Question about Jensen TS2050J 20" TV
I've lost the green color in my picture. I know very little but what I do know is that there are 3 "guns" that incorporate red, blue and green in order to give the TV color. I assume that whatever shoots the green, or the circuit board or power supply to the circuit board that shoots the green, needs to be replaced. I want to perform the work myself. How do I start?
If I may add to the posts of SparkGap and Poohawk
Have not worked on any Jensen models since they are not available in my region, but your problem seems to be typical in most CRT models either TV or monitors.
Most models/version would have 3 transistors for the color drive in the CRT PCB. In some cases, it would be a single power IC block. Assuming yours is the transistor variety, you simply have to replace 1 of the three. These transistors are easy to recognize since they are the largest in the CRT PCB and would often be attached to a heatsink. Alternately, it is also possible that you simply have a cold solder problem. Some would exhibit good passive test (forward/reverse bias test with an Ohmeter) but would fail when active. A sure test is to simply swap the red, green and blue power transistors around. The missing color would be a different color now other than green if indeed 1 of the 3 fails when powered. In some extreme cases it is the collector resistor (normally 1 watt) that also fails. Should you be able to identify/determine which of the 3, you can purchase a replacement transistor or play it safe and simply replace the 3. I would expect that the cost of the 3 transistors would be less than the CRT board and perhaps more easily replaceable.
Hope this be of further help to you. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Posted on Nov 11, 2007
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