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EEVblog 1515 - Dumpster Tektronix TDS540D 500MHz Oscilloscope LCD Replacement

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EEVblog:
Part 2 in the dumpster Tektronix 4CH 500MHz TDS540S oscilloscope.
Replacing the CRT with an LCD had a few issues...
Ebay listing here: https://www.ebay.com.au/itm/225251897379


darkspr1te:
When i saw the disruption in the initial image i knew it was the dot clock setting, iiyama monitors used to have that option burried in the menus and god forbid you change it to a setting incompatible with the vertical refresh your vga card is outputting right now as you would end up with a corrupted image or heavily overscanned image including the menu which relied in the incoming clock signal to match displayed timing , if you were lucky and had matrox or ati cards they would auto switch or you could change via a command line program which ment sometimes making a boot disc for dos with autoexec.bat running your command to switch vert freq of the vga signal.
ah the memories.

darkspr1te
 

TERRA Operative:
Nice bodge! :D

Question re. the HDD option in there, is there any software on that HDD by chance? I have some of the TDS software packages but I'm always on the lookout for more. :)

sean0118:
I still have Tektronix TDS754A parts available (in Sydney) which maybe be useful for this...    front panel knobs look the same at least...

https://www.eevblog.com/forum/buysellwanted/fs-tektronix-tds754a-parts-only-(sydney-aus)/msg4254691/#msg4254691

 :-+

bob808:
You should have checked the 12Vin circuit of the LCD board. It might have step up/down regulators on board which would be ok with 15Vin. Even a linear regulator wouldn't dissipate much extra heat with another 3V on top. The only issue would be the input caps if they're 16V rated, too close for comfort.

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