Emerson LED TV - Solid Red Light

I'm trying to fix my Emerson LF391EM4F LED TV. I'm pretty good overall at fixing things, but TVs are new to me. I'm a computer tech and have mechanical engineer and programming background and play around in the hobbyist world. Thanks in advance for any assistance. -Mark

I believe I've diagnosed it to the IR sensor board (aka Function CBA Unit). But still it could be other things. I did read through My10Cents articles which gave some solid info and then lots and lots of stuff on this and other sites.

Emerson LF391EM4F (also released as Magnavox 39ME313V/F7)
S/N ME1** (A3ATKUT) (label placed over the original 2EMH00264)
Manufacturer: Funai
Warranty: It's out of warranty (by many months)

Two Types: A or B (but none of the listed models in the service manual match A3ATKUT, so perhaps another although very similar)
A: S/N DS2
B: S/N DS1, DS3

Function CBA Unit: P/N: Type A: A3ATCMSW-001 | B: A3AT0MSW-001 | ME1: A3ATHMSW-001

Symptomatic Description:
Throughout, the unit powers on with a steady red light on the front panel. However, I could not turn the unit on using either the remote or mechanical buttons. The red standby light never flashes and remains steady.

This was after a power outage (or two). It's plugged into a surge protector. For a couple of days, if I unplugged the unit for a minute or so and then plug it back in, then both the remote and the mechanical buttons would turn the TV on and off - until the next day. This worked for 2 or 3 days, but then stopped working. I left it unplugged overnight, tried the 60sec mechanical on button hold (while plugging in and after). No changes in symptoms. Most everything I read seems to suggest this is the Function CBA Unit, but I've also seen the main board as a suggestion. I still get a solid red light with the LED power and T-Con disconnected (nothing with the IR/mech buttons board disconnected, but that makes sense). I don't hear whines.

Diagnosis:
Readings on the web suggest this means it's the IR/Function CBA Unit. A visual inspection of the power board shows no capacitor bloating problems and everything else looks clean and solid everywhere.

I finally found a service manual and it lists the unit as made by Funai as both Emerson LF391EM4 and Magnavox 39ME313V/F7.

When I search on the 2 (types) part numbers (listed below), ShopJimmy site returns results only for the Type B part number, and it's no-where close (apparently split into two parts, -key and -ir for the 50" version). The best I could find was the one above, but unknown if compatible.

I believe I'm trying to find the correct replacement IR sensor board (aka Function CBA Unit). The number on the board: BA31M0G0203 1 achieves no results on the ShopJimmy site. Nor could I find the part by using TV Parts -> Brand -> Parts.

I found a similar board from Funai on the shop jimmy site: A3AFCMSW-001
Differences upon visual inspection:
- Board number: BA31M0G0203 1 (mine) vs BA31T0G0203 1 (shopjim)
- button side: "NO. 8" (mine) vs "NO. 9" (shopjim)
These are essentially identical visually except for that and the line manufacturer stamp. Should I suppose they are compatible?
Other similar models I found: A4AT0MSW-001
Differences upon visual inspection (besides white color):
- Board number: BA31M0G0203 1 (mine) vs BA4AT0G0203 1 (shopjim)
- button side: "NO. 8" (mine) vs "NO. 3" (shopjim)
This one says it's for Magnavox models with S/N starting with ME1 which is what my Emerson model has, suggesting it could easily be a compatible replacement. However this 2nd one is out of stock which is why I'm hoping the first one would work as well since they have them in stock.

Answer
my10cents avatar
1 year ago #2
my10cents
Guru
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Let it be known that these TV's can have several failed parts at 1 time-
I just want to give you a little bit of information on a IR Sensor shorting out and stopping your TV from turning on.
Your led light would have to be flashing red, continuously. Yours is not-So here's where I think your TV is--
-TV stuck in standby mode, will not initiate start up-
Repair-- Replace Main Board
Now if you TV was stuck on (Blue, Green)
I would go with the Main Board, I don't think at this time it's your IR Sensor--
I would presume that the Power Board is sending the voltage to your Main Board, but not returning it to power board to start up--

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inforiculturist avatar
1 year ago #3
inforiculturist
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Thanks. I'll order the main board then and let you know how it goes. -Mark

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inforiculturist avatar
1 year ago #4
inforiculturist
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Success! It was indeed the Main Board CBA.

ShopJimmy didn't have the board. I searched for a couple of days before I found a posting for an (even more) affordable price on eBay from ElectroPartsOnline (also available at their website with discounts posted on their home page). It arrived 5 days later, and I installed it today. I'm back up and running. Thanks my10cents!

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 avatar
6 months ago #5
pt
Guest

this was the main board or the power board? did the me1 serial numbers make a difference on which board to buy?

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my10cents avatar
6 months ago #6
my10cents
Guru
Blogs: 60
Forum: 14,542
Votes: 111

Are you stuck in red standby?
Give me your Model Number, and first 3 digits of serial number-
Let me know-

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 avatar
6 months ago #7
Pt
Guest

Me1 and there is no power at all.

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my10cents avatar
6 months ago #8
my10cents
Guru
Blogs: 60
Forum: 14,542
Votes: 111

So is your TV a Emerson LF391EM4F LED TV
No power at all or dead, is Power Board.

Emerson A3ATHMPW-001 (BA3ATHF0102 2) Power Supply LF391EM4 LF391EM4F ME1
Go here- http://www.ebay.ca/itm/Emerson-39-LF391EM4-ME1-A3ATK022-Power-Supply-Board-Unit-/171635692422?hash=item27f648d386
Scroll down to bottom for more info-
Let me know-

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 avatar
6 months ago #9
pt
Guest

it is a magnavox, just under 3 years old

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