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Mark
71
Asked
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
Any input would be appreciated!
P.S. I know this article was posted on iFixIt, but there really wasn't much there:
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oldturkey0
87.9k
Answered
Accepted Answer
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.....CAPACIT
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.
Mark,
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.
Mark,
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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Answered
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.c
Jeff
@ 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...
Mark,
Check on Ebay, I found the board that I needed there. http://www.ebay.com/sch/i.html?_from=R40...
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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KEith
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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
KEith, your question, which you had posted as an answer, has been moved to its own question. Check here http://www.ifixit.com/Answers/View/11060...
Mark, motherboard, logic board and main board all mean the same thing.
ABCellars,
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?
Mark,
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: http://www.ifixit.com/Guide/Repair/Repai.... 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.
Mark,
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?
oldturkey03,
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/ma
Mark,
Ok, and I want to confirm that the problem right now as it stands is that when plugged into the wall and the power button is pressed, nothing happens. Page 41 of the manual addresses this I think, though I can't exactly understand what should be done. It first says to check if fuse F601 is open (what does OPEN mean?). If it is, I'm supposed to check the Varistor (VA601), Sub Power & Filter unit. What do I check? Then, if the fuse isn't problem, it says it could be the PDP Module Power unit, which I believe is the same thing as what I've been calling the Power board. On page 10 it says when disconnecting the PDP Module Power unit, you have to disconnect CN8004, CN8003, and CN8001. Those numbers are present on the unit I purchased, but not on the unit inside the TV. However, what has me confused is that the unit inside the TV I believe has 6 cables connected to it, not 3. Thank-you so much chaps for sticking around and helping - I REALLY appreciate it!
Mark,
I wonder if that unit got previously repaired and exchanged for the model that you have in the TV. Any physicla numbers on the board on the inside of the TV that we could cross reference. Power unit is the power board. Fuse open means circuit not closed. Kind of like a blown fuse or a breaker that needs to be reset....:-) PDP module part number 1AV4T44B02101
oldturkey03,
AAX30284301 cross reference to your TV http://www.tvpartsnow.com/product.php?id... and amazingly enough so does LJ44-00132A http://www.shopjimmy.com/samsung-lj44-00... So I guess you have to excahnge your board for the other model....Sorry wish I could have a different answer
oldturkey03,
Hmmmm... so you are saying that even tho' both power boards correspond to the same TV, I'll have to buy another one of the type that currently is in the TV? Are you sure there isn't a way to replace with the one I bought? If not, is it because there are different versions of TVs within a model #? (Like revision A, B, etc.)?
Mark,
Yep, sure looks like it. Both links that I previously sent had pictures on them and there are definitely visible difference between the one you have and the one that it calls for....sorry.
oldturkey03,
It's weird because on the back of the TV it says DP50747, but almost all the boards inside the TV are slightly different than what is shown in the article on iFixit here: (http://www.ifixit.com/Guide/Repair/Repai...) My unit's powerboard is indeed: aax30284301 AND the logic/main/moth
Mark,
Hey Mark, First let me thank you for accepting my answer. Second, I think that you are doing the right thing, you may just have one of those models with many suppliers and therefore slightly different hardware. During my research of your parts, I was surprised how many of the TV's actually share the same part, like you power supply.Don't give up and proceed the way you started. Does the manual help at all? As in help I mean the steps for repair. Start with the power and work your way around that. On here we will of course continue to assist you.
oldturkey03,
Hey again oldturkey, thanks for your help. As I mentioned previously, the manual has some P/Ns that are different in my actual TV, but it still helped a little bit. I updated my current predicament and questions with a separate question on iFixit which is a little more concise. The thread is located here: http://www.ifixit.com/Answers/View/50257... Thanks again!
Mark,
did u find out what as wrong with tv
patrick,
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