Tip & How-To about Televison & Video

So you want to fix your own TV?

Ok so you want to service your own TV, well i will briefly describe what you may need. First and foremost you need a Service Manual, why you may say? well if not for the troubleshooting algorithms, and component placement. The MOST IMPORTANT thing is that these manuals give us the PART NUMBER that identifies EVERY component and part in the TV. Without this number you simply cannot order parts, as there is no way to describe what you need, without it.
You need a Good Multi Meter.
You need an Isolating transformer if you do not want to kill yourself.
You may like to make a pair of switchable out, 100 Watt light bulbs wired in series in the mains circuit, to "Buffer" the Voltage and so you can work on hic-upping switchmode power supplies.
Ideally an Oscilloscope. at least 100MHz. Dual Input. & 1:1 & 1:10 Probes;
Tools, include, Torx drivers, Philips, Slot, Small Side Cutters. Long nose Pliers, Tweezers, Soldering Iron, 40 Watt fine Conical Tip. Solder, De-soldering Pump.. Various "Solder Picks". Small Dentists Mirror and Magnifying glass.
Also a Dual Output Power Supply, proves invaluable.

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Request a service manual directly from Westinghouse.

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The fault is with internal circuit board itself. Without its schematic and service manual, it will be very difficult to follow. Even a technician wishes to repair this set, he also need its service manual. Being a combo, the circuit will look somewhat complicated. But in the service manual, all are well described. OK.

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model no:22LH20R no display but sound ok


Hello Mr Ajayan
It seems that there is no Mstar LDVS output. This output comes out from [IC100] on main board. It seems that you have knoledge in electronic equipment service. I've the service manaul for this LG TV. It is very difficult to describe and type all of the fault finding table here with this window. If you send your email address to me by Fixya comment box, I'll send the service manual to your Tv by return Email. It has all the details, schematics, boards, voltages, troubleshooting table etc:- If the IC i stated above is faulty, you may have to replace the main board of the TV.
By the way, may I ask you where are you from now. From your name itself I can understand that you are an Indian, a Keralite. Are you from Kudappanakkunnu, Trivandrum. If not take this easy. OK.

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another step is to press menu on remote and menu on tv at the same time..

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1 Answer

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Buy a service manual for this car first and foremost. There are several possible problems. One is the fuse. Another is the flasher, or it could be a bad switch or blown bulbs. You can check the bulbs easy enough, but you'll need a service manual (at any part store) to find the flasher.

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