🚀 go-pugleaf

In article <1992Apr11.010124.6186@newstand.syr.edu> 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?
>

It's often the keypad that goes, not the electronics. The conductive rubber
pads on the buttons wear out, and don't connect any more. Check the buttons 
that you don't use much, and see if they don't work either. Also, clean the
PCB  under the keypad - if one of the buttons is permanently shorted, the
others won't work.

I don't know how reliable the LEDs are, but they tend to have a much higher
forward voltage drop than an ordinary silicon diode - about 1.6V. This may
be too high for an ohmeter, so it will indicate open circuit both ways.
Test it by connecting up a voltage source & series resistor to limit the
current to about 10mA, and measure the voltage drop over the diode.

-adrian

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Adrian Godwin                                        (agodwin@acorn.co.uk)