Philips 52PFL5704D/F7 Sound and Backlight, No Video.

[tibimakai]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

Mine doesn't show anything on the screen, just backlight.
When it worked correctly for a couple of hours, first showed the Philips logo.
So, with mine could be the mainboard?

[kevinm34232]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

Yours is doing the same as mine did, it was the T-Con board that would not display Philips logo or a picture and on screen menu, etc., not the main board.. Are you getting the 12v at the t-con fuse?

There has been a lot of T-con board issues posted online with this model and turns out to be a hard to find board..

[tibimakai]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

I haven't tested yet anything, because yesterday I thought that I fixed it and then late in the night the screen went black again.
I will measure it today and I will let you know.

[tibimakai]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

I have 12V(11.96V) before and after both fuses.

[kevinm34232]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

Are you getting anything at IC201, you should have 3.3v on top pin and 2.5v on bottom. I think when I had the blank screen with old board, I wasn't getting those voltages but fuse was good.

[tibimakai]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

I have forgot to measure those voltages. Tomorrow.
I have measured yesterday and today again, just to be sure and something it's weird with the PS_ON.
When it's off it measures 3.4V and when it's on it measures only, 0.0042V.
What's up with that?
The stand by voltage is 3.4V on this TV?
3.4VSB is the standby? What is 12VSSB?

Picture made with my phone.

[tom66]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

Looks like active low PS-ON, that is fine. Some PSUs, especially Samsung, are like that.

12VSSB is for 12V for Small Signal Board, i.e. main board.

Perhaps it failed due to the fuse being underrated?

[tibimakai]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

My fuses are OK. That's what is weird.
So basically when I got it it showed as right now only backlight.
I have opened it and noticed that both panel ribbons were not in there correct position. I have reinstalled them correctly and the TV run beautifully for hours.
Then I turned it off to insert the USB stick with the updated firmware and the video signal it was gone, only audio it was on.
How come it run perfectly and then when I turned it off and then on the video it was gone? Maybe then something went bad?
I have tried heating the board, nothing happened.

[tom66]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

Maybe updated firmware broke it?

[tibimakai]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

I was thinking about that too, but it didn't have enough time to run through the firmware, it didn't have any image when I have turned it on.
When it fully turned on I could hear the movie that it was running previously, so it wasn't doing the update.
Do you think that I should stick the USB stick again and let it run for a while?

[tom66]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

You have a scope, so post a picture of the LVDS connector on the T-con side and I'll show you where to probe to see if you are getting any differential TX signals for the high speed video (here is where 100 MHz is necessary), that way, you can either eliminate the main board or t-con.

[tibimakai]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

Here is shopjimmy's picture.
Kevin, I have just remembered that I have checked the IC201 voltages yesterday and they were all 0V.

[tom66]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

OK which end does video come in? That looks like a dual link (two video streams) T-con.

[tibimakai]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

Both cables are hooked up to the main board. Not sure what are you asking. The right one goes to the main IC on the main board and the left one goes to a bunch of SMD components.

[tom66]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

Which end does the main board connect to on the T-con. I'm not sure which end drives the LCD and which end receives the video from the main board.

[tibimakai]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

Here is shopjimmy's picture:

[tibimakai]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

Tom, I haven't given up on that Sharp TV, I will send you that picture with the scope.
Now this Philips TV takes the whole space on my workbench and I can't work on that one.
How nice it would be if we could help each other through Skype.

[tom66]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

Sorry I'm lost. Which side of the T-con is connected to the main board.... I don't have the time for skype sorry, I am only doing this in my work breaks.

[tibimakai]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

Both

[tom66]

Re: Philips 52PFL5704D/F7 Sound and Backlight, No Video.

TOP or BOTTOM? I need to know where the video comes in from the main board to tell you where to probe...!