Panasonic remote control model# eur7603z9a

Jim,
While checking the LED with the diode test setting on my multimeter
(to supply power), I viewed the light from the LED through my camera
on my cell phone.

thanks,

Bill

Hi, A common problem is moisture leachate through the rubber membrane shorting multiple contacts on the board. the micro interprets this as an illegal command and will output nothing. Clean the board and rubber contact pad with isopropyl alcohol and lintfree cloth. If the remote is a universal type, i.e has functions for DVD/TV etc, then pressing those buttons has no output function other that to instruct the micro to output the following commands to drive that device. The crystal will only have signal when a transmitting button is pressed . you can test both the crystal and IR led for activity by setting your DMM to ACvolts range and with the negative probe connected to battery -, test each side of the IR led and similarly the crystal by simultaneously pressing a transmiitting button. you should see some activity namely a volt or two. ideally a scope should be used if available as this will not load the circuit like a multimeter. As stated above, a camera is a quick and ready test to visually comfirm the ability of the IR Led. I have seen many remotes that test electrically good but have no light output

Not new. Common practice.
--
Al, the usual

LolI learn something new every day...I would have never thought to
use a camera to view infrared activity. My hats off to you for your
ingenuity.

Jim

How did you check the infrared led? I have found the even tho the
infrared LED can check ok with a voltmeter test, it still may be bad.
I always check my remotes with a little card available Radio Shack. If
the remote is transmitting the little square on the card will light up.
A dim room is better for checking as the card doesnt light up all that
brightly.

JIm