This shows you the differences between two versions of the page.
test_equipment:tds210_dead_backlight [2013/01/08 19:00] |
test_equipment:tds210_dead_backlight [2013/01/08 19:00] (current) |
||
---|---|---|---|
Line 1: | Line 1: | ||
+ | ====== TDS210 Dead Backlight ====== | ||
+ | |||
+ | > I just acquired a TDS224 4 Channel 100MHz DSO that other than the | ||
+ | > backlight being dead is otherwise perfect. | ||
+ | > | ||
+ | > Does anyone have any details about the dimensions of the CCFL tube | ||
+ | > used in these scopes before I tear into it? | ||
+ | > | ||
+ | > Also has anyone had any success opening the instrument without | ||
+ | > destroying the labels that you normally have to destroy? | ||
+ | > | ||
+ | > Deane any parts? | ||
+ | > | ||
+ | > Thanks to all, | ||
+ | > | ||
+ | > Sam | ||
+ | > W3OHM | ||
+ | |||
+ | |||
+ | The most common fault with dead backlights on TDS200 was/is not the tube but a shorted cap in the high voltage supply to the tube. | ||
+ | |||
+ | Often it also took other components with it. On the power supply board, check Q2, Q3 and C24 close to the AC input. | ||
+ | |||
+ | What labels would that be ? To open the scope use a screwdriver, with the handle folded down, insert it between the handle and cover and carefully twist it so the handle comes out of cover (on both sides). | ||
+ | |||
+ | When done unscrew the two torx screws that were behind the handle. | ||
+ | |||
+ | With the scope up side down pull the stand and the cover will come off. | ||
+ | |||
+ | /Håkan | ||