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

[tomstr]

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

Pson pin back probing wire volts is-4.88 wire above that 0 volts-abobe that-4.96-next-4.96 next-4.96-next-0 next-0 next12.04 volts Let me know were else to check? You guys get back FAST. THANK YOU

[selldoor]

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

Its easier of us to read if you post them as
1 Ps-on 4.88
2 sgnd 0.0
3 sgnd 0.0
4 5v 4.96 and so on

Did you still get nothing on 24v.

Another check on the PSON -can you switch the tv off and test the pson and hold the
probes in place as you turn the tv on - (you may need help with that)

Please can you update your profile with at least country and mains voltage.

[tomstr]

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

Will get back this afternoon i will double check that 24 v pin but its zero but will check, i live in houston texas.

[tomstr]

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

What time zone is the fourm in?im in houston and will be posting at 8 pm central?

[tom66]

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

The timezone is the same one you set at registration, but you can alter it under "User CP" -> "Settings & Options" -> "Date & Time Options".

Many users here are in the USA. I am in the UK. Several are from Romania and other parts of Europe. Several Ozzies, too. I know there is also at least one member from Japan here.

[selldoor]

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

On the bottom of my screen it says GMT-6. It is one reason I ask you to update your profile 2 or three posts down I will not remember you are Houston so tomorrow morning I could be wondering why you are not
responding
Similarly when you post at 8pm Hopefully I will be asleep.

[tomstr]

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

Changed profile,i will double check the board this evening. Post results,and wait for response!CAN I ADD 24volts to the inverter to test the back lights?

[tom66]

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

If you have a 24V, 10A power supply, sure, you can supply it separately.

[tomstr]

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

Ok here are the readings. P/S CH-2 circuit top to bottom sgnd-0 sgnd-0 sgnd-0 sgnd-0 sgnd-12.05 sgnd-12.05 sgnd-0 sgnd-0 sgnd-4.96 sgnd-4.96 sgnd -0 sgnd-0 sgnd-4.89. The tv is powered on all circuits plugged in, don't know what else to check on the power board?seems to be a fuse or no high voltage at all ...

[budm]

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

Can I get good clear pictures of both sides of the power supply board, I need to see how this 24v section is controlled.

[tomstr]

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

Hope this helps

[tomstr]

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

Ft of board

[budm]

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

It is not in focus, I think I can see the problem but it is out off focus.

[tomstr]

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

Is this the side you want to see?

[budm]

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

OK, the 12vdc and the 24vdc are generated by the same transformer and circuits, since you are getting the 12VDC OK, then you have problem in the 24vdc rectifying circuits. I can see bad solder joints. Also take the resistance reading on those two points.

[tomstr]

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

Ok in the pic I used my red lead on one terminal and the black on the other and it's 000 and the solder joint with the hole in it,there is nothing there it's a empty port

[budm]

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

OK, take the reading between pin 12 and 13, and 12 and 14 of that transformer T1.
RECTIFIERS check, see picture.
By the way, just to be sure, you do have 12vdc reading when you hit the TV power switch and the 12v is there but no 24v, is that correct?

[tomstr]

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

As stated earlier i have no 24 volts at all on the power supply pins.and some 12 volts on the pins but not sure which one?

[budm]

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

SO it has to be in the 24v output section, please read updated post 37.

[tomstr]

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

Test buy using voltage or what?