42pfl7422d/37 very slight flickering of image

[ztu165]

Hey guys, I bought a TV from a guy that said his Philips TV had no more picture. He stated one day a few weeks ago he turned his TV on and it failed to show a picture, but he can hear the sound. I bought the TV from him today, I came home pluged it in, turned it on and what do you know, the TV turns on, the backlights are on and I can see the picture and hear sound. Only problem is that I can see a very slight flicker of the picture especially noticeable on white image. I proceeded to inspect the inverter boards and they look absolutely fine. These inverter boards however are not the OE inverters. They must be compatible replacements as they do not align to the screw holes of frame. What do you guys think?

[tom66]

Re: 42pfl7422d/37 very slight flickering of image

Check the inverters for signs of bad capacitors.

[ztu165]

Re: 42pfl7422d/37 very slight flickering of image

Check the inverters for signs of bad capacitors.

Hey Tom thanks for helping me out, I checked inverters and everything looks good. I checked those caps while TV is on and I get 24v on all of them. Where else can I go from here? I also want to say that it's really not a flicker, but a bunch of thin transparent lines cascading down from the top of the TV and it's really not a problem unless the image is white or a light color.

[tom66]

Re: 42pfl7422d/37 very slight flickering of image

Consider reseating the LVDS cable. If you need more help, you will have to post pictures.

[ztu165]

Re: 42pfl7422d/37 very slight flickering of image

I'm having a hard time getting them to show up on pics or video.

[ztu165]

Re: 42pfl7422d/37 very slight flickering of image

Consider reseating the LVDS cable. If you need more help, you will have to post pictures.

Tom here's a few videos I made for you to check out.

First video is of the actual problem on the picture.
http://www.youtube.com/watch?v=1Ug6j...ature=youtu.be


2nd video is of me checking the voltages on the mosfets upon first power up. I get a Low voltage reading on the master inverter as you can see.
http://www.youtube.com/watch?v=eMOyP...ature=youtu.be


3rd video is of me checking the voltages again after turning tv off and back on. On second voltage check the voltages are not low like the first test.
http://www.youtube.com/watch?v=xxESe...ature=youtu.be

[ztu165]

Re: 42pfl7422d/37 very slight flickering of image

Guys I have replaced all caps, voltage regulators, and IC's and I managed to make the lines go away, but the flickering is still there. I know the problem is with the inverters because I swapped inverters from another Philips tv and the flickering was not there any more. What else can I do?

[tom66]

Re: 42pfl7422d/37 very slight flickering of image

None of your videos show up. They all "do not exist".

[ztu165]

Re: 42pfl7422d/37 very slight flickering of image

I know guys I'm sorry I just noticed that also. I don't know what might have happened, they worked perfectly before.

[tom66]

Re: 42pfl7422d/37 very slight flickering of image

Can you try reuploading them?

[deaner00]

Re: 42pfl7422d/37 very slight flickering of image

Hello - Did you ever figure out this problem? I am experiencing the same issue.