Simplest VGA tester on PIC

There are still lots of displays with VGA around us. So when repairing or testing them VGA tester become a handy tool. Technikservice suggests using a simple PIC based VGA tester that require very few parts including PIC microcontroller, 4MHz crystal, cap and potentiometer. Of course a VGA connector is also required.

Design is based on Eric Schlaepfer scheme that generates VGA signal in 640×468 mode at 60Hz refresh rate. Circuit simply emits a “TEST” text message on screen which is enough for simple checking.

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