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Emerson Model LC320EM81 Won't stay on REPAIRED !!!!   Goto page 1, 2  Next  
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ntehicks



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

PostPosted: Fri Oct 23, 2009 11:34 pm    Post subject: Emerson Model LC320EM81 Won't stay on REPAIRED !!!! Reply with quote

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.

Last edited by ntehicks on Thu Oct 29, 2009 10:06 pm; edited 1 time in total
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ntehicks



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

PostPosted: Fri Oct 23, 2009 11:48 pm    Post subject: pictures of problem Reply with quote


kuhurdler



Joined: 28 Dec 2006
Posts: 2855
Location: Overland Park, KS

PostPosted: Sat Oct 24, 2009 8:00 am    Post subject: Reply with quote

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

PostPosted: Sat Oct 24, 2009 2:12 pm    Post subject: Reply with quote

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

PostPosted: Sat Oct 24, 2009 11:01 pm    Post subject: Reply with quote

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: 2323
Location: Far, Far Away

PostPosted: Sun Oct 25, 2009 12:15 pm    Post subject: Reply with quote

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

PostPosted: Wed Oct 28, 2009 7:47 am    Post subject: Reply with quote

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: 2323
Location: Far, Far Away

PostPosted: Thu Oct 29, 2009 12:25 am    Post subject: Reply with quote

Sorry, no.
Jesse Mack



Joined: 22 May 2008
Posts: 600
Location: The Last Frontier

PostPosted: Thu Oct 29, 2009 11:43 am    Post subject: Reply with quote

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

PostPosted: Thu Oct 29, 2009 4:12 pm    Post subject: Reply with quote

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..
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