2009

    D2578

  • micluccha Jan 02, 2009

    where would i find the IHVT?



  • micluccha Jan 02, 2009

    how can it i test it to see if it is working correctly, I have friends who has a background in electronics. He has a voltage reader. to test it if that is all that needs to be done. If so what voltage should he look for?

  • micluccha Jan 08, 2009

    the varistor behind the resistor was fried and when taken out I could not read the number off it to order a replacement one. When looking at the skematics can you tell me what type of varistor to order.

  • micluccha Jan 09, 2009

    replaced the horizontal output transistor(D2578) and the varistor behind it. Now the power light blinks four times then goes off. Then it repeats, blinks four times goes off. The screen will not come on. What could be the problem?

  • GreyMatterSF May 11, 2010

    I don't understand what a "small peace' is. There is no such phrase in English.

  • cyriacus joseph May 11, 2010

    what part got burnt?

  • Henry McKelvey
    Henry McKelvey May 11, 2010

    Hello,

    If possible can you post a picture of the board and the component that was smoking? This will be a great help in seeing what is happening.

    Thank you,

    Shuttle83

    http://www.electron-age-technologies-llc...


  • acdcsl8r
    acdcsl8r Aug 21, 2012

    ^Being a **** doesn't help, go be useless somewhere else.

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The part which is black and is mounted on the metal plate is the horizontal output transistor (D2578) The part which is 1ohms is a resistor In order to replace, you need to get the location number which is written on the circuit board -for example Q552 could be the location number for the transistor
To get the correct part you have to call sony the manufacturer and give them the name of the tv
the model number of the tv
and the location number of the burnt part
Please refer to a qualified tv repair personnel to do repair on tv

Posted on Jan 02, 2009

  • cyriacus joseph Jan 09, 2009

    check vertical output ic

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  • Master
  • 1,139 Answers

The component sounds like a resistor, and the fact that it was attached to a heat sink means its a power handling resistor. You said it was burning, so this means that whatever it is attached to is drawing too much current. From what you are saying a component on a board is drawing too much current and is causing another component (the 1 ohm resistor) to burn. My question is what board is this (I am suspecting the deflection or the HV power supply). Please post a picture of the board in question. That way I have a visual guide as to the board and if I can find the schematic, or if you can supply the schematic I'll be able to at least give a better diagnosis of this problem.

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

Posted on Jan 01, 2009

  • 6 more comments 
  • Henry McKelvey
    Henry McKelvey Jan 01, 2009

    Hello,

    I have the schematic on file, now what I need from you is a picture of the board and the component, post it here and send a copy to service@electron-age-technologies-llc.com.

    Thank you,

    Shuttle83

    http://www.electron-age-technologies-llc...


  • Henry McKelvey
    Henry McKelvey Jan 01, 2009

    Hello,

    when you took the back off of the TV which board was the smoke coming from? The board on the left of the board on the right (facing the rear of the TV?
    This will let me know if it is the G board (left side) or the A board (right side).

    Send me this ASAP. It will help me locate the possible problem faster now that I found the schematic in my archives.

    Thank you,

    Shuttle83

    http://www.electron-age-technologies-llc...


  • Henry McKelvey
    Henry McKelvey Jan 01, 2009

    Hello micluccha,

    can you give me the resistor number from the circuit board ( The number should be R) i.e. R587 or something like that.

    I am currently looking at the schematic and might be able to localize the problem.

    Thank you,

    Shuttle83

    http://www.electron-age-technologies-llc...


  • Henry McKelvey
    Henry McKelvey Jan 02, 2009

    Hello,

    If the HOT (Horizontal Output Transistor) is the problem, I would also suggest checking the IHVT (integrated High Voltage Transformer), since what is puzzling is that that if the HOT has shorted the the current should have also opened the IHVT since it did not the IHVT might be shorted, as cycus suggested if you do not have a background in electronics you should get a qualified TV technician to work on this set for you.

    Thank you,

    Shuttle83,

    http://www.electron-age-technologies-llc...


  • Henry McKelvey
    Henry McKelvey Jan 02, 2009

    The IHVT is the biggest component on the G board. It has a large red cable coming from it. It is also referred to as the FBT (Flyback Transformer). This component should be tested and replaced if needed by a qualified TV technician, due to the voltages present on the anode of the CRTs during removal of the HV cable from the transformer.

    Thank you,

    Shuttle83

    http://www.electron-age-technologies-llc...


  • Henry McKelvey
    Henry McKelvey Jan 02, 2009

    Hello micluccha,

    To test the IHVT you will need to perform what is called a ring test, if you friend has equipment to do this then it poses no problem. However, make sure your friend tests the Horizontal Output Transistor, the IHVT, and the associated circuitry.

    I hope this helps,

    Shuttle83

    http://www.electron-age-technologies-llc...



  • Henry McKelvey
    Henry McKelvey Jan 08, 2009

    Hello,

    The part number is 1-801-073-31 which is marked as a critical part so you have to replace it with an OEM part. You must contact SONY's Parts Department (go to the SONY web site and look for technical support) give the following information:

    Model Number: KP-61V90
    Board Designation: G
    Reference Number: VDR601
    Part Number: 1-801-073-31


    I hope this helps
    Thank you,

    Shuttle83

    http://www.ekectron-age-technologies-llc...

  • Henry McKelvey
    Henry McKelvey Jan 12, 2009

    Hello

    check the vertical output IC (IC1509) and or the vertical pulse buffer transistor (Q1505).

    Thank you,

    Shuttle83

    http://www.electron-age-technologies-llc...


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