Question about Sanyo DP50747 50 in. Plasma TV

4 Answers

No Pic No Sound

This seems to be a common problem on this model. My set started acting up a few months back and has gotten progressively worse. When I attempt to power up the TV the green light comes on, the screen starts to come on, then poof the screen goes dark. Several seconds later the green light goes off. After numerous attempts I'm able to get the set to work. This morning it took me about 15 attempts to get the TV to come on. Once the set is up and running it works normally for the most part but it occasionally shuts off by itself. As long as the set's still warm, it will turn back on normally, but when it's been off and is cold it takes repeated tries to get it back on. I use to be a TV tech years ago and my first suspicion was a power supply issue but I'm not so sure after reading some of the posts out there. Whatever the cause, this set is obviously defective. My set is under 2 years old and judging from what I see online Sanyo should recall this model or offer free repairs. If anyone knows what board or component is causing the problem I'd sure love to know.

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  • dmarr109 Oct 01, 2009

    I've already looked at the manual and gone to the Sanyo website. The 1st so-called expert is stating the obvious. Judging from all the people having the same problem as myself, someone should know the exact component or board that's causing this problem. I need troubleshooting assistance. I can replace the board or component once I know what it is.

  • dmarr109 Oct 01, 2009

    It seems you have a lot more on the ball than the first guy that responded. I was a tech for about 15 years back in the 70's and 80's. Today's technology is far beyond what I use to work with, The TV's I worked on were tubes and early solid state. I was thinking along the same lines as your are, power supply. There was a guy here on your site with the same problem that replaced the power supply but still had the same problem. That makes me a bit doubtful that replacing the power supply will resolve the problem. I've got a site that carries virtually every board on this model. None of them are over $160.00. I was hoping one of the techs on your site would have encountered the very same problem and could point me to the exact solution. Unfortunately I don't have any test equipment anymore aside from a DMM. I'm a disabled Vet and I really don't have the cash to just replace the set right now. Do you think any of the other techs on your site might know exactly what's wrong? It seems to be a very common problem with this set. Back in the day, Sams Photofax use to put out tech alerts on models with similar problems. Is there anything like that today? Thank's for all your help.

  • dmarr109 Oct 01, 2009

    I'm looking for a tech with experience on the Sanyo DP50747....anyone who has experience with this model please respond

  • dmarr109 Oct 01, 2009

    This not a CRT set, it's plasma.

  • dmarr109 Oct 01, 2009

    Anyone have direct experience with the Sanyo DP50747????

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4 Answers

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  • Master
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Hi,

You will need to remove the back cover to troubleshoot the plasma you will also need a digital multimeter. With out doing an troubleshooting it is hard to say so i would recommend following a troubleshooting guide, in my experience no video is ussually a failed Z sustain.

First look for missing voltages at power on each connector should be labled with the proper voltage. If you have one start with the missing voltage and troubleshoot back, it is hard to say what the ultimate failed components would be but you should be able to track it to one board.

Rule 1 is troubleshooting is "start with your sense"

1. Look
2. Smell
3 Listen
4. Touch (not recommend)
these are the best giveway, if it looks damaged it is if it smells burn it is, if it sounds wrong it is
1. Look - examine each component on the board look for something burnt, swollen or distorted, and look at the fuses.
2. Smell - Smell around the set see if you can smell a burning smell on any of the boards .
3. Listen- Listen for a buzz or an arc out of one of the board, it may be normal but unlikely if you have a defect.
4. Touch- Important because if the parts are getting hot then they are running, but if they stay cold they are not.

As for touch not the best idea on a power supply there is a high risk of shock, as some of the heat sink may not share ground and possible have a potential to earth ground between 5-500 volts.

You will need a DMM to check the diodes and the transistor non should read a short, if any do you will need to remove it and check it out of circuit if the component is not shorted but the short is still in circuit use the schematic to follow the leads to where else the short could be coming from and repeat.

I would have to say unless you are fimilar with repairing with a schematic it can be complex. Your best bet is to do what best buy techs do.... Replace The Board. It is the fastest sure fire way to fix it.

Next remove the connector connecting to Y sustain and the Z sustain to the power supply and attempt to power the set on if the set powers with the connectors disconnected you have more than likely identified the issue as a failed sustain board now to go further.

ww2.justanswer.com/uploads/PlasmaLCDPro/2009-05-17_045257_Plasma_explain.JPG

THIS IS NOT YOUR SET BUT A GOOD EXAMPLE.

Now reconnect the power connect to the y sustain and see if the set powers remember you will not get a picture but the lights on the front should stay light.

If the y main connected causes the set to act up remove the buffer boards and attempt again, if the y still causes the issue you have a failed y board. If disconnecting the buffer resolved the issue you have failed buffers and possible a failed panel, try replacing the buffers.

If the Y board connected the set still light normal disconnect the board and connect the z sustain and test the same as the y, if that causes the issue replace the z.


If you want to contact Sanyo :-

SANYO North America CorporationHeadquarters
2055 Sanyo Avenue
San Diego, CA 92154 U.S.A.
Tel: 619-661-1134
Fax: 619-661-6795

Customer Support:
E-mail: support@sanyotv.com
Phone: (800) 877-5032

If you want to purchase the Board yourself, below is the List of Manufacturers :-

http://www.mediafire.com/?sharekey=1f3a842ba5cb56835bf1f12f1ff3f30a1d0943a1b244ddfece018c8114394287

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!


Posted on Oct 01, 2009

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  • Sanyo Master
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If this model has a switching power supply then it could be a short anywhere overloading the supply. The H out transistor is easy to check for a shorted condition (unplugged, ohmmeter across C-E pins should NOT read 0 or low ohms), also the secondary rectifiers (I've seen them short on occasion).

Otherwise, in my experience I more often see shorted yokes than FBT's in Sanyos. Try unplugging the yoke plug and powering it up just briefly. If the noise is gone, then it's your yoke. (Some yokes are bonded to the tube and are impossible to remove. CRT replacement is not practical)

Posted on Oct 01, 2009

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  • Master
  • 555 Answers

Personally, I don't have an experience with the model number that you indicated but I have already seen this issue before on others TVs.

What happen with your TV is; when the TV is turned on, the power supply detects there is a short circuit or something that is using a lot of current. Therefore the circuit protection turns off the TV. Trying several times until bypassing the circuit protection will keep the TV on, but that doesn't fix the problem; the -suspected- short circuit still there.

So, I agree with you, this appears to be an power supply issue, BUT, it may not. I can't actually diagnose at the tv over the internet. (I guess nobody can) So, replacing the power supply is not guarantee that the problem is fixed. The source of the failure could be anywhere in any board in the TV.

If you feel confident with your experience fixing this TV, I recommend you to start looking on the power supply, the problem maybe a bad capacitor , transformer or power transistor on the power supply board. You can find and purchase a Service Manual over the internet; It will help you diagnose the source of the problem and fix it by soldering in the new part. The Service Manual will give you circuit diagrams, test points, and part# lists. Usually, cost under $20. And most cases the new part cost less than $15. In case a complete PCB needs to be replace, it will cost about $150.00 - $200.00

Before getting the TV fixed by a service company, I highly recommend you to request a quote first, the repair costs may be high and will be better to get a new one.

Hope this helps, good luck!

Posted on Oct 01, 2009

  • Jose Pino Oct 01, 2009

    Actually, a DMM is enough to find where is the failure, but it will not be an easy job. Here is how I fix this kind of issues:

    First, I set the DMM to DIODES and check each transistor looking for short circuits. If it shows about 700 or higher value; that means it may be good. If you find a transistor that shows a "0" value in the DMM; means there is a short circuit. If you find some part with a short circuit; is a good idea to determine if other transistors have the same problem. Somehow, today fuses have good quality; too good that doesn't blow when it should. So, A broken part may lead to several other parts (for that reason today technicians just replace the complete board and not take the time to repair at component level).

    Also, look for capacitors: Is any capacitor bulgy? Perhaps oily? Burning smell? If so, replace it. A capacitor like those means there is another part taking a lot of current from the power supply.

    I also remember the good old days when vacuum tubes ruled this world, unfortunately, these gold years are gone. Now, semiconductors are here to give us a headache.

    I will give you a tip as technician: Buy a canned air, the one used to clean computers (you can buy it at the computer store), As it blows cool air, it may help you to find what Integrated Circuit or semiconductor is broken. Silicon parts overheat when they fail, after certain temperature is reached, it gets into a short circuit condition. So, using the canned air, spray some to a part to cool it down to see if the tv works. You can use the canned air also to find overheating parts.

    I wish I can provide more help, but as I did mention before, I can't do a diagnosis over the internet. The only thing I can provide you is some tips and Ideas.

    Another tip, If you are to fix the TV (with the patience and determination), I highly recommend you to sell it and get a new one. Better to get a new one with warranty and not a repaired one that may break soon.

    Over here! this is the last paragraph ---> Regarding "Sams Photofax use to put out tech alerts on models with similar problems. Is there anything like that today?" - I'm not really sure, there is hundreds, perhaps thousands, of forums with people having issues with their TVs. Also, Models numbers are quite numerous. I guess it will take a while looking over the internet to find someone with the exact experience. Again, I can only recommend to choose the option to get assistance from another expert until someone with experience on this model number can assist you. Just post a comment indicating that you want an expert with knowledge about this model number.

    Good luck, I thank you for protecting America. God bless you.

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  • Master
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In the DP50747 Owners Manual, you can find this tips about your problem, review the page 17 for troubleshooting.

Also you can visit www.sanyoctv.com or call for free at 1-800-877-5032

I hope help you with this.

Posted on Oct 01, 2009

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