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My Emerson lcd tv (Model Number: EWL20S5 B) will turn off after being for a few seconds. I believe it is my inverter board. But I'm not sure and would love to know.

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Posted on Jan 02, 2017


SOURCE: Emerson EWL20S5 20 in.

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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SOURCE: WHERE To BUY power boards for emerson 32" FS TV

I had the same problem. Mine gave out in 4 months. Those boards are hard to find right now. Google the the board# BA71FOFO1042 and someone like ( I think will sell TV parts. If not, you can fix the board itself like I did. Mine was a bad inverter transformer. If you need the parts# for anything let me know, I have the Service Manual for the TV. Good Luck

Posted on Jan 25, 2009

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SOURCE: emerson lc320em82s need help checking inverters

1. On the power inverter board unplug all 6 wires that go to the LCD screen.
2. Test each of those ports for resistance.( the one without the resistance is the bad one.)
3. Or, test each port for Voltage output ( this will happen very briefly since the TV will turn itself off automatically).( The one without voltage will be the bad one).

Posted on Mar 21, 2009

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SOURCE: I need a replacement stand (base) for an emerson

You will need part number 1EMN20039B just do a goolge search with that part number. Good Luck.

Posted on Nov 05, 2009

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SOURCE: looking for parts list and or service manual for

Tries websites like, buy a whole refurbish LCD inverter board.No,body will sell it to u in by componnents to componnents.

Posted on Apr 24, 2010

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It sounds like a power surge has damaged the color controller and scan line section of the circuit board. The cost to repair is more then the replacement cost. Next time use a UPS for protection (battery back up for computer and electronics). Regards

Dec 18, 2013 | Emerson EWL20S5 20 in. EDTV-Ready LCD...

1 Answer

My emerson tv keeps turning its self off after a few seconds

I do not have a model number to go with. But I would imagine this TV is still on the new side. If this is the case, the values on the starting resistors for the inverter board have changed values. You will need an inverter board replaced. Or if you know of an authorized Philips Center, they may replace the resistors with the same value or new values, depending on the model number of your TV. Thanks for asking and show a few hands of support!

Feb 28, 2011 | Emerson Televison & Video

1 Answer

My Tv turns off right after it has been on for five seconds.. I think it's the inveter.. What do you think? What should I do?

It's either the Power Supply or the Inverter. Without more info and voltage measurements, I cant be 100% sure.

Nov 24, 2010 | Emerson EWL20S5 20 in. EDTV-Ready LCD...

1 Answer

Tv automatically shuts off after being on for a few seconds EWL20S5

The most common problem for this set that will cause shutdown after a few seconds is the inverter board. Looking at the set from the back, it is the long slim board that is normally located on the far left side of most lcd tv's. There are 3 electrolytic capacitors located on this board, and changing them will fix a lot of these sets for this problem. The location numbers of the caps are c330, c350, and c370. If you have any experience working on electronics, I would start by changing these caps. They are very inexpensive. If you would rather just change the inverter board, try That is a good place to buy boards for flat screen tvs.

Jul 29, 2010 | Emerson EWL20S5 20 in. EDTV-Ready LCD...

1 Answer

My tv turns off after about ten seconds of being on

Check the power supply caps and the voltage on the inverter board. Your will more likely to have the 5vdc and 12vdc only.
Please see my basic troubleshooting guide here:

Jun 17, 2010 | Emerson EWL20S5 20 in. EDTV-Ready LCD...

1 Answer

TV will not stay powered up. The light comes on for a second, then powers off again.

you have a bad transfomer on your inverter board you need a tech to find which one or just replace the board

Sep 24, 2009 | Emerson EWL20S5 20 in. EDTV-Ready LCD...

1 Answer

Emerson tv goes off after a few seconds

The shutdown is probably caused by the power supply, although it may not be at fault, just trying to prevent a fire.

There may be other circuitry that is failing and drawing excessive current and most supplies are designed to turn off if the current drawn exceeds a certain maximum.

This is not a problem you can solve without technical skills.

Jul 06, 2008 | Emerson EWL20S5 20 in. EDTV-Ready LCD...

1 Answer

Ewl20s5 Will not power on

Google bad or blown capacitors image and you will see what you need to look for on the boards primary bad caps are on the power board where the power comes into the computer. inverter board can also be issue but rare.

May 15, 2008 | Emerson EWL20S5 20 in. EDTV-Ready LCD...

4 Answers

Emerson EWL20S5C Shuts off after 10 secs

Jan 12, 2008 | Emerson EWL20S5 20 in. EDTV-Ready LCD...

5 Answers

Emerson EWL20S5 20 in.

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.

Oct 24, 2007 | Emerson EWL20S5 20 in. EDTV-Ready LCD...

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