Philips 47PFL7422D/37 backlight comes on, sound works, no picture.

[77slurm77]

I was given an older Philips 47PFL7422D/37 that was no longer working. The TV turns on, the speakers make the "pop" noise, the blue power LED is solid, the green lights on the mainboard are not blinking erratically or anything but I cannot get a picture to come up at all. Pressing the Menu button does not display anything on the screen. I have found a way to use the Menu button in combination with the channel button to switch inputs and the old yellow, white, and red connection is producing sound but no picture.

Any ideas?

[capkid]

Re: Philips 47PFL7422D/37 backlight comes on, sound works, no picture.

My guess would be a t-con issue. The t-con fuse blows in some of these Philips LCD TVs. I'd start there.

[kevinjo]

Re: Philips 47PFL7422D/37 backlight comes on, sound works, no picture.

Believe it or not, I had this TV a few months ago and found a 100uf 16 volt cap worn out. Replaced and everything was fine and is still fine from what the customer says. I have had other Philips with similar issues. So check all 100uf 16v caps and if they test bad..change them. Not sure if it is your issue or not but with Philips..good place to start. This usually happens on the main boards not the power.

[CapLeaker]

Re: Philips 47PFL7422D/37 backlight comes on, sound works, no picture.

Easy check: Check with and oscilloscope the LVDS signal on the main board. Press the menu button on and off all the time, while you are looking at the scope. IF the LVDS signal changes on the scope, you know the mainboard is fine. Also make sure all the fuses are good on the T-Con board. You can try also heating or cooling your boards, see if that yield a result.

[77slurm77]

Re: Philips 47PFL7422D/37 backlight comes on, sound works, no picture.

Thanks for the responses and sorry for the late response. I don't have any tools to test but from what capkid said and seeing a few videos I'm guessing it's the T-Con board. I have ordered a replacement so we shall see. Thanks again everyone! I was about to give up on this thing. I will update the post once the replacement board comes in.

[77slurm77]

Re: Philips 47PFL7422D/37 backlight comes on, sound works, no picture.

My guess would be a t-con issue. The t-con fuse blows in some of these Philips LCD TVs. I'd start there.

This was it!!

I replaced the t-con board and it's working like a champ!

Thanks everyone!

[CapLeaker]

Re: Philips 47PFL7422D/37 backlight comes on, sound works, no picture.

Thanks for the feedback!