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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: Work without schematic posted by Shane on February 24, 2007 at 16:28:33:
The three transistors on the board one base of the tube are the color drivers. One each for the red, blue, and green CRT gun. They have nothing to do with scanning. Now if if you hade a picture but were missing just Green that would be a good place to start. But your problem lies in the deflection curcitry.CRT's larger than a few inches use magnetic deflection to scan the screen. So circuitry involving horizontal or virtical deflection would be on the main board not on the board plugged into the tube.
Again the follow the leads from the deflection yoke to the main board then follow the traces. Should lead you right to whatever output device(s) they are using.
Early 1990's you say... could eaisly be surface mounts. I remeber a certain few models of Sears TV's in that era had their virtical ouputs on a little board that stood up off the main board. They were a larger surface mount package (the size of a T0-220 with no tab or legs) and would get so hot the solder would flow off leaving just a white line as you have. The transistors were still good and could be resoldered.
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Follow Ups
- Re: Work without schematic - Tweekeng 17:16:02 02/24/07 (3)
- Re: Work without schematic - Shane 21:17:03 02/24/07 (2)
- the good old selenium rectifier days lol - Tweekeng 17:45:40 02/25/07 (1)
- Re: the good old selenium rectifier days lol - Shane 17:06:54 02/27/07 (0)
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