Riddled TV Repair Forum

ntehicks · Joined: 25 Mar 2009 Posts: 162 Location: Herriman, Utah

I have an emerson LC320EM81 lcd tv that turns on for a few seconds and then turns off. I can smell something burning. I have opened the back and can see a plastic connector that connects to one of the six high voltage transformers is melted and kinda black. does this mean that the transformer is bad or is this caused by arcing and just melts the wires. I have also notice that other wires are kinda black. looks like they are starting to arc or something. Is there a way to test these transformers. I understand they are one of the main problems with this tv.

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ntehicks · Joined: 25 Mar 2009 Posts: 162 Location: Herriman, Utah

kuhurdler · Joined: 28 Dec 2006 Posts: 2879 Location: Overland Park, KS

looks like the inverter board. You may be able to get away with cutting those leads and soldering them directly to the board. If not, you'll probly have to replace that PCB and the bulb that is arcing.

ntehicks · Joined: 25 Mar 2009 Posts: 162 Location: Herriman, Utah

I thought while I was cleaning up the burn't platic I would test some parts. the big white resistor on the top left of the picture labeled R501 part number 5WR47J I would assume this is a 47ohm 5 watt resistor. the part is testing dead short. I wonder if this could have caused the melt down.

ntehicks · Joined: 25 Mar 2009 Posts: 162 Location: Herriman, Utah

I don't know if anyone has a service manual or schematic for this TV. I replaced the bad resistor and tested. the resistor smoked and got so hot. so I un pluged the set. there is something shorted on this resistor.

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JTS1957 · Joined: 21 Jan 2009 Posts: 2395 Location: Far, Far Away

Sounds like you may have two problems.
Board is Power Supply / Inverter. Resistor appears to be in power supply; Burnt connector is in the inverter section.

ntehicks · Joined: 25 Mar 2009 Posts: 162 Location: Herriman, Utah

do you have a schematic on the set. I am wondering if I have the right resistor for R501 5WR47J.

JTS1957 · Joined: 21 Jan 2009 Posts: 2395 Location: Far, Far Away

Sorry, no.

Jesse Mack · Joined: 22 May 2008 Posts: 600 Location: The Last Frontier

First, Resistors never short, they do the opposite. They go toward infinity when failure occurs.

I looked up this unit the the value of this resistor is .47, not 47.

If the backlights come on, even for a second, I would do as kuhurdler suggests first. These boards can detect resistive backlight connections and would shut down as a result. The original damage is usually caused by the connectors going bad. Not necessarily the backlight.

Next thing in a row.
I looked for a supplier and only found one that had it in stock. This supplier only supplies pulls. (from salvaged sets) and I have never heard anything bad. If you go this route you can simply put in the model number here: http://www.shopjimmy.com/ and it will pop up.

Jesse

ntehicks · Joined: 25 Mar 2009 Posts: 162 Location: Herriman, Utah

I put the old resistor back in. I then plug in the tv and it has a very high pitch sound. when I unplug the tv the sound is still there for about 6 seconds and then a woopt sound and then no high pitch sound. didn't know if this is normal operation. I will try to turn the set on tonight and see if it works..