Question about LG 50PG20 50 in. Plasma HDTV
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Posted on Jan 02, 2017
SOURCE: I have a viewsonic N3235W
Sounds like a failed or at least failing power supply / power board
inside the TV.
Unfortunately this is a very difficult repair, and unless you are an
electrician I would not recommend attempting it. You can test the voltage output from the power supply if you wish... that will show if it is indeed the culprit which I think it is. If you don't want to mess with that you will want to
contact a local TV repair person in your area if you are sure this is
out of warranty, more on that in a bit here. This is actually the
most common problem with this type of TV, I see it every day, it just
happens - sometimes with new TVs and sometimes it takes many years for
it to happen.
If you think it may still be under warranty please contact the manufacturer to file an RMA. If you happened to purchase the TV with a major credit card (not a debit card) there is a good chance it may still be under the free extended warranty most credit cards place on electronics. Please contact your credit card company to inquire if they do this, and they will be able to file the claim and get you a refund for the TV.
If you want to attempt the repair yourself please let me know and I will get you the part number and a place you can purchase it from for what you need.
So sorry that I don't have better news but it is definitely a power issue internally. Please reply to my answer here with any questions or comments and I can help you for sure...
Posted on Nov 06, 2010
make sure all screws are out they need a firm pull to open the securing clips in side tv better to pull from hole were stand was
Posted on Nov 08, 2009
Testimonial: "The stand just screwed onto the back, so there was no hole. I was a little more aggressive because u said there were clips, back came off!"
SOURCE: I have a LG MU-42PZ90V
On this model you must replace the power supply if the blown fuse was on the power supply, but the main cause for LG failure is the Y_Substain Board assembly. When measureing the voltage of the Large Capacitors, this is the primary side to the main supply, you must measure the caps form hot ground, on the AC side of the Standby transformer for correct Voltage, 66V is to low. Look at the side of the Lrg Capacitors for their voltage ratings, the Supply voltage to these should be some what near this voltage but never higher. The Y_Substain board is to the left of the power supply standing in back of the unit. Its possible its just the Y_Board gone bad, but in my experience the you should replace them both.
Posted on Dec 03, 2009
In almost all cases where the set is taking a long time to turn on and then turning off it will be the Power Supply board that will have bulging capacitors, usually three to five. Look on the upper right side of the Power Supply and look for any blown caps. You can replace these caps and you will be fine. Now the other cause can be the Power Switch is shorting out. You can disconnect the the Power Switch but not the IR sensor and then turn ON the set with your TV remote and see if this stops the problem. If you are not skilled in component level repair on the Power Supply board then buy a new Power Supply board and install it.
Posted on Apr 16, 2010
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