inverter schemes


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inverter schemes

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skyjak
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Nov 17, 2012, 4:45 PM

Post #1 of 9 (1629 views)
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inverter schemes	Can't Post

Hi,
Does anyone know where I can find a schematic for an LG inverter board, part # 6632-0207B. YPNK-T009A. TV model is 32LC2D. I need the data sheet for transistor Q1.

Thx.

(This post was edited by skyjak on Nov 17, 2012, 4:47 PM)

Repair man
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Nov 17, 2012, 5:06 PM

Post #2 of 9 (1626 views)
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Re: [skyjak] inverter schemes [In reply to]	Can't Post

Can you read the part number on Q1 or is it too burnt?

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skyjak
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Nov 17, 2012, 6:27 PM

Post #3 of 9 (1621 views)
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Re: [Repair man] inverter schemes [In reply to]	Can't Post

The marking on the part is NC. That's it.

thx

Repair man
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Nov 18, 2012, 5:45 AM

Post #4 of 9 (1610 views)
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Re: [skyjak] inverter schemes [In reply to]	Can't Post

I don't have the Schematic but I did see a picture of the inverter board online & to me looking at how that transistor is connected in the circuit it appears to be an N-Channel FET transistor.

There are only 2 voltages present on the primary side of the inverter (24volts & 5 volts) so if you use any N-Channel FET rated at 24volts or higher you should be safe.

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skyjak
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Nov 18, 2012, 5:03 PM

Post #5 of 9 (1601 views)
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Re: [Repair man] inverter schemes [In reply to]	Can't Post

Thx. I checked out an equivalent transistor and it refers to a marking code with NC on it. I think this is the sub.
Check this pdf..
http://www.nxp.com/documents/data_sheet/BF840.pdf

Repair man
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Nov 19, 2012, 4:34 AM

Post #6 of 9 (1591 views)
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Re: [skyjak] inverter schemes [In reply to]	Can't Post

You may be right, good work! I thought it was an FET transistor (Field Effect Transistor) but I was only guessing by the way it was wired so maybe it is just a regular transistor, so the one you found info on may work. If it's wrong it will likely only damage the new transistor & not the rest of the inverter.

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skyjak
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Nov 19, 2012, 8:56 PM

Post #7 of 9 (1578 views)
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Re: [Repair man] inverter schemes [In reply to]	Can't Post

Hi,
I couldn't find the BF840 so I replaced it with a 2N3904. The C-E and C-B voltages are rated a little higher but it's still working so far!!

Thx for your time with this, Repair Man.

SJ

Repair man
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Nov 20, 2012, 2:37 AM

Post #8 of 9 (1573 views)
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Re: [skyjak] inverter schemes [In reply to]	Can't Post

That's great news! ... So how did you narrow down that was the problem with the inverter? That's some good diagnostic skills you obviously have experience with electronics.

.

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skyjak
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Nov 21, 2012, 3:06 PM

Post #9 of 9 (1560 views)
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Re: [Repair man] inverter schemes [In reply to]	Can't Post

I do have a bit of electronics experience. I used to have my own computer and TV\Stereo repair shop for 10 years. Closed up about 6 years ago. I worked mostly with CRT tv's. I just started to get into LCD. Tv's have changed quite a bit.

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