VGA signal generator repair

I bought this VGA signal generator module years ago from some web shop in China. It is designed to easily test your VGA monitor(s) (VGA/SVGA/XGA) with this handy tool. It can be also used as a general purpose video signal source when testing other video equipment that take in VGA signal (like video switchers, converters, scalers, etc..).

20230320_083827

It looks like to be the same as this VGA Signal Generator – 15 Selectable Signals that is advertised as
“Simple and compact color generator.for testing and adjusting VGA/SVGA/XGA display devices such as monitors, projectors, etc
15 selectable Modes covering common Resolutions, Frequecies, & Sync. Polarity. With LED Mode Display & Power switch”
The device support four most common VGA resolution modes: 640×480, 800×600, 1024×768 and HV8-1,HV8-2,HV8-4 and HV8-8

Here is the operation instructions and supported video modes list from the manual:

vgatester

One day it did not work. The colors on the monitor were off and I could not see all colors. I found out that one RGB component (R) was missing. I did debugging and found out that where was bad soldering on the one PIC 16F84 microcontroller pin (the one on the corner). Re-soldering it made the unit to work well again.

screenshot_20230320-090102_gallery

Links for DIY PIC processor based VGA signal generator projects:

16F84A VGA Test
https://www.instructables.com/16F84A-VGA-Test/

16F84A VGA Test – How to Connect a Computer Monitor to PIC16F84A
https://www.youtube.com/watch?v=pcXeEb4dy60

VGA Tester using PIC Microcontroller
https://www.eeweb.com/vga-tester-using-pic-microcontroller/

VGA output with PIC Microcontroller
http://www.toughdev.com/content/2011/02/vga-output-with-pic-microcontroller/

16F84A VGA Output
http://embedded-egypt.blogspot.com/2010/07/16f84a-vga-output.html

PIC 16F84 Microcontroller VGA interface
http://tinyvga.com/pic-vga

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