Sanyo dp42848. No picture no sound?has anyone found the problem

[tomstr]

I have a Sanyo dp42848 no picture no sound,reading over all threads related model tvs,seems to be a pattern with this tv?my tv has no backlight on at all,has sound,flashlight shows image in background,HAS ANYONE FOUND FIX?i know that someone should have found something?thank you ....please let me know

[drpj23]

Re: Sanyo dp42848. No picture no sound?has anyone found the problem

Well you could be the one to resolve it. Do you have a meter to test with?

If so, go through the post you replied on as a guide and verify voltages to the inverter including BL_ON (or BL_SW) and then (if voltages are good) check resistances on the inverter transformers.

[tomstr]

Re: Sanyo dp42848. No picture no sound?has anyone found the problem

Will do i have a volt tester FROM WHAT. A REPAIR SHOP SAID ITS A BOARD PROBLEM OR WIRES INVERTOR?

[budm]

Re: Sanyo dp42848. No picture no sound?has anyone found the problem

So you do not have any meter to at least check the voltages?

[drpj23]

Re: Sanyo dp42848. No picture no sound?has anyone found the problem

Well if you don't, you can probably find a cheap one at a local hardware store.

And it could be inverter wires, CCFL, inverter board, power supply, or the main. The previous post will eliminate at least 2 of those choices. But since we don't have the TV physically on us, you are going to have to work with us if you want to fix it yourself.

[johnboy1313]

Re: Sanyo dp42848. No picture no sound?has anyone found the problem

https://www.badcaps.net/forum/showthread.php?t=24040

Here's one I fixed. Same model, I don't know if its the exact same problem but similar symptoms. Mine turned out to be burned out bulbs.

[tomstr]

Re: Sanyo dp42848. No picture no sound?has anyone found the problem

Yes i do have a digital meter

[tomstr]

Re: Sanyo dp42848. No picture no sound?has anyone found the problem

https://www.badcaps.net/forum/showthread.php?t=24040

Here's one I fixed. Same model, I don't know if its the exact same problem but similar symptoms. Mine turned out to be burned out bulbs.

Well my tv has no picture at all its just black and with a flashlight i see a picture !seems to me if it lights for a few seconds then its a diffrent problem

[tomstr]

Re: Sanyo dp42848. No picture no sound?has anyone found the problem

Well I don't think I'm getting 24 volts from my power supply to my invertors.if I'm testing the right wires.

[drpj23]

Re: Sanyo dp42848. No picture no sound?has anyone found the problem

Red probe on 24v rail (wire) and black probe on chassis or screw? Make sure the meter is set to DC volts (line with dotted lines) and battery ok?

The bulbs can still light if one is bad. The other working bulbs will light for a second or two then circuitry will detect the broken bulb and shut the inverter off. You will sometimes hear a buzz by the inverter board before it shuts off.

[tomstr]

Re: Sanyo dp42848. No picture no sound?has anyone found the problem

What is the rail wire?i unplugged the wire on the power supply upper left at top of power supply,the power supply Board read 24v so I probed that pin. No volts the wire that goes to that pin is white and goes to the invertor, tried on the slave invertor same thing,the other wires show lower voltage like 4.75. But no 24 volts with the tv on plugged in?so if I'm doing it right IS THE POWER SUPPLY TO BLAME?ok will wait up tonight for your reply, thanks

[budm]

Re: Sanyo dp42848. No picture no sound?has anyone found the problem

You can also check the 24vdc right at the white fuse on the inverter board.

[tomstr]

Re: Sanyo dp42848. No picture no sound?has anyone found the problem

[QUOTE=johnboy1313;286810]https://www.badcaps.net/forum/showthread.php?t=24040

Here's one I fixed. Same model, I don't know if its the exact same problem but similar symptoms. Mine turned out to be burned out bulbs.[/QUOT NO VOLTS AT THS FUSE

[tomstr]

Re: Sanyo dp42848. No picture no sound?has anyone found the problem

[QUOTE=tomstr;286921][QUOTE=johnboy1313;286810]https://www.badcaps.net/forum/showthread.php?t=24040

Here's one I fixed. Same model, I don't know if its the exact same problem but similar symptoms. Mine turned out to be burned out bulb. I HAVE NO VOLTS AT THE WHITE FUSE

[budm]

Re: Sanyo dp42848. No picture no sound?has anyone found the problem

OK, the 24v power supply is not working.
johnboy1313 posted the picture of the power supply board but did not show the closed up pictures of the 3 white connectors, we need to verify if the power supply is getting the PS_ON signal from the main board to turn on the 12v/24v power supply.
Can you post the pictures of the connectors?

[tomstr]

Re: Sanyo dp42848. No picture no sound?has anyone found the problem

Hope the pics help

[tomstr]

Re: Sanyo dp42848. No picture no sound?has anyone found the problem

Hope the pics help

[drpj23]

Re: Sanyo dp42848. No picture no sound?has anyone found the problem

What is the voltage on the first pin (PSON) of that connector (CN2) when turned on?

Actually, listing the voltages at each pin when the TV is on might be helpful.

[tomstr]

Re: Sanyo dp42848. No picture no sound?has anyone found the problem

I will reinstall the board in the morning in a couple hrs.i think the voltage is low what should it be?

[drpj23]

Re: Sanyo dp42848. No picture no sound?has anyone found the problem

It should be >3v for PSON.