42inch plasma tv turn on/off automatically (generic brand? : Fluid)

[xoxid]

Hello! And thanks you for clicking on my thread


My Tv, today, started to turn on/off on it's own for some odd reason.

What I know so far:
I plug it, it turn on(automatically), wait a few secondes, turn off(automatically). 2 secondes later, it repeat. Turn on, off, on, off, .....
When it turn on, I can change the source if I am quick enough. It is currently set on TV(cable), was on HDMI when the issue started
I checked most caps. They look fine, but I don't know how to check them more deeply.
The tv brand is FLUID. Inside the TV, I noticed a SAMSUNG branding.
ALL the fuse that I found (3) are Okay

I am not a total newbies in electronic (I can solder, and I know how to use a multimeter. I have a decent digital one, if that can help)

Here is some pictures of the tv:








Could anyone help me to identify what could cause this issue, and what part to replace?
Thanks you very much!







Edit: I did an edit to add the models/brand in the thread title, but it doesn'T show in the thread list. Sorry

[xoxid]

Re: 42inch plasma tv turn on/off automatically (generic brand? : Fluid)

I have removed every metal part to check the electronic that was hidden. I see no damaged caps.
The tv have sound when it reach a source (most time, it is not on long enough to reach a source)
That problem is really odd..

[tom66]

Re: 42inch plasma tv turn on/off automatically (generic brand? : Fluid)

The plasma panel and driver boards are made by Samsung, everything else is made by an OEM who "Fluid" bought from.

As for the fault, have you tried with the side button assembly disconnected?

[xoxid]

Re: 42inch plasma tv turn on/off automatically (generic brand? : Fluid)

Thanks, I did not know about such deal before.

At first, I tough.. Tom is crazy, the button doesn't seem to be stuck.
But then I gave it a go. After 5 minutes of removing the glue over the plug of the side button, I managed to disconnect the assembly.

I digged deep into my box to find the remote control (Never used it, as the tv was used as a computer monitor)

And then I turned it on.. and it's still on!

You are a genius, and you just saved me the price of a new tv. I Love you Tom, if there is anything I can do for you, let me know!

Thanks thanks thanks!

[tom66]

Re: 42inch plasma tv turn on/off automatically (generic brand? : Fluid)

Great to hear, sometimes the simplest things are at fault.

A picture of the VS/VA sticker would help for a project I am doing -- characterising plasma panel voltages over time. (Generally an increase in Vs, decrease in Va.)

Plasma panels are really hard to make, there are only three main manufacturers, Samsung, LG and Panasonic, so whenever you get a plasma TV it's guaranteed to use one of those panels, so you're rarely losing on reliability (of course Samsung and LG have lots of reliability issues on their own...)

[xoxid]

Re: 42inch plasma tv turn on/off automatically (generic brand? : Fluid)

I am extremly sorry, I just finished to screw it back together without seeing your message..

If you really need the photo, let me know. For you, I will re-open it ;-) You will just have to show me where the sticker is.

[tom66]

Re: 42inch plasma tv turn on/off automatically (generic brand? : Fluid)

Never mind, it's not important enough -- enjoy the TV!

[xoxid]

Re: 42inch plasma tv turn on/off automatically (generic brand? : Fluid)

Hey Tom66

I have some good news for you. A friend who had the exact same tv in the usa will be sending me the side button panel from his tv(A santa claus landed in his screen, ruining it, long story).

As soon as I receive it, I will have to open the tv again, so I will take your picture ;-)

Can you tell me aproximately what I am looking for?

[Th3_uN1Qu3]

Re: 42inch plasma tv turn on/off automatically (generic brand? : Fluid)

A large sticker on the back of the panel, where you will find noted some voltages and their suggested values. Va, Vs and so on.

Stuck buttons are a fairly common issue, and are usually the first thing to check when the TV is switching on/off by itself, changing channels or volume, or displaying the menu at random. They don't have to be physically stuck either - it's enough for some small metallic debris or oxide to make its way inside, and the button will think it's pressed.

[tom66]

Re: 42inch plasma tv turn on/off automatically (generic brand? : Fluid)

Each plasma panel is made differently. A variation of just +/-1% in the panel gas pressure corresponds to a variation of over +/-10% in the Vs voltage. So the sticker tells you exactly what the panel should be set at for optimum performance.