And I'll add to stratus46's post #20...
The receiver-end I/R diode could be comprimized with dust over it, or inside the window itself.
I've had numerous TV's, VCR, etc, come in the shop with loads of dust or sticky cigarette-film/dust buildup causing weak or non functioning.
The receiver-end I/R diode could be comprimized with dust over it, or inside the window itself.
I've had numerous TV's, VCR, etc, come in the shop with loads of dust or sticky cigarette-film/dust buildup causing weak or non functioning.
Ceramic resonators were the most often root cause of all remote issues I've seen and repaired (after the usual check like battery & IR LED solder joints and similar). IR LED pins' cold solder joints were up there as well...
Just recently, I had an interesting issue with the HOLO May DAC remote.... which I could not figure out for a month or so... it was driving me nuts....it would work, and then stop working for no apparent reason (after I did all the checks and what not...).
In the end, I washed the PCB in alcohol to remove all soldering residue (flux). There was just a tiny bit of flux around the ceramic resonator (through-hole part, so it was soldered manually after the PCB was assembled/soldered with all SMD parts.... of course, the flux wasn't cleaned around the resonator area, which also (the flux) spilled a bit to surrounding SMD tiny little caps)... and that fixed it for good. The remote hasn't skipped a beat since.
Just recently, I had an interesting issue with the HOLO May DAC remote.... which I could not figure out for a month or so... it was driving me nuts....it would work, and then stop working for no apparent reason (after I did all the checks and what not...).
In the end, I washed the PCB in alcohol to remove all soldering residue (flux). There was just a tiny bit of flux around the ceramic resonator (through-hole part, so it was soldered manually after the PCB was assembled/soldered with all SMD parts.... of course, the flux wasn't cleaned around the resonator area, which also (the flux) spilled a bit to surrounding SMD tiny little caps)... and that fixed it for good. The remote hasn't skipped a beat since.