Author Options:

Half Inch CRT Monitror Answered

I was tearing apart an old VHS camera and decided to rip the LCD out of the viewfinder. Much to my suprise I find a CRT monitor not a LCD! This screen is about 1/2 inch. It has a 5 pin connector that leads to the motherboard and a chip on the bottom that says A118121. Obviously two of the conections would be V+ and ground, but what about the other three? I would like to turn this into a composite or VGA compatible screen (maybe even a crazy tiny oscilloscope) but I need some help. Any suggestions or leads would be greatly appreciated.


I just took apart a old and broken VHS-C camcorder and saw a LGR video on a half inch CRT and thought it would be a cool progect I just need help on some of these pins.


On my View Finder piouts is:
Brown = Unknown
Red = GND
Orange = Composite Video Inp
Yellow = +5V (not +12V !)

Pinouts for Your View Finder is overhere: http://www.insideelectronics.co.uk/camcorder-viewfinder-crt/


I have a very similar View-Finder, on the board is IC A118121, connector is 4-pins: Brown, Red, Orange, Yellow. Pinouts is unknown :-( .

Thanks, but I actually figured it out before you posted this.

Any chance you can share your findings on what wires go where for that 5-pin connector?

yes. I'll need to find where I wrote it down and then I'll let you know. I was able to add an external composite video input too. It turns out these things receive a composite video input from the camera.

It's all good now, I figured it out by trial and error. I don't know why I didn't look into these little viewfinders earlier!


9 years ago

as far as I know the pins would be (not in order)V+,Gnd,Vid,Vid Gnd,CONT.

I don't have any suggestions, but I have to say that is really cool!


9 years ago

Id imagin they are in no particular order Gun heater Accelerator grid Vertical Scan Horizontal scan and presumably a common ground,


9 years ago

odd coincidence! i have what looks like exactly the same viewfinder in pieces on my desk at the moment. was yours from a panasonic camera? I've been meaning to try and do something with it for a while, have you had any look displaying anything?

Actually i think mine might be slightly different , it doesn't seem to have the 5 pin connector, and the board is slightly different dimensions.


Mine had 5 pins. Sadly I accidentally deleted my build photos so I can't make an ible. I can post my pinout though. Mine was RCA. It is actually a composite input. Who knew?

Thanks for any input, but I actually got it all figured out before Spoonty made his post. I will post an instructable tonight.