Question about Philips Magnavox 20MT133S 20" TV

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The TV keeps going on and off without anyone touching it.The only way to stop it is to turn it off at the mains.

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Check it again may be it is blinking ,how long it stays before it gets turn off ?

Posted on May 12, 2010

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Posted on Jan 02, 2017

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The tv just turned off and the power botton blinks


you tv has two boards inside a power supply one and a main one so the main one its the one controlling all your imputs picture and sound too manufacturer and tv repair guys waste of money go to www.shopjimmy.com search your tv and model for the main board. The price you r going to be satisfied without complaint.

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We have a 18 month old Panasonic plasma HD tv 46 inches. Without anyone touching anything, the tv will start turning the volume all the way up and then the channels start flipping. We've had the A board...


I know it sounds silly, but try changing the batteries in the remote.

Sometimes when the batteries are going dead they cause the remote to send random commands to the tv.

You may want to do the same thing with other remotes in your house.

If it works great, if not, it only cost a couple of dollars to try...

Good Luck!

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1 Answer

Lights up 3 times then nothing


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2 Answers

LG 42LG5 TURN ON TV PICTURE GOES BLACK


This could be 1 of a few things here. Without opening up your set and trying to look at voltages or indiciator lights I couldn't tell you exactly without some more info.

Without looking at it myself here are my thoughts and where I would first look at.

It may be a main board because:
1) Main board processes all your audio/video signals. Bad main board means bad video processing. Could do that. Especially if the main board is not sending the right signal or a bad signal to the rest of the boards so they don't do their jobs. 

It may be a power supply because:
1) Power supply is well, the power supply. If it's sending inadaquete voltage to the main board you may not be recieving enough juice to keep that main board doing your video processing or further up the line keeping enough juice flowing to your TCon board to keep it telling things where to go and what to do. The power supply sends voltages to your Ballast board(controls your lights) and to your main board through which power is supplied to your TCon board via a LVDS line and a +12/+16V signals. If the power supply isn't pumping out enough juice to keep the TCon or Main Board running, it could be a problem. By the same token it could be that your P/S isn't sending power out to your ballast board. 

It could be a TCon because:
1) If the TCon is bad, you won't get your pictures. This could be the TCon board itself or the LVDS cable from your TCon to your Main. However, with few exceptions, if it's a bad TCon you're looking at a total panel replacement. 

It could be a ballast board because:
1) The Ballast Board controls the lighting behind the LCD screen. If this isn't working right you won't be seeing much of anything without that back lighting. If this is bad, it's a panel replacement. These are not field replaceable items by LG. 

Based on the symptoms, without more data or a eyes-on view of it, I would say you're most likely looking at a Main Brd or PSU problem. 

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1 Answer

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