🚀 go-pugleaf

In sci.electronics, ldstern@rodan.acs.syr.edu (Larry Stern) writes:

>To all: a neighbor of mine has a 6-7 year old Sony Trinitron, which works
>well except for the remote control. The remote had an intermittent problem
>where it would work fine for a few weeks, not work at all for a few days,
>start working ok again, etc. It seems it is now, finally, dead. There is
>one IC, a crystal, a few resistors and caps, and an LED inside. My question
>is, what usually goes? Is this worth fixing? And finally, can this LED be
>tested with an ohmeter like a "regular" diode?

Larry,

I don't want to state the obvious, but I certainly would double check the
battery. The intermittant nature makes me a bit suspicious.

After that, give it a real close visual inspection. These things are dropped
often and hairline cracks in the pc board or loose solder joints can
cause intermittant problems. The LED can be tested normally, but I woould
imagine that the "diode" could test okay even if it were not emitting light.
Also take a look at and measure the resistor in series with the LED. Some of
them were under-rated in some remote control units. This can result in an
open or high-value resistor and poor or no operation.

I have used an ECG replacement sucessfully in a defective remote control.
You should also keep in mind that the problem could be in the receive 
circuitry in the TV.

Good luck, 73, Ed.

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Ed Hare, KA1CV                  | ehare%arrlhq.UUCP@uhasun.hartford.edu
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