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

[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.

[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 12V(11.96V) before and after both fuses.

[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.

[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.

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.

With bad T-Con board backlight would come up first with blank blue screen then yes go off and them back on with black screen no OSD.

With good board it comes up same except you have Philips logo on screen, then goes off, then back on to normal display with picture and OSD.

[tibimakai]

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

Blue screen it's a T-con problem?
I don't have anything displayed, just backlight. It seems like the backlight it starts up twice. It turns on (the backlight), then becomes black and then turns (the backlight) on again.

[kevinm34232]

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

I found a board from a guy in Portugal which I'm still waiting for it to arrive. I then of course found 1 on ebay the very next day (of course at a much higher price) which is the one that is in the TV now being tested for the last week.

When I first replaced the SMD fuse in the original T-Con it worked for about 3 days before it quit again to blue screen. When I checked it later the fuse was still good so I don't know what is going bad on these boards.

I also have a 47" Philips same chassis 9.1, similar no raster problem, waiting on a new T-Con board to arrive to see if same problem.

[tibimakai]

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

From where did you buy it?
I'm surprised that mine it worked for hours and most likely if I hadn't touched it, it would have worked even longer.

[kevinm34232]

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

I found a T-Con board and it is working fine for a week now... I may wind up with an extra T-Con board aswell..

[tibimakai]

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

Any new development?
I have just picked up one myself.
It seems that previously it was opened. Somebody did not reinstall properly the panel's ribbons.
After reinstalling them correctly, the TV run for hours without issues.
After a while I have decided to to a firmware upgrade and turned it off and then on again. Since then the video it was gone again.
Firmware upgrade did not show up on the screen and I had a movie playing, so the sound it was still on.

[kevinm34232]

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

Fuse still tests good now so something else going on, no voltage on IC201. Think I may have found a replacement T-Con though.

[kevinm34232]

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

Yes new one was fast blow but beleive old one was too..

[tom66]

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

Different type of fuse? Original may have been antisurge or slow blow. New may have been fast blow. There is little harm in using a 6.3A or 8A fuse, as any short to ground will easily blow it.

[kevinm34232]

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

Looks like it could be it will have to check voltages
http://www.digikey.com/product-detai...-E2-ND/2337075

I think we checked resistance from chassis ground to blown side of fuse and it was high, what else could cause it to blow after several days??

[selldoor]

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

BD25KA5FP this more like it?

[kevinm34232]

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

It looks like a voltage regulator, please see post #6

[selldoor]

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

What is it /does it look like - there are these diodes
30KPA58CA Transient Voltage Suppression Diodes Axial Leaded - 30000W Littelfuse
30KPA58CA 30KW Transient Voltage Suppressor
15KPA58CA 15KW
UMA58CA


A58C being the base

[kevinm34232]

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

IC201 is marked 25KA5 8C 36 can anyone find that??