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| Tektronix TDS744 Color Display issue |
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| H1t3ck:
Hi, I just picked up a Tek TDS744 Scope from ebay and it has an issue with the color display. It has a bluish "tint" near the bottom of the display. It is always there. I believe the issue is related to the nucolor display since it is not present in the VGA output. See attached. Wondering if anyone else has had this or a similar problem? Anyone know where I can pick up a schematic for the TDS744? I have a TDS540 and had no problems finding a schematic, but have had no luck with the TDS744. Any help would be appreciated. TIA Tony |
| AVGresponding:
It'll be an issue with the LCD shutters. If you're really really lucky, reseating a few cables might fix it. Otherwise the best route seems to be to retrofit a VGA LCD screen. |
| nctnico:
That blue bar looks weird indeed. My guess would be a problem with the shutters or the CRT itself got burned in badly. The schematics found in the TDS540 component service manual will also apply to the TDS744 to a large extend. Or put differently: they helped me to work on these kind of oscilloscopes just fine. |
| H1t3ck:
--- Quote from: AVGresponding on February 22, 2023, 04:45:30 pm ---It'll be an issue with the LCD shutters. If you're really really lucky, reseating a few cables might fix it. Otherwise the best route seems to be to retrofit a VGA LCD screen. --- End quote --- Yes, agreed that is what I am thinking. i.e. hoping it's a connection issue in the LCD shutter assembly. I plan to take it apart when I get home tonight. Getting a color display with a single gun CRT display is pretty clever.. Looking forward to checking it out. Thanks! |
| H1t3ck:
--- Quote from: nctnico on February 22, 2023, 05:03:51 pm ---That blue bar looks weird indeed. My guess would be a problem with the shutters or the CRT itself got burned in badly. The schematics found in the TDS540 component service manual will also apply to the TDS744 to a large extend. Or put differently: they helped me to work on these kind of oscilloscopes just fine. --- End quote --- I don't believe it's a CRT burn issue given where it's located and the size of it, also, it would not be a normal area where you would have a constant beam exposure for a long time to cause a crt burn. The TDS540 is monochrome so no schematics for the color display section. Thanks! |
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