Here I repair a Commodore 128 Monitor (the 1902A) that I won on ebay. I was sold "for parts not working" and listed as initially working, but screen suddenly turned off and would not come back on. Initial testing showed a display but then after 10 seconds or so high voltage was lost and screen turned off. This is a trip through my repair process. I do not recommend repairing CRT's unless you first learn the basics of monitor repair. Discharge anode, power supply caps, and check ground points with ohm meter because chassis can be floating at very high voltages in some monitors. When monitor is on work with one hand, and it is recommended to use an isolation transformer for safety. Mistakes while repairing a CRT can be very painful or even deadly, but anyone can do it with some basic CRT repair knowledge. I've repaired about 8 or so monitors now with knowledge learned from reading TV old repair books (which are now difficult to find!).
