Question about Protron PLTV-4250 42 in. LCD Television

4 Answers

Lost power completely

Unplugged power cord and plugged back in- no red light or green light.... nothing

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  • ucdawn Jul 10, 2010

    protron pltv-4250 lost power completely..... no green light no red light...... unplugged and re plugged power cord, nothing

  • ucdawn Jul 10, 2010

    protron pltv-4250 lost power completely...... no red light no green light..... tried unplugging and replugging in..... tried rebooting power cord..... nothing

  • ucdawn Jul 10, 2010

    everyone is saying that this is a supply board problem- we are having issues getting the back of the tv off to even check this...... lost power on Protron pltv-4250- no red light no green light.... nothing..... tried unplugging and replugging.... tried rebooting surge protector... nothing

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4 Answers

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  • Master
  • 10,594 Answers

If you are comfortable with working in tv circuit boards then unplug tv from AC wall socket, take off back of tv and follow AC cord going inside tv that will take you to power supply board, check fuse on power supply board, replace it with same rating written on it if it found blown.
Replug tv back in wall socket and check if it turns On.
If still problem not solved then power supply board is defective and need to be replaced.
Local tv repair shop will help you if you think its not safe for you to work inside tv.
Hope these info will help you.
Thanks.

Posted on Jul 10, 2010

  • Shahid Electronics
    Shahid Electronics Jul 10, 2010

    OK, thanks for rejecting assistance but thats they only way that I told you to fix your tv issue.



  • Shahid Electronics
    Shahid Electronics Jul 10, 2010

    Unplugging and replugging wont fix your tv problem, it got hardware failure for some reason and need to be checked.

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  • Master
  • 1,476 Answers

You could have a blown fuse but that is very rare these days with switch mode power supplies. Certainly I would check that first along with making sure you have power to the unit. If this all checks out ok I have a tip at http://www.fixya.com/support/r4606286-troubleshoot_dlp_tv which explains how to troubleshoot a dlp unit. Let me know if you need more assistance.

Thanks for using FixYa and for the great rating.

hardrocko

Posted on Jul 10, 2010

  • Kim Yearick
    Kim Yearick Jul 17, 2010

    Seems like you have plenty of people who want to help but aren't saying anything new or anything I haven't already suggested. The problem is not always going to be the power supply and these days almost never the fuse. I had a unit last week which had your syptoms and had a bad scaler board (control board) and a good power supply. TVs these days are quite complicated and when there are no lights it does not immediately mean the power supply is bad. It also does not eliminate the power supply as the problem.



    This is where some training or background in electronics would be helpful. Bulging caps have been a problem for many years, more often now with Chinese imports, but knowing that does not make you an electronic tech. You need to know how the circuits work.



    If you have no power I would suggest my tip at http://www.fixya.com/support/r4606286-tr... first to try to resolve the problem. If you have already been there as I suggested then here is your best approach.



    Check the fuse (main) if OK. Look for bulging caps and replace. If none or you replace them all and it will not power on check the outputs of the power supply with a DMM, with the unit hooked to an isolation transformer, check for + and - 5 volts, + and - 15 volts and probably + and - 24 volts. (keep in mind that I cannot put my hands on your unit and I am only making my best guess as a qualified electronic tech.) Personnally at this point I would have an idea if the pwr board was bad or not. If you don't think it is working order one from http://www.encompass.com . If this does not solve your problem then order the control board from the same company.



    This should get your unit running.



    If you need more help let me know. Thanks for using FixYa.



    hardrocko

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  • Master
  • 8,619 Answers

Hi


Thanks for using FixYa. From what you have described it seems the issue is with the power board or the main board and we’ll need to check few things. When you open the unit up; take a look at the power board-the board where the power cords/plugs goes into. You might see some filter capacitors a little bulged up in the top-If this is the case-this is your defective part(you can try to replace them-but some soldering equipment is needed). If not, then probably the main board has gone bad. This is the other board-where all the inputs are going into. All this is only recommended if you have electrical expertise and know how to solder/re-solder components. Please note that the TV components consists high voltages even when in off position. Please do accept the solution if the issue is resolved or post a comment for further assistance.



Thanks
Rylee

Posted on Jul 10, 2010

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  • Protron Master
  • 6,993 Answers

Hello,

your TV is having a power problem. The power board is defective, that's why there is no power on the TV. Also, do not overlook the power plug. The power plug may have been bad. Do a thorough diagnosis on the power cord in order to make sure power is entering into the TV, before you check for other causes of the problem.

Get a screw driver, open the TV cover to gain access to the power board, check for any blown fuse/bad components.

You need to get a meter, read the power board of the TV, in other to detect the bad component (capacitor, diode, transistor etc.), make necessary replacement and the TV should power up again.

The fault is mainly a power problem, so the power section of the TV needs to be diagnosed.

Good luck.

Posted on Jul 10, 2010

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