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Replacing Sanyo DP50747 Powerboard - Help Appreciated!

Hello everyone!

I recently bought a used Sanyo DP50747 TV which the owners had for a year and then the picture stopped working for them. They took it to a electronics repair store which said that the "motherboard" would have to be replaced, to quote the previous owners. They were were quoted at $300-800 or so for labour and parts.

So I cam along and picked it up for $15 from them and found a used powerboard for under $100 (no such thing as a motherboard), and now need to know if there is anything I should know before opening up the TV and replacing the powerboard.

Is it pretty straightforward? Is there a manual I should refer to? Should I do any tests on the parts? Is there anything I should be careful about doing? Anything specific to repairing plasmas, as I've never done this before...

Any input would be appreciated!

P.S. I know this article was posted on iFixIt, but there really wasn't much there:

How do I replace the powerboard on dp50747 plasma tv

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Mark, motherboard, logic board and main board all mean the same thing.

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Hey ABCellars, thanks for the info. So just wondering if nothing shows up on the display would you think it would be the Logic board or the Power board?

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Oh brother. I took apart the casing and found that the power board that I bought to replace the other one (though that may not be the issue), is different.

I don't understand. The one in the TV is the aax30284301, but the one I bought was for the same TV and is identical to the one in this iFixit article: Sanyo dp50747 Plasma TV fuse replacement and power board check. It's model # is: LJ44-00132A. So they are for the same TV but different. I don't know what to do.

I guess I'll wait until I get the motherboard (or main board as it's referenced in the service manual) before I try anything else.

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Mark I would proceed the same way as you have planned. Start with the power board that way you have a starting point. You will know that it is a good one. Going by second and third hand info is what makes repairs expensive since you go by what somebody else was told....I'd go power board than logic board. Did you check the flowchart for the fault finding in the manual?

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Hi again oldturkey03, as mentioned I would have replaced the power supply "just in case", except that the one I got and the one I got to replace it have a different P/N. I purchased a LJ44-00132A which I researched was supposed to fit this TV, but the one inside it is a aax30284301. I also checked the flow chart and it says if there is no video whatsoever that the logic board should be checked. One thing that had me confused was that in this picture on iFixit (http://guide-images.ifixit.net/igi/wf3Gj...), it says the logic board is what is outlined, but I believe the logic board is UNDERNEATH it. It has the big black square which is the CPU(?), like on computers. This is what the logic/mother/main? board looks like I believe. (Please correct me if I'm wrong): http://www.discounttvparts.com/PhotoDeta...

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Mark, here is the Service Manual and it should give you a better idea of what is involved. As in what to watch out for.....CAPACITORS Good Luck

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Hi oldturkey03, thank-you for the service manual. I couldn't find any instructions in there about replacing the power board. In fact, it wasn't even mentioned in there.

I'm hoping I wasn't supposed to replace what they call the "main board" or the "logic board" as I've seen it called. If so, I don't know where to find it.

As I mentioned above, the person who sold me the TV said it was called the "motherboard" which doesn't fit either description.

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+ oldturkey very nice service manual, more detailed than most. Great job supplying it for Mark.

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Mark page 49 gives more of the power board as well as the pwr control assembly.

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I checked pg 49, but I all it has is it shows 3 connections going into it, with CN8004, CN8003, and CN8001, but those don't even match up with the ones currently going into the powerboard, and the the powerboard replacement I got doesn't have any of those numbers at all.

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That is weird since it is definetly the right manual for the model. I triple checked on that. Wonder if Sanyo got some other supplier for this model. So physically the connections are different? Any chance that the board is different but the connections the same?

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Mark & Old Turkey,

Apparently there is more than one Sanyo DP50747 version because when I contacted Sanyo to see if I could get the power Board LJ44-00132A they asked me for the chasis #. Mark if you still have the board LJ44-00132A & can't use it I need one for a set I am repairing & no one seems to have one. contact me at jseeaz1@yahoo.com

Jeff

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@ Jeffrey Citron

Hey Jeff, unfortunately, I don't have the board anymore as I sent it back, since the one I need it AAX30284301, which I also can't find anywhere...

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Check on Ebay, I found the board that I needed there. http://www.ebay.com/sch/i.html?_from=R40...

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Still got that manual, I sure could use a copy.

Thanks.

OF newbie

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from an oldturkey to an Old Fart....here it is good Luck to you.

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I can't access oldturkey's guide. I have the same problem with my Samsung 50" TV. It has been aggravating thus far.

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Its not the fuse I tested it i was told to check the compastitors for leaking, i foun one that had a waxy substance comiing out of one

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KEith, your question, which you had posted as an answer, has been moved to its own question. Check here looking for the power fuse

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OK I have been here before lol. I have replaced all three YSUS and buffers. Plugged in the power and There was a click. LED lights came on but D2. Then they all went off. power supply clicked again then power light went off after 20 sec. What now???????? I unplugged the Ysus board to see if it was the problem. When I do that none of the led's come on??? I'm so lost!!

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hey oldturky do you still have that manual for the dp50747. Mine is a 50747-04 and it is different than may 50747. Thanks jdo

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