42PFL7422D/37 Philips Screen Flicker issues

[deaner00]

Hello - I read (or tried to at least) through all the forums for my tv. My set had gone out a while back. After reading through the posts, I decided to replace the inverters. It seemed they were the cause of most problems with this model number. I replaced those this morning. Screen comes back on and has been on for about an hour and a half now. That's all good. The problem now is that the screen flickers. It's especially noticeable and hard on the eyes when viewing light colors like the blue/white Philips menu screen. Also, the over all brightness of the screen seems low and the lower half of the screen is darker than the top. I tried to capture this in a video:

http://youtu.be/VoMO3CEjCZg

Any help or suggestions would be greatly appreciated.

[stj]

Re: 42PFL7422D/37 Philips Screen Flicker issues

probably the tubes or tube connections.
and that probably took out the oringinal invertor circuit.

[selldoor]

Re: 42PFL7422D/37 Philips Screen Flicker issues

Did it flicker before it "went out"
Try turning the brightness down a bit.
Try a factory reset.

[deaner00]

Re: 42PFL7422D/37 Philips Screen Flicker issues

Did it flicker before it "went out"
Try turning the brightness down a bit.
Try a factory reset.

Hello selldoor - It did not flicker before it went out. The flicker is still present with the brightness all the way down. I've tried quite a few different combinations in the tv settings, but nothing seems to work. I will try a factory reset next.

[deaner00]

Re: 42PFL7422D/37 Philips Screen Flicker issues

probably the tubes or tube connections.
and that probably took out the oringinal invertor circuit.

Thanks for the reply stj - Is there a way to test/fix the the tubes or tube connections?

[deaner00]

Re: 42PFL7422D/37 Philips Screen Flicker issues

Still the same flicker and lower half darkness after factory reset. Anything I can test?

[stj]

Re: 42PFL7422D/37 Philips Screen Flicker issues

if you disconnect the panel from the main board, it may stay on without a picture.
if it does, does the backlight still flicker?

[selldoor]

Re: 42PFL7422D/37 Philips Screen Flicker issues

Thanks for the reply stj - Is there a way to test/fix the the tubes or tube connections?

Yes but its not easy - there are videos on youtube of changing bulbs and
several accounts in this forum.
You can also make up test bulbs from cfls 13w or less see posts by budm
- link in his signature.

Please post pictures of the inverters ( were they new or just pulls)
and (if there is one on this set- cant remember) the distribution board that the cables from the inverters go to.

[-goodtimes-]

Re: 42PFL7422D/37 Philips Screen Flicker issues

I have the same thing happening. My picture went out. I replaced the inverter boards with NEW alternative boards (confirmed compatible replacements). Picture is back with the same exact symptoms as the OP stated. I am considering having ShopJimmy rebuild my original boards, but I am not sure the problem is with the boards as they were brand new. The flicker was definitely not there before I lost my picture. I did notice that if I turn the contrast all the way up to 100 it almost goes away, but the picture does not look so great that way.