Panasonic dp42d23

[superbob8]

Hi
I have a tv with a blank blue screen and no sound can you help troubleshoot the issues .I am posting some pics also

[ReeceyBurger123]

Re: Panasonic dp42d23

Do you have a DMM ? Also checked the Tcon fuse ?

[superbob8]

Re: Panasonic dp42d23

I have not checked the tcon fuse where exactly is it located ? I do not see any fuses on any of the cards ?

[martyparish]

Re: Panasonic dp42d23

The title says Panasonic but the tag on the back says Sanyo.

Picture #3 is the tcon. The small white smd part with gold ends(near connector) appears to be the fuse.

Picture #4(the main board) it appears that the ribbon cable is not all the way in. Check that for sure.

[ReeceyBurger123]

Re: Panasonic dp42d23

Sanyo was a part of Panasonic but they sold the brand off very fast to other cheaper oems.

[superbob8]

Re: Panasonic dp42d23

The title says Panasonic but the tag on the back says Sanyo.

Picture #3 is the tcon. The small white smd part with gold ends(near connector) appears to be the fuse.

Picture #4(the main board) it appears that the ribbon cable is not all the way in. Check that for sure.

Hi Marty
The fuse has continuity ( I guess I am used to easily replaceable fuses and the connector is in all the way what else can I check and what board usually creates these symptoms where it is a blank blue screen and no sound and nothing else ?

[superbob8]

Re: Panasonic dp42d23

yes and I tested the fuse on the tcon could it be the board ?

[martyparish]

Re: Panasonic dp42d23

Have you tested all the pins on the power board connector? Make sure that the 5v and 12v rails are correct.

Also, test that tcon fuse while tv is on to see if power exists.

Is the on screen display available? (press menu btn)

[martyparish]

Re: Panasonic dp42d23

I'm not keen on throwing parts at a tv, but dang these parts are cheap! ($32 main, $8.50 tcon on usa ebay)

[superbob8]

Re: Panasonic dp42d23

Hi Marty
thanks for the help
no the screen does not show the menu
how do I test that the 5 and 12v rails -where are the test points

[superbob8]

Re: Panasonic dp42d23

I'm not keen on throwing parts at a tv, but dang these parts are cheap! ($32 main, $8.50 tcon on usa ebay)

Hi Marty I bought the tcon board from ebay and would that give me a blue screen if it was defective ?

[martyparish]

Re: Panasonic dp42d23

I would have done the voltage tests first before ordering.

For power supply: Test the pins on the connector that go from psu to main board. The pins are labeled.

For tcon: measure the voltage on both sides of the fuse while set is on.

For both measurements, use the metal chassis of the tv for ground.

I was leaning towards main board failure but never know...

[superbob8]

Re: Panasonic dp42d23

Hi Marty
where can I get a schematic for the dp42d23 sanyo or panasonic tv ?

[dick_barton]

Re: Panasonic dp42d23

Hi Marty I bought the tcon board from ebay and would that give me a blue screen if it was defective ?

What was the fault prior to changing the TCon board?

[superbob8]

Re: Panasonic dp42d23

Hi Dick
the screen is blue and pressing input will not do anything I changed the Tcon board but I still have the same symptoms ?

[Alastair E]

Re: Panasonic dp42d23

With all PSU supplies OK, It'll be Mainboard issue or the panel itself...
--Unless of course, You fitted a similarly faulty T-Con!

[martino]

Re: Panasonic dp42d23

Did you try disconnecting one of the ribbon cables at the T-con? The white ones that go from t-con to panel?

Disconnect left ribbon,try tv,reconnect left and disconnect right one. See if you get a halve screen on one of those.

[dick_barton]

Re: Panasonic dp42d23

Have you tested the power supply as martyparish has previously suggested and what dc voltages do you get?

[superbob8]

Re: Panasonic dp42d23

Have you tested the power supply as martyparish has previously suggested and what dc voltages do you get?

Hi
I measured the terminal and the 5 vdc were present but no 12 vdc was to be found
so what could be causing the 12 v to not be present ?

[dick_barton]

Re: Panasonic dp42d23

Hello superbob8
In order to help you and without the TV in front of us and having now previous knowledge of the TV you need to provide as much information as possible.
The connector I highlighted, can you list the names of the pins and what voltages are on each of them in turn. The name of the pins are written above the connector but I cannot make them out from you picture.

If you have 5v but not 12v then we need to know what voltages are on those pins. Please can you list all the pin names and what voltage you read alongside the name so as to give us a clue if it is a mainboard or power supply fault.