Emerson LC401EM3F No power - Please Help

[sawilson]

Hoping you can help me. I've got a Emerson LC401EM3F. Turned it off and went to work, came home turned it on and the red light came on then went off and now the TV does absolutely nothing. No red light or lights of any kind, nothing, not a thing. I unplugged and let sit, plugged it back in and still nothing. Had extended warranty but the warranty company says (without looking at it) it would cost more than its worth to fix so they're just sending me a gift card for Walmart for $216.00 for what we paid on black Friday 2012. Pulled the back off the TV and had no bulging caps. The power supply board for my Emerson LC401EM3F is Board number BA01P0F0103 5. Here's a link to a pic of it http://i488.photobucket.com/albums/r...pse39e5f18.jpg I have no experience in repairing Tv's but am very D.I.Y oriented. Just wondering what you think would be the main problem or if you think there's going to be multiple problems and I should just buy a new board and throw it in?

I have replaced:
IC1201
D1208, 1607, 1608, 1609, 1610,
D1201, 1202, 1203, 1204

When I plug it in, all I get is a click. I assume that is a relay which is normal from what I understand. But still have no lights of any kind.
Any help you could give would be appreciated. Thanks...

[Dgtech]

Re: Emerson LC401EM3F No power - Please Help

Are the output voltages of the power supply ok? Is the inverter integrated into the power supply?

[Caleb]

Re: Emerson LC401EM3F No power - Please Help

Will most likely have a shorted MOSFET, shorted zener shorted transistor and 3 open resistors on the power supply. Emerson has several of these models with similar crappy power supplies. If you give us clear pictures to mark up we can circle parts for you to test.
Check out this thread https://www.badcaps.net/forum/showthread.php?t=36180

[sawilson]

Re: Emerson LC401EM3F No power - Please Help

Thanks again for the help. All Mosfets have been replace but one. What I have replaced has been circled. The only Mosfet not replaced is the
one on the large heat sink in top left corner.

[Caleb]

Re: Emerson LC401EM3F No power - Please Help

Wow you have been busy, have you just been replacing parts without testing or were all those bad? Also that picture is still not clear enough to see all the board designations. Common failures on these are 1\4 watt zener diodes as well as the current limiting resistors for the MOSFETs, I see what appear to be three cement resistors what resistance do they test as?

[sawilson]

Re: Emerson LC401EM3F No power - Please Help

I ordered a repair kit from shopjimmy which stated what to replace for different symptoms. I don't have a meter so I simply replaced all that was sent. I know I should have tested but again, no meter. Hopefully this will be clear/large enough to see.

[sawilson]

Re: Emerson LC401EM3F No power - Please Help

Wondering if after all this I should just buy a board off ebay...

[Caleb]

Re: Emerson LC401EM3F No power - Please Help

You can get a decent enough meter for less than 25$, You can get a good one for about 50$ unfortunately without a meter you won't be able to tell what is good and what is bad.

[sawilson]

Re: Emerson LC401EM3F No power - Please Help

Are the output voltages of the power supply ok? Is the inverter integrated into the power supply?

Yes, I believe the inverter is built into the power board.

[sawilson]

Re: Emerson LC401EM3F No power - Please Help

You can get a decent enough meter for less than 25$, You can get a good one for about 50$ unfortunately without a meter you won't be able to tell what is good and what is bad.

I was thinking of getting one but I could get another board for about another $30 more on ebay and just save the hard work lol. Was just wondering (hoping) if anyone might have an easy out...

[Caleb]

Re: Emerson LC401EM3F No power - Please Help

You can go that route if you want, but when your TV dies again and with the build quality it has it will die again you will be out the money for another board. And a multimeter is an amazing tool, useful for many repairs.

[sawilson]

Re: Emerson LC401EM3F No power - Please Help

You can go that route if you want, but when your TV dies again and with the build quality it has it will die again you will be out the money for another board. And a multimeter is an amazing tool, useful for many repairs.

I've just never used one before. I feel comfortable doing all the soldering/desoldering but have never touched a meter before or actually know how to use one. If I knew how, I'd definitely go that route to fix it.

[Caleb]

Re: Emerson LC401EM3F No power - Please Help

A couple hours spent on youtube will give you all the basics on how to use your meter.

[sawilson]

Re: Emerson LC401EM3F No power - Please Help

Do you think it could be a bad cap even though they all look perfect? The caps are the main things I havent replaced and would take nothing to do. Could it be a bad relay?

[sawilson]

Re: Emerson LC401EM3F No power - Please Help

I also need to say that it's not blowing the fuse. Don't know if that matters but wanted to put that out there.

[Caleb]

Re: Emerson LC401EM3F No power - Please Help

I doubt its the caps, although I did have one with a shorted primary cap (hec) a few months ago. I would still bet on more bad diodes and possibly open resistors. Ive circled some likely suspects but you wont be able to tell if they are faulty simply by looking at them.
if one or more of the current limiting resistors is open it would not blow the fuse, same with a shorted small signal diode, cant source enough current to blow the fuse but isnt going to work either.

[Dgtech]

Re: Emerson LC401EM3F No power - Please Help

That's about the only thing that you can find out without a meter. Yes...the relay clicks therefore the voltage is getting past the fuse. Without a meter, you're just swapping parts. You might have a perfectly good power supply that you changed parts on. You really need to know what the output voltages are. Or just keep swapping parts and hope you don't put in a bad one. Borrow a meter from someone. Please.

[budm]

Re: Emerson LC401EM3F No power - Please Help

May be getting the new board or send it in for repair service since you do not have the tools to do the works
http://www.shopjimmy.com/magnavox-a1...supply-cba.htm
Once you get the power supply board to come on, next thing will need to check the main board and the inverter board.

[sawilson]

Re: Emerson LC401EM3F No power - Please Help

Thanks all for the help. Picked up a power board on ebay for $50 and threw it in, TV came right on with no problems . Works like new. Hard to believe this repair would of cost me about $250 through a shop... Thanks again.

[philfree]

Re: Emerson LC401EM3F No power - Please Help

Caleb i have the same issue on emerson power board no blown fuse but no power,i followed your instructions on what to check on the board,i uploaded my board with the same components you have marked on yours,readings are as followed,
R1604.........0 ohm (removed from board)
R659...........(.1 ohm)
R1720.........0 ohm
R1719.........0 ohm
R609...........(.2 ohm)
D1713.........(.685).....0L.....when leads are reversed
D1407..........(.691)....0L..... ----
D1710..........(.689).....0L.... -----

Is there anything else i should check for and how can i get the parts needed

Thanks for your help and expertise.