20 Most Recent LG 42PX4DR 42 in. Plasma TV Questions & Answers

Fault to the main power supply regulator section. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

there is no passord,go to settings and find reset to factory and click on it

Probably failed capacitors in the PSU. It is an easy fix for someone who can solder.

I suspect its a component (Capacitor) aging and eventually would need to be replaced. How do you have it connected? Is there a cable box or Direct TV receiver that you use to display TV Channels? If 10 years old does it even have an HDMI input? Should be very happy you got 10 years of life out of this Plasma. My thoughts is that it would take more to repair this than to purchase a new LCD or LCD/LED thinner TV. Plasma does have the best color but the LCD and LED TV's are much lighter/take less energy and are much brighter. Good luck.

You have some dried out capacitors on the power supply. Samsung has a major issue with this right now and I made a tutorial for that repair in my Tips & Tricks. Your capacitors will not be the same, but identifying them and replacing them will be. Best advise I can give you: Stop using the TV and unplug it until you get it fixed. When these caps go bad, they draw down the voltage they are filtering. I've seen some TVs that had secondary damage because of this. I hope this was of some assistance, best wishes.

Was it a display unit? If so its burn and you can't get it to go away Try to reset the unit by holding your Menu button for 8 to 15 seconds with the TV on. If this doesn't work then you'll most likely have to have the screen replaced. Check your serial number and see how old it is. First number is the year it was made. Next two are the month. so 911 is November of 2009. They find out what your warranty is. If its near the in warranty terms you stand a chance of LG taking the lead on fixing it for you for free or reduced cost.
Thanks,
Shawn

possible power supply issue

This is a how long is a piece of string question. You don't provide any details and expect an answer. All things can be fixed. On average problems like yours ( No picture) cost about $800 to fix if the sustain and power boards are involved. But in this case it's all guesswork

Thanks for using FIXYA

Normally this defect is due to misadjusting of PDP module voltages, these must be setting according to the sticker specification attached to on the back of PDP module

Y Sustainer problem. However, normally they have to change both Y Sus and Z Sus boards at the same time. If you lucky than it's just a fuse on the Y sustainer blown (the chance is very rare) otherwise the IPM (Intelligence Power Module) on the Y/X sustainer board is short. more then likely if you can get the IPM off of the board you will see that the components are shot, that is the popping noise you heard. shopjimmy.com has these boards some are cheap some are not...good luck

While it could be a power supply problem, I doubt it. The best way to know would be to disconnect the leads (plugs) that output from the power board I suspect the voltages will come up and be stable.

What I have seen in several sets like this is the problem is the "main" with all the micro surface mounted chips. On several I have been able to with the back of get a small high speed fan against this board (the large flat pack chips) and see the set suddenly stay on and work.

This is not a cure--just a way to see if the problem is there. The set is shutting off/on because something is pulling the voltage down or not correctly giving commands.

See attached photo---it should be what the board in the model indicated looks like.

All of these sets it is a matter of trying to determine which board the problem is on and then cross your fingers and REPLACE it to see what happens--not much actual "parts" replacement is possible.

The only thing to also look at is that NONE of the filter caps on the power board are puffed up on top etc---

MOST OF THE TIME THIS KIND OF PROBLEM IS CONTROL RELATED AND NOT POWER SUPPLY.

Look at the picture and let me know what questions you have.

SD TECH

It's caused by a poor connection betwwen the screen and the rear circuit board. There is a conductive rubber filler which is used to bridge the connection and it can move off line. You can sometimes sort it by GENTLY flexing the casing.

What do you mean by digital meltdown? Are you experiencing tiling? Meaning is the picture slowing down and getting squares all over the picture.