Question about Emerson EWL20S5 20 in. EDTV-Ready LCD Television

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Emerson EWL20S5 20 in.

My Emerson EWL20S5, 20 inch LCD TV shuts off after a few seconds of turning it on.
I found this solution..
"If this happens right away or after only a few seconds, there is a 3 terminal voltage regulator with 7805 in its part number that may have a low output voltage rather than 5 volts."
Is there an online schematic, or how to pictures, for someone who likes to see what they are about to get into?

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  • Rocky1789 Dec 18, 2007

    comes on for a few seconds then shuts off, while on everything works

  • Kerfir Mar 20, 2008

    Problema que presenta: enciende pero se apaga a los 10 segundos.





    Posible solución: Se le hizo una inspección a todos los circuitos y al board y todo luce correcto. Luego procedimos a verificar el IC606/UTC 7805, y los transistores Q401/C8481, Q601/ K3869, Q603/C2120, D647/, KIA431625.

    También los capacitares C610/100:F/200V, C611/150:F/200V, C632/22:F/100V, C631/2200:F/25V, C633/2200:F/16V, C636/220:F/50V, C637/470:F/16V, C634/1000:F/10V, C650/330:F/25V, se reemplazo C649/470:F/16V.

  • Anonymous Oct 07, 2008

    shuts off after a few seconds.

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El TV no enciende y desconecte la señal Protect 1, enciende pero la parte inferior de la pantalla no presenta información nitido o es muy poca la información. La power supply esta bien, solo el voltaje panel -6 esta bajo, alrededor de 3,5 v. el audio esta bien¿que puede ser?.

Posted on Aug 28, 2009

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Ok, my tv was doing the exact same thing. What turned out to be wrong was one of the florescent backlight bulbs was broken. The tv was given to me, so I'm not sure how it got broken, but replacing the bulb repaired the tv.
This is not an extremely hard repair, but you have to be careful.Doing this repair entails disassembling the entire screen assembly. If you have any doubt at all about doing it, get a pro (like me). Getting a new bulb was not hard for me because I have several of these units in my shop with bad LCD screens; it may be a little harder for the general public.
I hope this helps.

Steve Wright.

Posted on Dec 19, 2007

  • spearslynn Sep 21, 2010

    dude where can i get a florescent backlight bulb for my unit ?????

  • Steve Wright
    Steve Wright Sep 21, 2010

    These sets are made by Funai. You can try reaching them by email at: parts@funaiservice.com

    Good luck,

    Steve.

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I had the same problem got the tv for free so i just opened the back mine was the top inverter i clipped the "protect 1" wire with clippers and bam good as new a little dim but i havent figured that part out yet how to brighten it

Posted on May 31, 2010

This TV has a network of diodes connected to a PROTECT-1 line monitored by the control IC. If any circuit pulls this line low, the control IC turns the system OFF. The diodes act to isolate all the circuits from each other, its called a diode-OR circuit.
You can troubleshoot by opening a diode which disconnects a circuit from pulling the line low. I had a hunch the EL backlight board was bad, so after opening that protect line the power stayed ON.

I found a bad .068uF 250V cap on the transformer primary, it measured .002uF. I've replaced the cap and the other two on the other transformers just for good measure.

It probably took more time than the TV is worth, but my friend's Mom will be happy, and thats worth it.
I hope this helps, look around for the service manual, it can be found online.

Posted on Jan 15, 2008

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Hey sewright34, i know someone who is having the same problem, is there anyway to get parts from you?

Posted on Jan 03, 2008

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http://www.partstore.com/Part/Funai%20Corporation%20Inc/Funai/LTZ2PC0MS008.aspx

http://www.encompassparts.com/products/?LTZ2PC0MS008

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