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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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