Question about Protron PLTV-4250 42 in. LCD Television

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Pltv-4250 post I saw your post on repairing the 4250, I need to replace the power plug on mine, but I can't seem to figure out how to get the back cover off. All screws are out, base is removed, but something is holding it still, any suggestions? Procedures? Thanks

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  • D B Jan 18, 2009

    I have the PLTV 42 inch and amg new to Fixya, my TV is having the power issue also. Power light turns on green then red, sometimes orange. Could you send or direct me to the link to that post on how to fix the problem.

    Much appreciated

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YOU NEED TO INSERT A FLAT BLADE SCREW DRIVER BETWEEN THE PIECES AT THE TOP OR BOTTOM EDGES. THERE IS A LITTLE EDGE ON THE INSIDE OF ONE PIECE AND A SLOT ON THE OTHER PIECE THAT LOCK THE 2 PIECES TOGETHER. EVERY 4 TO 5 INCHES THERE IS ANOTHER LITTLE LOCK PIECE.

Posted on Jan 16, 2009

  • Anthony Gonzales Jan 22, 2009

    PEOPLE, IF YOU SET IS NOT TURNING ON BUT THE LED COMES ON, IT IS NOT YOUR POWER PLUG. YOU HAVE A BAD BOARD INTERNALLY. A SERVICER IS REQUIRED TO DETERMINE WHICH BOARD TO REPLACE.

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Hi,

A downloadable copy of the manual for a Protron PLTV-4250 is available here.

I went through it to check up on your concern. It was mention in page 34.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FIXYA.

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4 Answers

I have a Flat screen TV Proton 42'' only 1 year 1/2 old


Protron PLTV 4250- wont turn on-
Had the same problem with one here- The 110v end of the power supply board was found damaged, The following items may need to be replaced:
Fuse F1 (soldered in) . 6.5a @250v time delay
Mouser 576- 021506.3HXP – note this style is for a fuse holder instead of solder in- I added a fuse holder on the board
RT4 & RT5 inrush surge suppressors - I used shintron 8d-18 power suppressing thermistors
BD1 bridge rectifier - Mouser 627-D15 XB 60H Shindengen

If you want a little more protection modify the board as follows:

1.replace only RT5 in its original location & move RT4 into the other ac input line in front of the bridge rectifier. (cut trace & drill solder holes)

2. Add: MOV (metal oxide varistor) across ac inputs of bridge rectifier.
Maida mdc-z481-8oul or D69 ZOV 481 RA 105
This arrangment is copied from a samsung power supply.

Be careful when plugging in the I/O box on the outside cover, if any pins are inadvertantly bend loss of picture will result.

I have pics if anyone needs them .

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3 Answers

Protron flat screen tv


Protron PLTV 4250- wont turn on-
Had the same problem with one here- The 110v end of the power supply board was found damaged, The following items may need to be replaced:
Fuse F1 (soldered in) . 6.5a @250v time delay
Mouser 576- 021506.3HXP – note this style is for a fuse holder instead of solder in- I added a fuse holder on the board
RT4 & RT5 inrush surge suppressors - I used shintron 8d-18 power suppressing thermistors
BD1 bridge rectifier - Mouser 627-D15 XB 60H Shindengen

If you want a little more protection modify the board as follows:

1.replace only RT5 in its original location & move RT4 into the other ac input line in front of the bridge rectifier. (cut trace & drill solder holes)

2. Add: MOV (metal oxide varistor) across ac inputs of bridge rectifier.
Maida mdc-z481-8oul or D69 ZOV 481 RA 105
This arrangment is copied from a samsung power supply.

Be careful when plugging in the I/O box on the outside cover, if any pins are inadvertantly bend loss of picture will result.

I have pics if anyone needs them

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4 Answers

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remove pwr board--inspect and you will find a heavy current diode which has eatin its solder pad area--if diode checks ok,repair it's connection.Install board and hook back up.Check for shorts in circuit.Cross fingers and plug her up------good luck

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