Photointerrupter Interchangeability

Discussion in 'General Electronics Chat' started by Dirus, Jan 9, 2016.

  1. Dirus

    Thread Starter New Member

    Jan 9, 2016
    Looking for a little help on selecting a replacement part for my TV. I have 2 color wheels for the TV and both exhibit the same problem where after x amount of time the colors shift and the screen flickers. 1 of them goes out of sync after about a minute, where as the other will work properly for about 20mins.

    From all the research I've done the part that actually fails is a Reflective Phototransistor/Photointerrupter that is attached to the color wheel. I'm assuming this is what the TV uses to keep everything in sync and seems to be a heat related issue as I came across a post somewhere that said if you hit it with a can of freeze-it? that it will snap back into proper operation.

    The original part is a Sharp GP2S40 However it's been long discontinued.

    It was suggested that I could use a QRE1113

    I know that right out of the gates that the pinouts are different however I'm sure I could rectify that easily enough.

    What I need help with is figuring out what of the listed specs are the ones I really need to concentrate on when sourcing a replacement.

    Any help would be greatly appreciated as a $2 part vs $180 for a new wheel would be awesome :)
  2. sailorjoe

    Active Member

    Jun 4, 2013
  3. Dirus

    Thread Starter New Member

    Jan 9, 2016
    Sharps recommended replacement is a SMT part where as the original is a thru hole design. Not too sure just how much of a pita it would be to try and get it to work on the pcb.

    I did look at the customer interest links as well, however the QRE1113's forward current is 20mA vs 50mA, rise and fall time are 20us vs 50us, collecter voltage is 30 vs 35 etc. The RPR220 is 10us and 30mA.

    Would the faster rise and fall matter? Or should I be more interested in the current ratings etc?