Panasonic Viera TC-L32U22 no picture

[Diah]

Re: Panasonic Viera TC-L32U22 no picture

I'm not sure at this point but the Tcon appears looking at the manual to be an integral part of IC8001 so perhaps this has suffered from poor solder connections and is one for the oven treatment.

yes its, but this not for oven treatment, as A Board double side. better with hot air gun

[pr0cess0r]

Re: Panasonic Viera TC-L32U22 no picture

i dont find at test point on the pcb...

[Diah]

Re: Panasonic Viera TC-L32U22 no picture

i dont find at test point on the pcb...

any way, its all give suspect of IC8001 go head to rebel it.

also check if the sound it had realy 15 Volts, as it share this with LVDS

[pr0cess0r]

Re: Panasonic Viera TC-L32U22 no picture

rebel?! reflow?

[Diah]

Re: Panasonic Viera TC-L32U22 no picture

yes lol...

[pr0cess0r]

Re: Panasonic Viera TC-L32U22 no picture

i will try it!

[pr0cess0r]

Re: Panasonic Viera TC-L32U22 no picture

afther more observation i think that the pcb got damaged by liqid. The black stamp whit the sufix code look whashed and some via have corosion ont theme.

[Redrum]

Re: Panasonic Viera TC-L32U22 no picture

sorry to bump this 2 1/2 year old post, but I have the exact same TV with the exact same problem - Power LED on solid, no blinking, no picture, but there is a backlight (you can see the backlight level change on input change), no picture, no sound**

** I have not tested sound on all inputs, just for the hiss on the RF input.

Was this issue ever resolved for the unit in this thread? I thought I would ask before I button it back up and take it to electronic recycle.

Jim

[nomoresonys]

Re: Panasonic Viera TC-L32U22 no picture

Check if you have 12 volts on each side of the tcon fuse, may have to look closely, the fuse should be labeled starting with Fxxx.

[Redrum]

Re: Panasonic Viera TC-L32U22 no picture

Hi,
thanks for the tip. But, I am not finding a tcon fuse. The only fuse I see is on the line. I have attached a snapshot of the block diagram for the service manual which show tcon12v being sourced by DTV12.

See attachment, am I looking in the right spot? P board or A Board?

Jim

[nomoresonys]

Re: Panasonic Viera TC-L32U22 no picture

Not exactly sure, I'm not too familiar with the integrated tcons.

[budm]

Re: Panasonic Viera TC-L32U22 no picture

You should show us the pictures of the T-CON board which means you have to remove the metal frames on the LCD panel to get to that integrated T-CON.

[Redrum]

Re: Panasonic Viera TC-L32U22 no picture

thank you, please see the pictures. Is this what I am looking for? The second picture just shows the portion of the board where the ribbon from the A board connects.

I'll look the board over next, but if you have any guidance, that would be great

Jim

[budm]

Re: Panasonic Viera TC-L32U22 no picture

Pictures are too blur to be able to identify anything on the board.
https://www.badcaps.net/forum/attach...5&d=1544124298
The fuse looks to be to the right of that LVDS connector.

[Redrum]

Re: Panasonic Viera TC-L32U22 no picture

ok, I originally took the pictures to say "is this where you mean?". I'll be happy to take all that are needed. Then, on trying to load them (as a jpeg) to the website it said invalid extention for png"????

Anyhow, here is another shot of the area. I see no fuses on the entire board, just smt components.

anyhow, as a reminder, solid LED on (not flashing), no picture, no sound, but I see backlight

Jim

[budm]

Re: Panasonic Viera TC-L32U22 no picture

Need to zoom in to the area as marked in the picture.

[Redrum]

Re: Panasonic Viera TC-L32U22 no picture

thanks, this is the best I can do. I don't have a macro lens. Took this full res, then cropped in photoshop.

what am I looking for?

In everything I have found, this TV has a P (ps) board, an A board, and two other little boards for the input/controls and the IR. The panel seems to be treated as an assembly. If you look at the manual in one of the first posts, the block diagram represents this. In searching for parts, only the A, P, and two little boards are represented.

So, I am thinking if the issue is indicative of the display control, and we can't find a smoking gun, perhaps it's time to recycle....

Jim

[budm]

Re: Panasonic Viera TC-L32U22 no picture

https://www.badcaps.net/forum/attach...3&d=1544132121
Check to see if you have 12V at pin 1, 2, or 5 of that LVDS connector with ref to chassis GND when TV is turned on.
BTW, what is the LCD panel number as printed on the sticker?

[Redrum]

Re: Panasonic Viera TC-L32U22 no picture

good morning,

I really don't have any way of probing that fine of a pitch on the connector. There must be a test point somewhere.

I have attached a picture of the label on the panel.

Also, I have attached a screenshot of the block diagram to the panel (from the service manual), and two screen shots of the schematic for that 80 pin connector. perhaps if you could point me to what I am looking for, I can trace back to find a tp on the a board.

I ask because I see alot of reference to 13.7v, but none specifically to 12v other than the one area in the previous post. If I am going to test and determine go/no go, I want to make sure I am testing what you are suggesting I test

Thanks;
Jim

[budm]

Re: Panasonic Viera TC-L32U22 no picture

https://www.badcaps.net/forum/attach...3&d=1544132121
LCD panel connector VCOM Pin 2 and 3 are tied together so you can probe on the copper trace, AVDD13.7V pin 5 ~9 are also tied together and connected to r86 so your meter probe should be able to test those pins.
It looks to be that this panel has many Voltage sources to feed that panel.
You can always trace out the connection from the pin that goes to other places so that you can probe the Voltages.