Sanyo dp46848!!

[aaronpass]

Hello everyone!! I came across this tv on the side of the road and thought i would take a shot with it. Figuring the worst, a shattered screen i brought it home and plugged it in. I have a similar problem as others have, only mine is on the right side instead to the left. When i first turn the tv on with no cable signal coming in, i get snow on the left side and it gets darker toward the center and all the way to the right the screen starts out with a 6" wide from top to bottom white bar that fades to the right off the screen. But the screen doesn't have much movement the whole right 1/3 of the screen. The sound starts out with static then starts to fade off and crackle. Does anyone have an idea to push my way???It would be much appreciated, Thank You!

[cashkennedy]

Re: Sanyo dp46848!!

If the sound and video have issues:

Then i would consider issues with the power supply (test all the voltages leaving the power supply (except for any thick white/pink wires and verify they are close to what they are marked as being on the board.

And second it could be an issue with the mainboard. If you search for a manual for your model it might have some simple troubleshooting steps on which parts to test. (DC-DC regulator tests)

[aaronpass]

Re: Sanyo dp46848!!

If the sound and video have issues:

Then i would consider issues with the power supply (test all the voltages leaving the power supply (except for any thick white/pink wires and verify they are close to what they are marked as being on the board.

And second it could be an issue with the mainboard. If you search for a manual for your model it might have some simple troubleshooting steps on which parts to test.(DC-DC regulator tests)

I unplugged the connection from the power suppy board to the main board and tested the pins on the power supply. The 5v pin only had 1.7 and the 3 that were marked 12v were only 2v am i testing this correctly?

[tom66]

Re: Sanyo dp46848!!

Where are you putting the black probe of your meter?

This does sound like bad caps on the PSU.

[aaronpass]

Re: Sanyo dp46848!!

Where are you putting the black probe of your meter?

This does sound like bad caps on the PSU.

Im putting the black probe on the terminal marked gnd for ground im assuming!

[aaronpass]

Re: Sanyo dp46848!!

If this is bad caps, is it hard to pinpoint which ones are bad? or would the power supply board need to be changed out?

[vinceroger69]

Re: Sanyo dp46848!!

is this the board you have got?
http://www.ebay.co.uk/itm/SANYO-DP46...item2ebcfd19f1
see if you can post some good close up pictures of your board.

[cashkennedy]

Re: Sanyo dp46848!!

I prefer to take the voltage measurements while the boards are connected and the TV is on. Uusually you can sneak a probe into the connector from the top.

Make sure your multimeter is set to DC voltage and not AC voltage, then test with 1 probe on the voltage wire you want to test, and the other probe on the ground pin / or a peice of metal on the frame / case of tv. You can take readings with either ground, usually they are the same , if they are different then you can post that that here.

If your voltages are still significantly off like you posted above, then you obviosuly have some bad power supply issues (caps are a good starting place to check), if you post pics people might see some bad ones.

[aaronpass]

Re: Sanyo dp46848!!

is this the board you have got?
http://www.ebay.co.uk/itm/SANYO-DP46...item2ebcfd19f1
see if you can post some good close up pictures of your board.

Yes that looks like my board..

[aaronpass]

Re: Sanyo dp46848!!

[aaronpass]

Re: Sanyo dp46848!!

sorry they aren't the greatest pics

[aaronpass]

Re: Sanyo dp46848!!

I prefer to take the voltage measurements while the boards are connected and the TV is on. Uusually you can sneak a probe into the connector from the top.

Make sure your multimeter is set to DC voltage and not AC voltage, then test with 1 probe on the voltage wire you want to test, and the other probe on the ground pin / or a peice of metal on the frame / case of tv. You can take readings with either ground, usually they are the same , if they are different then you can post that that here.

If your voltages are still significantly off like you posted above, then you obviosuly have some bad power supply issues (caps are a good starting place to check), if you post pics people might see some bad ones.

I did take these readings with the tv plugged in and on i just unpluged the connection going to the cpu board and those were the reading i got

[aaronpass]

Re: Sanyo dp46848!!

Here are two pics of the main board and there are three caps that look like they have a stain on top but there isn't any bulging of the tops of them.

[cashkennedy]

Re: Sanyo dp46848!!

Its common to put red marker on the top of caps to indicate they have been tested.

If there is any texture / 3d shape to taht red stuff on the top, then those caps have leaked and are bad most likely. On 2 of them it looks like a blob in the pics (and so would be bad), but in 1 it just looks like a marker / or paint coating that is very flat.

[aaronpass]

Re: Sanyo dp46848!!

http://youtu.be/dF881_xL0Qw



<iframe width="560" height="315" src="http://www.youtube.com/embed/dF881_xL0Qw" frameborder="0" allowfullscreen></iframe>

This is a video of my tv turned on and this is what its doing! Watch the whole video toward the end the static (sound) will start to disappear then turns to a crackle sound. Hope this will help point me in the better direction meing power supply board, main board, or something with the back lighting..

[tom66]

Re: Sanyo dp46848!!

Did you check the caps as cashkennedy suggested?

[aaronpass]

Re: Sanyo dp46848!!

Did you check the caps as cashkennedy suggested?

I did see any caps swollen on either the power supply board or the main board. I did post pictures. Of three caps on the main board that are either marked as tested or they are leakers. They are 48uf 35v caps i was just gonna change out to be sure, but the only caps i can find available are 47uf 35v will these work??

[tom66]

Re: Sanyo dp46848!!

I did see any caps swollen on either the power supply board or the main board. I did post pictures. Of three caps on the main board that are either marked as tested or they are leakers. They are 48uf 35v caps i was just gonna change out to be sure, but the only caps i can find available are 47uf 35v will these work??

I've never heard of 48uF caps. Maybe 68uF?

[aaronpass]

Re: Sanyo dp46848!!

I've never heard of 48uF caps. Maybe 68uF?

There is definately a 4 and an 8 looks like 48uf i guess maybe 4.8 but i dont see it looks like 48. Will a 47uf work in its place or am i looking at a sure melt down????

[aaronpass]

Re: Sanyo dp46848!!

I've never heard of 48uF caps. Maybe 68uF?

I must have cooked a few capacitors in my head lol, I misread them you are 100% right they are 47uf 35v caps! im gonna try to change out the caps that have the marks on top of them that look like leaks and see if that changes anything!!