[Robotgroup] Troubleshooting TV remote control

[Andre Lamothe]

Boy, the chances of the IR led going are 1 in a million. Definitely scope 
the LED voltage to see what the peak to peak is, some leds have more or less 
forward voltage and the one that it uses might take more or less, so the rad 
shack might not work. The wavelength is probably ok since there's a lot of 
room for error in that with IR. Do you have another set that is compatible 
with the remote, remember, the TV's IR receiver might have went bad :) So 
you are at the wrong end of the problem. But, if you're lucky, sound like 
you have a bad IR LED.

Also, if you really want to be a nerd see if you can find the tech specs for 
the TV online, they always have the remote with them and the wavelength etc. 
of the IR emiiter as well.

Andre'

----- Original Message ----- 
From: "Def Egge" <robodigest at innervate.com>
To: "The Robot Group" <robotgroup at puremagic.com>
Sent: Sunday, February 03, 2008 8:14 PM
Subject: [Robotgroup] Troubleshooting TV remote control



TV remote went south after a night of being lost somewhere in the
interior of a recliner.

Batteries were low - replaced....

Contacts cleaned to be certain....

Confirm that digital camera can detect IR pulses on a working
remote....

Checked for IR pulses with digital camera - nothing....

Checked as much of the analog circuitry as I am able - no obvious
failed components nor broken leads / traces in PCB....

Soldered visible LED across the leads of the IR LED in the remote -
Ah ha!  Visible LED pulses....

Need to replace 5mm IR LED - Rat Shack carries a 1.2V 5 mm IR LED
(940 nm), model 276-143   Problem solved?



-- 

All the best....

Mike

_______________________________________________
Robotgroup mailing list
Robotgroup at puremagic.com
http://lists.puremagic.com/cgi-bin/mailman/listinfo/robotgroup