Question about Zenith R56W36 56" Rear Projection Television

3 Answers

Convergence problem - NOT STK ICs / resistors

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

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  • Andreas Klein Feb 12, 2008

    Thanks ini79.

    I did an optical check of all electrolytic caps to see if any of them were showing the obvious signs of damage. Nothing there. Unfortunately I don't have the appropriate means, or knowledge as a matter of fact, to follow up on your solution. I'm afraid the problem proves too hard to find for me. Anyone need a Convergence Board for an LG RT-39NZ40RB with two brand new ICs? ; )

  • Anonymous Jul 10, 2008

    Model Number...LG RE 39NZ40RB

    I have a similar problem but just the convergence is out no matter what source...Can anyone provide information on how to access the service mode?

    Thankyou

    Mike

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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.

James

Posted on Feb 13, 2010

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I NEED THOSE PARTS BAD (607-291-4034) ANYTIME PLS CALL ME ASAP 24/7 ASK FOR CHUCK

OR I CAN CALL YOU FREE LONG DISTANCE.

Posted on Jun 20, 2008

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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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ladywinn
  • 5138 Answers

SOURCE: Convergence problem with my LG RT-39NZ40RB,

Call Encompass Parts Distrubtion 1-800-638-3328

Posted on Feb 13, 2010

Testimonial: "Will check this out, thanks for your help...."

  • 11800 Answers

SOURCE: Does it make any diiference

No difference whatsoever - the 570 has a smaller polarisation current requirement, fully assured by the rest of the components.

Posted on Sep 11, 2010

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