Sanyo DP58D33 sound but no picture

[ace88bull]

Sound, no picture, back-light is working, no picture with a flashlight, and I've replaced the T-Con board with no change. Any suggestions of what to test or check?

I can add pictures if needed.

Voltage on the power board with TV on:
PS-ON 3.19
GND -0.08
5VSTB 5.04
5VSTB 5.04
GND -0.10
12VA 12.33
12VA 12.33
GND -0.06
Audio Power 12.33
GND -0.08
Line Off 3.25
BL-ADJ 1.12
BL-SW 3.15
Audio Power 12.33

LED5- 27.2
LED4- 27.4
LED3- 28.7
LED2- 29.1
LED1- 27.6
NC Erratic
NC Erratic
LED+ 141.1
LED+ 141.1
LED+ 141
LED+ 141
LED+ 141

[budm]

Re: Sanyo DP58D33 sound but no picture

1) We need pictures of the whole back side of the TV showing all the boards.
2) Did you verify that you do have 12VDC feeding the T-CON board by checking the DC Voltage at both ends of the fuse against the chassis GND?

[Andrew F. Ali]

Re: Sanyo DP58D33 sound but no picture

You could also try disconnecting one side at a time the FFCs to the Panel from the T-CON Bd to see if half a picture appears.

[ace88bull]

Re: Sanyo DP58D33 sound but no picture

Picture 1: Overall
Picture 2: Powerboard
Picture 3: Mainboard
Picture 4: Subdigital board
Picture 5: T-Con board

I'll need help finding the fuse you're talking about. This is my first time troubleshooting something like this. Same with the second suggestion. Thanks in advance for your time and effort

[budm]

Re: Sanyo DP58D33 sound but no picture

https://www.badcaps.net/forum/attach...8&d=1536713331
Fuse = FP1 (white body witj 'K' printed on top). You can also see Voltage test pad 'VIN12'
BTW, what is the history of the TV, someone work on it before?

[ace88bull]

Re: Sanyo DP58D33 sound but no picture

Getting 12.23V on both sides of the fuse and the bottom solder point on the VIN12.

I bought the TV new. Worked fine for about 5 years until this issue. I swapped the T Con board but that’s the only work that’s been done on it.

[ace88bull]

Re: Sanyo DP58D33 sound but no picture

Anything else I can check out? LED's? Or is there a way to check the panel?

[budwich]

Re: Sanyo DP58D33 sound but no picture

see post 3 :-)

[ace88bull]

Re: Sanyo DP58D33 sound but no picture

Those the ribbon connectors from the T Con board going down to the panel?

[crt man]

Re: Sanyo DP58D33 sound but no picture

Yes.

[ace88bull]

Re: Sanyo DP58D33 sound but no picture

Looks like you were on to something, I'm not sure what it means though. Second picture shows which one was disconnected when I got the half screen.

[budm]

Re: Sanyo DP58D33 sound but no picture

I would start looking for bad (shorted) caps on the tab bonding board where the Cable from the T-CON to the panel goes to.

[ace88bull]

Re: Sanyo DP58D33 sound but no picture

Would swapping to the original T Con board and checking for the split screen be beneficial?

[budm]

Re: Sanyo DP58D33 sound but no picture

The old T-CON board may be OK since the fault is in the panel.

[budwich]

Re: Sanyo DP58D33 sound but no picture

what happens when you do the other side as suggested? It more than likely a panel problem but wait til you see the result... more suggestions there after.

[ace88bull]

Re: Sanyo DP58D33 sound but no picture

what happens when you do the other side as suggested? It more than likely a panel problem but wait til you see the result... more suggestions there after.

I attempted the left ribbon connector first, the screen stayed black. When I removed the right one, that's when I got the split screen.

[ace88bull]

Re: Sanyo DP58D33 sound but no picture

I would start looking for bad (shorted) caps on the tab bonding board where the Cable from the T-CON to the panel goes to.

Being a noob, I'm not sure about some of the things you mentioned here. Somewhere I can look to see where on the board you mean and how to test?

[budwich]

Re: Sanyo DP58D33 sound but no picture

ok... soooo... with that new information, it would appear that the problem is on the side that was disconnected and you got a picture on the other side.

you need to provide pictures of the bottom area showing the edge boards along the bottom all the way to the side corner. Then you need to look at long the side to see what tabs (like the ones on the bottom) that connected to the side of the panel... note you have to see these by removing the front bezel IF they, the tabs, exist.

[ace88bull]

Re: Sanyo DP58D33 sound but no picture

Alrighty, I'll look into that tonight or Sunday night. Thanks!

[budwich]

Re: Sanyo DP58D33 sound but no picture

I probably should add... do some reading of tab failures as there are lots of posts and do also as was suggested and look for failed components on the bottom edge boards associated with the side that doesn't work.