Question about LG 42LH20 42 in. HDTV LCD TV

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My LG TV won't turn on. Model #: 42LH20... I've had it for about a year and a half with no problems. One day I tried to turn it on and since than it won't go on. The TV doesn't light up at all. With remote or directly pressing the on button. I've taken the power cord from my other LG (same tv) to see if it would help but it didn't matter. The TV is not responding to power. Is it the TV? What is it?

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Perhaps an easy fix. Remove the back of the flat screen. There will be a main circuit board visible. There will be several capacitors, cylinders with a cross hatch on the silver top. Do any of them look like they have a dimple created by expansion of the internal capacitor material over heating? If you see an expanded top...that's probably your problem. Get your solder gun out and replace that capacitor. You can order a new one off of Amazon. If yours is a 10 volt capacitor, consider replacing it with a 16 volt unit. Generally the electronics companies under design the size of these units. When you replace the capacitor take note of the silver band on the unit and where its placed in the two socket holes....there is a positive and negative hole placement.

Posted on Jan 03, 2011

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Posted on Jan 02, 2017

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What causes vertical lines in right half of the screen


If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

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I just fixed this problem on my friend's a couple of days ago. It is indeed the tcon board. It does not need to be replaced though! I just took it apart, cleaned the grounding connections with isoprol alcohol, and double checked all connectors. Turned it on and it worked great! I hope this helps yours and anybody else's problem! A lot cheaper than sending it in for repair. Don't try this if you're inexperienced at fixing electronics though. There are some high voltages built up in the power supply.

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1 have a 6 year-old Mitsubishi model WS-48511 series 1080 rear projection TV that now won't turn on. A few days ago we shut the TV off, and now when i plug it in the blinking green power light...


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First: remove front speaker grill (IT PULLS OFF) AND remove inspection plate behind it; look for the two bundles of wires coming down and to the right from the front keyboard of the set.

Unplug both plugs you find (different and marked so you cannot mix them up-----the idea is to take the front keyboard out of circuit-----set will still function with remote as receiver is behind front screen)

Try (after 70 seconds) to turn on with remote

If it comes on---defective reset button on front keyboard----use set only with remote or remove and remove actual reset switch---it is located behind and part of frame for screen----entire front screen would have to be removed to get at it.

Second: if disconnection of the front keyboard does not help, the DM unit is bad.

As you look from back of set it is large metal box at extreme left side.

The blinking light is the unit trying to "Boot" up-----these have a problem where caps and a few other parts in that unit fail-----kits on the net are available----Mitsubishi no longer sells or services these units but PTS Electronics does repair them.


Let me know if you have questions and try disconnection of the front keyboard FIRST.


REGARDS, SD TECH

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Tries change the tv projection lamp.Tv projection lamp ben in the tv like 1 1/2 or 2 years already,tv watches daily 4 or 5 hours every day.Yes.Than the tv projection lamp life are ended,now tv require a new tv projection lamp replacement.

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I have an LG 42LH20. I and a friend were messing with the advanced setting to try and get the usb service only port to work for other devices. We changed tool option 2 and tool option 3. Yesterday after...


It sounds like bad timing...the TV just happened to fail while you were messing with it.

There's a good chance you have failing electrolytic capacitors either in the power section or the inverter section or both.
Any caps in these sections that look bulged at the top, or bulged/leaking at the bottom need to be replaced.

If you aren't tech savvy, this unit needs to go in for repair.

If you are handy with a soldering iron and can identify the power supply and inverter / FM section for the backlights, an inexpensive handful of capacitors will likely fix you right up.
Match the capacitance on the capacitors. Go over voltage if you can, and still have them fit.
IE - it's not a bad idea to replace a 10V cap with a 16V, but don't replace a 680uF cap with a 500uF or a 1000uF (unless you are positive it's only doing ripple filtering).

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1 Answer

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Why did you accept the session? Contact our support team to revert the rating or we can communicate through this thread.

Sai.

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