Panasonic Viera TC-L32U22 no picture

[pr0cess0r]

Hello, the tv turn on but there is not picture and the power ligh stay on. I think it may be a firmware probleme and im wondering if there is any recovery possible. It must be fixable since some site ask core charge for replacement board.

[tw2005]

Re: Panasonic Viera TC-L32U22 no picture

grab a flashlight and shine it into the screen, the image may be there but the backlight not on.

[dick_barton]

Re: Panasonic Viera TC-L32U22 no picture

You need to carry out some checks before you write off the main board. The power led is on so it looks like your standby voltage is working. Now you need to check that you have all the other voltages given on the power supply board .

Manual available for download from

[pr0cess0r]

Re: Panasonic Viera TC-L32U22 no picture

I will test the tv for sound on all input but what i know is that the backlight is on but the standby led stay on. That why i think it is controlled by the mainboard and it dont post or something like this. i will try to find some service manual since there is no voltage on the pcb. All caps look good and they are rubycon.

[dick_barton]

Re: Panasonic Viera TC-L32U22 no picture

i will try to find some service manual since there is no voltage on the pcb.

I've pointed you to a link for the service manual in the post above.

[pr0cess0r]

Re: Panasonic Viera TC-L32U22 no picture

i got the service manual and they have TP listed but im not able to find them at all .

I did some more testing.

HDMI connected to PC and its detected by the computer but no picture.

When i change input i get different backlight level.

I whas not able to get sound with hdmi.

and here are all voltage at the A03 connector.

tv_on
1=0
2=1.8
3=2.9
4=.09
5=5.98
6=3.25
7=2.32
8=0
9=18.54
10=0
11=12
13=12
13=0
14=6.09
15=6.09

tv_off
1=0
2=0
3=0
4=0
5=0
6=0
7=0
8=0
9=10
10=0
11=0
13=0
13=0
14=6.09
15=6.09

[dick_barton]

Re: Panasonic Viera TC-L32U22 no picture

Can you post pictures of A03 connector and power supply board
Is the connector a 16 pin connector?

[pr0cess0r]

Re: Panasonic Viera TC-L32U22 no picture

[dick_barton]

Re: Panasonic Viera TC-L32U22 no picture

The connector is labelled 1 - 16 in the 2nd photo but you only give 1 - 15 in your readings. Can you resubmit please 1 -16 since I don't know which one you have left out.

[pr0cess0r]

Re: Panasonic Viera TC-L32U22 no picture

1-16 is P2
1-15 is A03

i did some more testing i got sound working.

The screen is not black but more like dark gray like a tv that is on and have backlight but black picture. Id i disconnect LVDS cable i get same picture.

[pr0cess0r]

Re: Panasonic Viera TC-L32U22 no picture

look like

1=15
...
15=1

16 is empty

[Diah]

Re: Panasonic Viera TC-L32U22 no picture

common, they ask you at first yours post to use torch light on the screen, you have dead back light of sure

[pr0cess0r]

Re: Panasonic Viera TC-L32U22 no picture





You see backlight

[Diah]

Re: Panasonic Viera TC-L32U22 no picture

this is still nothings, use tourch light and go in menu first , and check gama brightness ...light it may values zero

[Diah]

Re: Panasonic Viera TC-L32U22 no picture

this is still nothings, use tourch light and go in menu first , and check gama brightness ...light it may values zero

you can do this as shown in manual

Self-check indication and forced to factory shipment setting:Produce TV reception screen, and while pressing [VOLUME ( - )] button on the main unit, press [MENU] button on the remotecontrol for more than 3 seconds.

[dick_barton]

Re: Panasonic Viera TC-L32U22 no picture

Can you find the following measuring points and give the results where it says TCONxxx

[pr0cess0r]

Re: Panasonic Viera TC-L32U22 no picture

i alredy did this. i also did a firmware update from sd card... to me its 100% sure that back light is working properly. look like no lvds signal. is there any fuse on this signal i dont know.

[dick_barton]

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.

[Diah]

Re: Panasonic Viera TC-L32U22 no picture

Can you find the following measuring points and give the results where it says TCONxxx

this is only for mini lvds module..

[dick_barton]

Re: Panasonic Viera TC-L32U22 no picture

Hello Diah, I cannot seem to locate anything relating to the Tcon board other than it being integrated within IC8001. Have I missed something?