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Andrew Johannis
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Sanyo dp42849 black screen

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I have a sanyo dp42849 and the picture stopped working. The power light is on but the screen is completely black. Not sure if the audio works or not but I think that it doesn't work too but like I said im not sure. I did some research and I found that it may be the power supply board and to check the capacitors. I looked and they seem fine. So I am not sure what else I should check for or if it is just the whole power supply that is fried and Mabie I just need to replace the whole thing.

Edited by: Andrew Johannis ( )

When you say you looked at the caps, what did you find? Did you check the Power supply with a meter to see what you voltage is?

oldturkey03,

Ya I looked at the capacitors to see if they were bulged, leaking, etc. but they all look fine, as far as testing it I'm not 100 percent sure how to do that. I know how to use a voltmeter just not sure how to use it on a board like this.

Andrew Johannis,

contact me by email, it si in my profile, I might have the service manual for your TV. First TV repair?

oldturkey03,

yup my first. i am pretty much a self taught DIY-er but this is my first tv repair.

Andrew Johannis,

Just like anything else, take your time, make sure you are organized and have the right tools. Once I get home, I will post a link to the service manual and the trouble shooting manual for your TV. It will not fix your TV for you, but will most certainly help :-)

oldturkey03,

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oldturkey03
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Andrew Johannis, besides the most common error being on the power board, also check the caps and fuses marked F1 and F2 on the inverter board.

UPDATE

I added the flowchart from the service manual. you did not tell us if you have anything on your TV in respect to blinking LED or anything. So start with this flowchart, it is hard to see as an image on here but works if you print it out. ...Hope this helps, good luck.

Block Image

Edited by: oldturkey03 ( )

Ok I'll print this off and look it over and comment back.

Andrew Johannis,

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Jason King
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Coppell TV Repair seems to be fixing the main boards on those TVs:

http://blog.coppelltvrepair.com/2012/07/...

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Power supply is rarely bad in Sanyo DP series and that sure includes DP42849.

They have two popular problems: the main board and the inverter boards.

The main board can fail in different ways and result in different failure symptoms.

I'd say wait a little longer to see if the TV remains on (front LED lit) or does it cycle every 30-40 seconds.

If it stays on and doesn't cycle then most likely the main board is OK and you're looking for new inverters.

If it shuts off (front LED off or red) or if it cycles every so often then it's probably the main board.

Note the DP42849 comes in several different releases, all different enough to each other to actually NOT be appropriate to refer them to as "DP42849".

You need to know the exact chassis model of your TV (e.g. P42849-00) and look for that to be certain you'll find the part your actually need.

Better yet, open the TV and look inside for actual part numbers...do NOT rely on what Internet is throwing at you because more often than not it will NOT be what you will need.

For more see here:

http://blog.coppelltvrepair.com/2012/07/...

and

http://www.coppelltvrepair.com/search?Q=...

Hope this helps!

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