Question about Zenith R56W36 56" Rear Projection Television
I really hope someone can help me with this.
Our LG RT-39NZ40RB rear projection TV has massive convergence problems ever since I ran the "Auto Convergence" feature after moving houses. Jumping onto the most obvious solution, I have already replaced both STK392-570 ICs (and checked all feedback resistors), but the problem persists.
What is particularly curious, and I unfortunately didn't notice this until now, is that the menu on-screen display is out of convergence as the rest of the picture when there is an input signal, but when I switch to an input that doesn't actually have a source connected, e.g. AV4 or the Component inputs, the OSD is perfectly crisp with all 3 colors in line. At the same time it does not make any difference whether the input signal is TV via aerial and tuner, an XBOX via Composite cable on AV1-4 or the same console on either of the two Component inputs. If there's a signal, the display is out of match, no signal and all looks fine.
As I said, I wish I had noticed this earlier as it is pretty obvious that the actual convergence mechanism has been working all along or why should the OSD work without input signal.
Now, what else might be the actual cause here?
I sure hope there's an obvious solution to the problem that I can fix with a little more DIY so that the new STKs haven't been a complete waste.
Thanks in advance for any ideas, Andy
Not a solution, but have the same problem with the LG RT-39NZ40RB, mine also has the STK392-570 ICs, and I am seeking the whole convergence board that has those STK IC's
If anyone can lead me in the direction I would be most grateful.
Also sorry for posting in an old post.
Posted on Feb 13, 2010
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Posted on Jun 20, 2008
Have you check the electrolytic filters. check the video IC. also check the polyster or disk type capacitor, because they hold the frequency. in on screen mode the half of section is dead, but when you applied a signal it start converting it display mode. every signal is extracted from video signal in TV mode. the best way to check all this properly you need a colour pateran generator. when you used it you will find a fault and the area.
best of luck...
Posted on Feb 12, 2008
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Posted on Jan 02, 2017
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