Funai lc320em1f

[Shane711]

Re: Funai lc320em1f

Well I was looking at the one you provided in post #4 on page 38 (10-3) I think is. Not sure if the board is the same but I can't find anything closer. It is in the bottom left corner of the schematic.

[Shane711]

Re: Funai lc320em1f

If I look through my scraps and find another glass diode with nothing printed on it, do you think that will work?

[dick_barton]

Re: Funai lc320em1f

Hello Shane711
Can't you add say a 10K resistor in series with it and apply a voltage from a power supply. Measure the volts drop across the diode and this should tell you if it is a schottky diode, standard diode, zenner diode.

I bought a version of this component tester which works reasonably well.
http://www.ebay.co.uk/itm/Component-...-/361094470192

[Shane711]

Re: Funai lc320em1f

OOh, that is beyond my current knowledge. I would have to study this because I am not sure what you are saying. Is there a video I can watch?

[dick_barton]

Re: Funai lc320em1f

Hopefully this may help.

If D1 is a silicon diode, then 1 way round the voltage read by the meter as you increase the power supply from 0 to eg 20V will be 0.4V – 0.7V

Reverse the diode and the diode will block the voltage so the meter will read approximately what the power supply is set to.

A schottky diode will be identical to the above except the voltage drop is lower at approximately 0.2 – 0.4 volts

A zenner diode, the voltage across the diode will increase until it reaches it's zenner voltage as you increase the power supply voltage and then remain at this value while you continue to increase the power supply.

If you reverse the zenner diode then you will have standard diode voltage drop across it.

[budm]

Re: Funai lc320em1f

The diagram shown as OPEN = Not installed.
The blank PCB BA94F0F0102 6 can be stuffed to created many PCBA (PCB aseembly) for many models of TVs.
Does it look like the pads had been touch?

[Shane711]

Re: Funai lc320em1f

Yes, there was a diode there that someone removed. The solder is melted away with 2 remaining holes. Definitely tampered with. I guess I will have to find the correct schematic for this board in order to figure out what diode is missing. I did not know that saying "OPEN" meant nothing was installed there. You just taught me something new.

Looks like testing that diode to see what kind it is will not make any difference because I see now the boards must be for 2 different TVs and I can't use the one as a reference for the other. I will just have to put this on the back burner until I find a perfect match.

[CapLeaker]

Re: Funai lc320em1f

are you sure your TV ends in em1f, not em2f? The em2f had a D609 installed. Was it a glass diode? I think it is a 1ss133. Probably the same on the em1f.

[budm]

Re: Funai lc320em1f

We need to see the stickers on the power supply board to get the PCBA number.

[CapLeaker]

Re: Funai lc320em1f

In this schematic D609 in in there and in the parts list it is a 1SS133. Try a 1n4148... that is a very common diode.

[Shane711]

Re: Funai lc320em1f

To tell you the truth I am not sure what TV it came out of. It was a broken board I had in my pile to be fixed. I usually tag the boards but no tag on it. Since it was closest to a good LC320EM1F board I had, I assumed that's what it was. I took some pictures of the stickers.

[budm]

Re: Funai lc320em1f

To tell you the truth I am not sure what TV it came out of. It was a broken board I had in my pile to be fixed. I usually tag the boards but no tag on it. Since it was closest to a good LC320EM1F board I had, I assumed that's what it was. I took some pictures of the stickers.

So the board you are trying to use is not the original one that is installed into the TV. They have so many versions and most of the time goes by the serial number or the series.
Can we see the the model number tag on the back of the TV? There may be chassis number on it.

[Shane711]

Re: Funai lc320em1f

If I find out what TV it was intended for I will tag it and use it in the correct TV. But I have all these parts so I just decided to fix it. I have a whole assortment of the common parts that go bad in these Emerson TVs. I keep them in a container separate from all my other components. Getting better and better at it everyday.