Panasonic model CT37G24A continuing problems

This is the set that took a serious lightning hit. It was dead with a blown fuse when I first got it. I replaced about ten components so far in the power supply and startup circuits. The last remaining 4 problems were: that the set was stuck on one channel, the sound was moderate and would not change, the remote would not work, and the "action" button would not invoke the menus. I just replaced the microprocessor and this has fixed the channel and sound problems, but the "action" menu and the remote still will not work. My scope fell off the cart yesterday and so its not working either so I can't look at the output of the remote receiver. This has been a real dog. I've tried several receivers out of other sets but I still can't get the remote to operate. I've never found the receivers to code sensitive. I thought that any receiver would send an adaquate signal to any micro,.as long as it works on 5V. Is this correct? The input and output DC voltages on the receiver are correct. This is like a "closed" circuit with just a few components from the receiver into the micro so I can't imagine what else could inhibit the remote from working. Can I check the receiver with anything other than a scope? Does anyone think that there could still be some common problems causing these remaining two fuctions not to work? I gotta stop taking in these lightning jobs. Thanks, Lenny

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captainvideo462002
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On Sat, 11 Oct 2008 05:43:04 -0700 (PDT), " snipped-for-privacy@yahoo.com" put finger to keyboard and composed:

AFAIK, the IR signal is most often modulated on a 38kHz carrier. If your set uses a different frequency, then the sensitivity of any 38kHz replacement sensors may be too low.

Why not hold down the Volume key on your remote and monitor the receiver's output with a DMM? Assuming a +5V supply rail, a continuous pulse train should show up as a DC level somewhere between 0v and +5V.

Or you could hook up an LED to the output, buffered with a transistor if necessary.

- Franc Zabkar

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Franc Zabkar

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