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Samsung HPS4253 Sound but no picture.

The TV responds to the remote and powers up, the 'on' jingle sounds, and the picture stays black and blank. It will stay in this state for about 20 minutes then it powers itself off. There is no menu nor any sort of screen function. The sound seem to be working fine. Any suggestions or help in where to start or what to replace first?

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  • Axle80
    Axle80 Dec 10, 2008

    So is this a screen replacement? Where is the backlight to be replaced? I started testing the PSB and found a dead fuse, when I replaced it and plugged it in I sent a shower of sparks into the ceiling, the PSB is deffinately cooked now....I'll start by replacing it then move on to the light if you can give me a heads up where it is.

  • Axle80
    Axle80 Dec 11, 2008

    Wait...do plasmas have backlights? I know LCD's do, but after doing a little more research, I think you're wrong. I can't find any mention of a backlit plasma TV....anyone got a clue what I am rambling on about?

  • Axle80
    Axle80 Dec 16, 2008

    SOLUTION!!

    I went back to the source of the problem....the power source, or Power supply board. Using the factory test points on the board, small silver tubes with a hole in the top, about the width of a pencil lead, I checked for correct voltages. The correct voltages are on a sticker on the back of the screen it self, with values like Va and Vsc etc. As I checked the points I found the Va was supposed to be 65 and was reading at 4. I followed the va lines back and thats when I found the blown fuse, and after replacing the fuse, doing a component reassemble, and re-creating the 4th of July in my workshop, I replaced the Main Power Supply Board. Wallaa the voltages returned to normal, all the other boards and LED's went on correctly, I reassembled and the screen fired right up. I am soak testing now on Xbox live. 2 hrs and going strong! I would be happy to help any one else out there with this TV. I ended up replacing almost every board and now know this set inside and out and better than my...well you get the point. Good Luck.

  • photo_beyond Mar 18, 2009

    My power supply seems to be bad. It makes clicking noise and the tv will not power on. How do you check the voltages on the test point? When using a volt meter, what do I set it on? Do I set it to VAC or VDC or something else? I touch the positive on the test point and where do I touch the negative? Do I just touch the negative to the metal frame? When in VDC mode, I get a reading of .395 volts and .190 on the other. Does this confirm that it is bad since it is supposed to read 210 and 63?

  • Axle80
    Axle80 Mar 23, 2009

    Put the multimeter on VDC 200 for all the points except the highest volatge one, which will need the 500 setting. Use the red needle on the board and ground the black one anywhere on the metal frame. Make sure the tv is on when you do your testing, but be really carefull, you could fry a lot more than just the tv. If you can't find the points to test them all, email me and I'll send you pictures or video of where to find them and how to test. Cfoley@hawaii.rr.com

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Your backlight burnt out, this will be a maybe several hundred dollar repair. the screen is backilt by a very expensive flourescent light, without that light, the screen will be black.

Posted on Nov 28, 2008

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