Sanyo DP42545 no video, has sound . Ready to try some tests.

[Jimmy Nolins]

Hello , On my Sanyo DP42545, I have sound but no picture and was hoping someone could walk me thru checking some things .
I have checked 2 fuses on board 1 , 1 on board #2 , 1 on board #9 .A green led lights up on the front of the tv and board #1 and remain that way till i turn the tv off. Caps all appear flat and not leaking.
On board #4 ,Logic Main Board has 4 leds -- the second one ( from left to right ) marked led2002 on power up blinks a couple times then goes and stays out ... the last one ( from left to right ) marked led2000 is the one that blinks all the time . I have found some info and says if no video on any input check :

line: ic2001 - ic301 - ic7001 - pdp Panel
Parts: Around IC2001 ( DIGITAL DECODER), IC301 (SCAN CONVERTER),IC7001 (LVDS Interface),PDP Panel

How and what do i do to check them ? Any other thoughts you may have to check also ? I thought i seen a post on here saying to remove the YB UP board from the y main and yb low but can't seem to find it now .

I will be working on this after work in a few more hours




Numbered in photo

1: TV POWER SUPPLY # LJ44-00092F
2: x MAIN Sustain # LJ41-02246A
3: -----
4: Logic Main ( BEHIND BOARD 6) # LJ41-03075A
5: TCP F-BUFFER # LJ41-02244A
6: J3TR Main Board # B10N11600
7: TCP E-BUFFER # LJ41-02243A
8: Digital Tuner (SANYO) # B10N11600
9: Y MAIN Sustain #LJ41-02247A
10: YB UP #LJ41-02248A
11: YB LOW #LJ41-02249A

[tom66]

Re: Sanyo DP42545 no video, has sound . Ready to try some tests.

It looks like a Hitachi panel... but it could be a Samsung, that panel sticker looks familiar.

First check would be PSU output voltages, including plasma panel voltages (Vs and Va, or whatever they are called on this set.) If those are present, check fuses. Post a closer picture of the PSU if you're unsure where to probe.

[Jimmy Nolins]

Re: Sanyo DP42545 no video, has sound . Ready to try some tests.

Yes its a Samsung mostly parts it seems :PDP says model s42sd - yb05 and also says sdi :s42sd-yb07

Yes , i don't know where to test , which board # do you need a closer pic of ? I have a yellow fluke meter if i can fiqure it out .

Jimmy

[retiredcaps]

Re: Sanyo DP42545 no video, has sound . Ready to try some tests.

I have a yellow fluke meter if i can fiqure it out .

Post a picture of it.

[tom66]

Re: Sanyo DP42545 no video, has sound . Ready to try some tests.

Yes its a Samsung mostly parts it seems :PDP says model s42sd - yb05 and also says sdi :s42sd-yb07

Yes , i don't know where to test , which board # do you need a closer pic of ? I have a yellow fluke meter if i can fiqure it out .

Jimmy

I would like a closer pic of the power supply

[cmj21973]

Re: Sanyo DP42545 no video, has sound . Ready to try some tests.

Here's the SM for your set:

[Jimmy Nolins]

Re: Sanyo DP42545 no video, has sound . Ready to try some tests.

ok its a 87 III True rms multimeter

Not sure if you mean board # 1 or # 3 in my picture , here is both .

Cmj21973 , thank you . That must of been where i see to check lines:
ic2001 - ic301 - ic7001 - pdp Panel
Parts: Around IC2001 ( DIGITAL DECODER), IC301 (SCAN CONVERTER),IC7001 (LVDS Interface),PDP Panel

Also readded the picture from first post = bigger with the numbers i put on the board , might be more clear now

[retiredcaps]

Re: Sanyo DP42545 no video, has sound . Ready to try some tests.

ok its a 87 III True rms multimeter

That is one high end multimeter. I sure hope you know how to use it.

I don't have any hands on with plasma so I'm not the best person to be directing you, but do keep in mind that you will be dealing with voltages close to 200V DC or more.

The Fluke 87 is forgiving of mistakes, but try not to let the probes slip or touch anything including the heatsinks which may be/are live.

[Jimmy Nolins]

Re: Sanyo DP42545 no video, has sound . Ready to try some tests.

My grandpa gave me it about a year ago . I have never used it , iam lost with it

[retiredcaps]

Re: Sanyo DP42545 no video, has sound . Ready to try some tests.

My grandpa gave me it about a year ago . I have never used it , iam lost with it

You are one lucky guy. You should thank him for it.

It is one of Fluke's highest end multimeters. A replacement will cost you close to $350 new. Treat it with respect.

I suggest you set DC volts (that is the DC with the flat dotted and solid line) and start measuring AA, 9V, etc batteries to get used to it.

An excellent and quick tutorial is at (less than 5 minutes)

http://www.youtube.com/watch?v=bF3OyQ3HwfU

[retiredcaps]

Re: Sanyo DP42545 no video, has sound . Ready to try some tests.

I should explain that 200V DC or more may be enough to get your family calling 911. If you are going to measure these voltages, I suggest having someone close by monitoring your work in case something goes badly wrong.

Regulars here write clear easy to understand instructions with the target audience in mind, but obviously, we can't be held responsible for your lack of comprehension, attentiveness, or carelessness.

If you are unsure, ask for clarification.

[cmj21973]

Re: Sanyo DP42545 no video, has sound . Ready to try some tests.

Fluke 80 series III manual.

[Jimmy Nolins]

Re: Sanyo DP42545 no video, has sound . Ready to try some tests.

So i read some other posts again and thought at least let me check the y upper and y lower buffer boards . I recalled reading here about coppell blog and a write up they did. So i found it , but my buffer board connectors are different then the black ones shown . How do i test the style i have ?

[Jimmy Nolins]

Re: Sanyo DP42545 no video, has sound . Ready to try some tests.

Looks like iam gonna strip the tv and take what i can to the scrap yard .

[tom66]

Re: Sanyo DP42545 no video, has sound . Ready to try some tests.

So i read some other posts again and thought at least let me check the y upper and y lower buffer boards . I recalled reading here about coppell blog and a write up they did. So i found it , but my buffer board connectors are different then the black ones shown . How do i test the style i have ?

Can you show a picture of your buffer boards, and around the power supply near where the wires go out to the sustain boards?

[Jimmy Nolins]

Re: Sanyo DP42545 no video, has sound . Ready to try some tests.

I can see the spots for Vs and Va . I can grab more focused shots if these aren't good enough when i get back . I also located a board replacement if i decide this one is bad.

The TV is sitting a garage , and thou its older and likely not worth alot . I am thankfull for the help i am getting as this is a learning experience .

[Jimmy Nolins]

Re: Sanyo DP42545 no video, has sound . Ready to try some tests.

Alright, got me a magnify glass to assure i was doing what needed to be done ... I checked the VA and VS = VA is 70.3 , VS is 207.3 , VE shows 109.8 .
pdp say should be VA=70/VS=207/VE=109 ... So far this appears within specs.. What would be the next step

[tom66]

Re: Sanyo DP42545 no video, has sound . Ready to try some tests.

Those seem in spec. How do the fuses check out?

[Jimmy Nolins]

Re: Sanyo DP42545 no video, has sound . Ready to try some tests.

Those seem in spec. How do the fuses check out?

i removed the 4 i could find ( seperately tested each ) , 2 on main board and 1 on z main and 1 on y main . I did a continuity with the dmm and it showed zeros , i didn't check them on the board .

[rpgruss]

Re: Sanyo DP42545 no video, has sound . Ready to try some tests.

If you have a non-contact infrared thermometer, turn the TV on with everything connected. Give it a few minutes, check the temperatures on the Y and Z sustain board heatsinks. They should be warmer than room temperature. If one of them is room temperature then that is likely your defective board.