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

**tomstr** · 11-29-2012, 01:20 PM

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

Post 37 METER IN DIOD TEST RESULTS ON CIRCUIT-D240B- AND D-240A 217. IS THIS OK? THEN I PUT BLACK TEST LEAD ON LARGE SOLDER JOINT,AND RED ON LEFT SOLDER JOINT,AND THEN ON RIGHT SMALL SOLDER JOINT SAME READINGS ON BOTH CIRCUITS, 217 READINGS,WILL SENT PICS OF FLIP SIDE OF BOARD TO SHOW WHAT IM TESTING.

**tomstr** · 11-29-2012, 01:26 PM

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

HERE ARE THE CIRCUITS D240a D240b ARE WE WORKING ON THE RIGHT CIRCUITS?

Attached Files

**tomstr** · 11-29-2012, 01:28 PM

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

Originally posted by johnboy1313

my readings are listed in the link i provided. The tv is back together and hanging on the wall. I'm probably not going to take it down and open it back up until there is a fault of somekind. I don't know though, crazier things have happened.

i can't find your link on the readings?

**budm** · 11-29-2012, 01:36 PM

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

"Ok again tested circuit t.1 set meter at 200 ohms NOT 200k ohms is 00.9 on 12-13 and 00.9 on 12-14 IS THAT WHAT YOU NEED?" OK, that is more like I expect from the transformer widings resistance, I do not know how you get 7.75 Ohms in the first place.

**budm** · 11-29-2012, 01:36 PM

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

Post 62, yes, they are the two diode for the 24v POWER SUPPLY.

Do you mean .217V as readout shown on the meter?

**tomstr** · 11-29-2012, 01:40 PM

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

Originally posted by budm

is the meter set to 2k ohms as shown in the picture, if it is that means it is showing 7.75k ohms (7750 ohms!).set it to '200' ohms range and take the reading again. I expect it to be less than one ohm. What resistance do you get when you short the meter leads together?
Your meter does have diode mode.
I also drew up simplified diagram, as you can see, there is not much for the 24vdc section at all.

circuit-d210 meter in diod test- meter reading-181

**tomstr** · 11-29-2012, 01:42 PM

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

[QUOTE=budm;287348]Post 62, yes, they are the two diode for the 24v POWER SUPPLY.

Do you mean .217V as readout shown on the meter? NO METER IN DIOD TEST IS 217. NOT VOLTS

**budm** · 11-29-2012, 01:51 PM

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

Well your meter must not be the same as most other meter, my FLUKE show 0.290V which represents the Forward voltage drop of 0.290V, but any way, that seems OK if I can believe your meter reading, the Forward voltage of your Diode is .217V.
Well I cannot see why you are not getting any 24v since the transformer is OK, the Didoe are OK, the 12v section is working.

**tomstr** · 11-29-2012, 01:53 PM

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

Well anything else you need ?are the diodes ok?

**tomstr** · 11-29-2012, 01:57 PM

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

Originally posted by budm

Well your meter must not be the same as most other meter, my FLUKE show 0.290V which represents the Forward voltage drop of 0.290V, but any way, that seems OK if I can believe your meter reading, the Forward voltage of your Diode is .217V.
Well I cannot see why you are not getting any 24v since the transformer is OK, the Didoe are OK, the 12v section is working.

REMEMBER CIRCUIT-d210 is meter in diode test 181 is that ok?

**tomstr** · 11-29-2012, 02:05 PM

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

Originally posted by budm

Well your meter must not be the same as most other meter, my FLUKE show 0.290V which represents the Forward voltage drop of 0.290V, but any way, that seems OK if I can believe your meter reading, the Forward voltage of your Diode is .217V.
Well I cannot see why you are not getting any 24v since the transformer is OK, the Didoe are OK, the 12v section is working.

OK ALSO CIRCUIT-q602-diode in meter-494 1420. Q-601 diode in meter reading-494-899 DOES THIS HELP?

**tomstr** · 11-29-2012, 02:15 PM

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

Originally posted by budm

well your meter must not be the same as most other meter, my fluke show 0.290v which represents the forward voltage drop of 0.290v, but any way, that seems ok if i can believe your meter reading, the forward voltage of your diode is .217v.
Well i cannot see why you are not getting any 24v since the transformer is ok, the didoe are ok, the 12v section is working.

i don't think i tested the tranformer?

**tomstr** · 11-29-2012, 02:49 PM

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

Budm if your still there?i have a question..

**budm** · 11-29-2012, 02:53 PM

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

"Ok again tested circuit t.1 set meter at 200 ohms NOT 200k ohms is 00.9 on 12-13 and 00.9 on 12-14 IS THAT WHAT YOU NEED?" You already tested the transformer resistance, it is OK per your post 59

**tomstr** · 11-29-2012, 03:06 PM

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

OH YES I TESTED THE CIRCUITS D240a and D240b D-120 METER AND 200 k ohms..HERE IS MY QUESTION IM GOING TO SEND YOU A PIC OF THE PINS I WAS TESTING WITH BOARD INSTALLED AND EVERYTHING PLUGGED IN,THIS WILL HELP YOU UNDERSTAND STEP BY STEP OF WHAT IM DOING OR DID. THIS IS WE'RE WE SHOULD START SO NO I MEAN NO MORE QUESTIONS AS TO WHAT I DID.SO I WILL SEND A PIC AND OTHERS TO GET UP TO DATE..

**tomstr** · 11-29-2012, 03:12 PM

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

IF YOU LOOK AT THIS PLUG YOU CAN SEE WERE IT SAYS 24v THE BOTTEM SAYS PSON STARTED AT THE TOP WAS NO RECIVING 24 volts WITH CONNECTOR PLUGGED IN I BACK PROBED WITH A SEWING NEEDLE?

Attached Files

**tomstr** · 11-29-2012, 03:18 PM

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

STEP 2 ON THE LEFT SIDE YOU CAN SEE TWO PLUGS,UPPER LEFT I STARTED AT THE TOP PLUG NO 24V TO THIS PLUG ALSO,ONCE AGAIN WIRES PLUGGED IN AND NEEDLE TO BACK PROBE..SAME AT THE BOTTOM PLUG NO VOLTS. Here is a picture

**tom66** · 11-29-2012, 03:19 PM

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

Please don't type in all caps -- it's quite hard to read.

Anyway, I know some Delta power supplies of this generation used fuses on the output. I have seen a few of them. Both in Philips LCD TVs.

It would be very rare for a power supply to fail to produce 24V, but still be able to produce the 12V, etc.

Fuses will be marked like "F8A/32V" near them; can you see any?

**tomstr** · 11-29-2012, 03:21 PM

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

Here

Attached Files

**tomstr** · 11-29-2012, 03:23 PM

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

Originally posted by tom66

Please don't type in all caps -- it's quite hard to read.

Anyway, I know some Delta power supplies of this generation used fuses on the output. I have seen a few of them. Both in Philips LCD TVs.

It would be very rare for a power supply to fail to produce 24V, but still be able to produce the 12V, etc.

Fuses will be marked like "F8A/32V" near them; can you see any?

Sorry about caps old habbet!will check for fuse give me a few

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

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