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

[budm]

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

TV unplugged, put the meter in Ohm mode, black lead to the chassis, red lead to the end of the fuse that shows no voltage, see what resistance reading you are getting, we are trying to see if it has shorted circuits, it can be due to shorted MLCC (Muti-Layer-Ceramic-Capacitor), also may have bad regulators IC's.

[kevinm34232]

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

Yes I have 12v on one side and 0 on the other. Assumed it was a fuse and it's not testing good one way like a diode. Like I said I may have blown the fuse by accident with the probe when I was testing..

[Hayneskr]

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

If I disconnect the LVDS#2 cable from the T-Con board my set will turn on and display the exact symptoms that you described. I have sound and backlight but no picture. I spoke with the Philips authorized repair tech in our area and he agreed that the T-Con board was most likely the problem. It sounds like there is a shorted component in my T-con board causing the set to go into protect mode and shutdown.

Did you say that the XD part was open on your board or was it reading 0 Ohms?

[kevinm34232]

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

My TV turns on with backlight and sound but no picture, guy I got it from says he had Sears come out and they diagnosed it as the TCon or Panel not sure, but they said it wasn't available for repair. I think they were talking about the TCon, although there is model TV on ebay right now with a black vertical line so maybe they have panel problems too.

[Hayneskr]

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

Hope you don't mind if I add, not trying to steal your thread. I have the exact same model it will not power on. I did find a T-Con board but it apparently was the last one in the world. www.plasmafix.com.

I've measured the XD part on my T-Con board and it reads a dead short. I tried looking up XD in the SMD Cook book and the same code could be used for different parts. http://www.scribd.com/doc/5752354/SMD-Catalog shows the part could be a zener diode, but not sure.

A schematic for the T-con board would be nice indeed, but I think it was part of the LCD which is manufactured by Sharp...

Ok, found some more info. It looks like it could be a fuse with a 4 current rating but I can't tell for sure which package size, it's either 0805 or 1206.

[kevinm34232]

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

OK will try, also that T-Con board is not available anywhere I could locate and there's another member looking for one on here too...

[multimeter]

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

i think the "xd"part is a fuse also,it looks very similar to a ds lite fuse,if it has blown which you said it showed open,in ohms range measure across the pads and it should be very high resistance,that will tell you that the tcon isnt shorted,if you only get a few ohms then it will indicate a short,these fuses do fail for no reason ,just age really.i say replace with a new fuse if you get high resistance across the pads,and see what happens.

if this dosent work ,then replace the whole t con,there isnt much thats easy to replace on them.apart from that voltage reg i marked in yellow.

[tom66]

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

I would say fuse. T-con for a 52" would draw close to 2 amps at 12V so use a 4 amp fuse for reliability.

[kevinm34232]

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

Still no ideas? I did say that I had 12v on one side of that XD component but not the other side right?

[selldoor]

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

Well I still dont know despite extreme googling perhaps this will help someone identify positively

[multimeter]

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

looking at this a little logically,the smd cap just above the "2 banded component",has its negative mark on it so that is too ground,follow that trace down does it join to the end of the "2 banded component".if it does then the banded part cant be a fuse,thats just like connecting positive and negative together in series with a fuse,and would go bang!the positive trace is where the xd part is

[kevinm34232]

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

I have SM but no schematic of the T-Con. If anyone wants me to email it lemme know.

[multimeter]

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

HMM , a schematic for that t con would enlighten!,hopefully someone will know what xd is,baffled me that one has

[kevinm34232]

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

XD reads .0L and meter is on 200k

[multimeter]

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

What ever XD is it's open in circuit. The cylinder tests 0.00.

if that is a fuse,and your meter was on 200ohm setting,then that"fuse"is good,im a little stumped as to wether it is a fuse !because the marking isnt no where near it !,what resistance reading do you get across "XD" ?

[kevinm34232]

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

What ever XD is it's open in circuit. The cylinder tests 0.00.

[kevinm34232]

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

The voltage regulator is marked 25KA5 8C 36

[multimeter]

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

im not sure what the cylinder with the bands on it are,if that was a fuse,there is room next to it to silkscreen the legend next to it?.

if it is a fuse,ive never seen one like that on a t-con,every smd fuse ive seen is prefixed with a letter ,D being 250ma

[kevinm34232]

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

do you mean the cylinder shaped component a little way from where i marked in red?it has 2 black bands on it?

Yes that's what I thought was the fuse. FYI the fuse you told me to check IS open at this point.

I will post back other info.

[selldoor]

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

Crap that is open but I think I did it myself I think I checked it at first and it was good. Was thinking the component just to the bottom left of it was the fuse and I hit the probe to something saw a spark. Can you point me to a replacement for that on Digi-Key??

Must have been brain dead just checked voltage and have 12v at one side of the fuse. So at least I know now it's getting the voltage however still think there is another problem...

Firstly were you checking the fuse with the power on? or was the spark due to retained charge.

Secondly I believe the Black rectangular component marked XD is a resistor and the fuse is the cylindrical component with the two black bands.