TEK TDS 744A No Display Repair Part 4 Front Panel Removed LCD Info

Description: This is a video of me taking measurements of the CRT front for the purpose of possibly installing a LCD Screen as my CRT assembly is not functioning.
Here are the CRT inset measurements.

- The LCD EXTERIOR dimensions need to be no larger than:
SAE: 1/2" X 6-5/8 (6.64)" X 5-1/4 (5.25)"
Metric: 127 mm X 168.65 mm X 133.35 mm
*** Note the depth can be deeper than 1/2" but you will have to make some offset brackets to compensate for the deeper depth.

- The ACTIVE/VEIWABLE AREA dimensions can be no larger than:
SAE: 4.4" down X 5-5/8" across. Diagonally: 7.2"
Metric: 111.76 mm X 143.4 mm. Diagonally: 182.88 mm.

- The Active area, for originality, MUST be a ratio of 4/3, here are some example ratio resolutions that should work if the screen is a 7" diagonal: 800x600: 1024x768 & 1280x960.

- To figure out if the Aspect ratio dimensions are 4/3, divide the large number by 4, then multiply the answer by 3. Then you will have the Horizontal x Vertical numbers you need. Ie. 1280/4 = 320, 320 x 3 = 960. So the screen you need is 1280x960 for a 4/3 aspect ratio. I don't know the resolution of the VGA out so I don't know if larger resolution screens will even make a difference in clarity.
- So until I do the experiment, or someone tells me, the 800 x 600 will have to do. I did notice when I worked the TDS3054 & 3054B scopes the LCD resolution was 800 x 600. So getting a higher resolution probably won't make any noticeable difference.

This is the best fit I've found so far. http://static1.1.sqspcdn.com/static/f/489821/26341797/1435253335283/CLAA070MA0ACW.pdf?token=45O9HeXfJvMwPVcfCDP0d6UKeog%3D Go to page 13/17 or page 14 in the PDF for the dimensions on this LCD.

Do a search on eBay for PN: CLAA070MA0ACW. With the Controller Board it’s under $60.00.

Here's a nice little search engine to find the exact LCD screen you want by: Brand, Part Number. Size, Resolution, Aspect Ratio, Brightness and Outline Dimensions. You can do a search here: http://www.beyondinfinite.com/lcd-panel.php On this screen first put in the Width & Height of the LCD you're looking for to obtain the listings. If you know the diagonal dimension you want just type it into the Search By Attributes block in the lower right of the screen. If you only want 7" screens just put 7 in both blocks.
When doing the search it corresponds to the view-able /active area. Then you can look up the data sheet to obtain the physical outer dimensions to see if it will fit the hole you want to put it in.

Before you go look for a 7.1 to 7.2" monitor I have found none anywhere. If you know of one please leave the P/N and link in the comments below.

For my TDS the closest I could find was the P/N and link I posted above. Also it should be noted that not all 7" monitors are of the same aspect ratio or resolution so you may want to take that into account. Also just because you find the right screen it doesn't mean you'll find a controller board that's in your price range. The alternative is to do some research and design an interface for your screen that can be pulled off the video chips on the A11 CPU/DRAM board. Doing it this way will require you to rewrite some of the code in the scope to allow it to provide a signal your interface circuit can use. If you want to go that route here's link to start you off https://forum.sparkfun.com/viewtopic.php?f=14&t=23147 So all I can recommend is unless you want to do all this, just buy a VGA Monitor unit already made that plugs into the VGA port on the back of the scope. Initially I was going to pull the connector off the back and reroute it internally to clean up the back. However later I opted against this idea so that if I wanted to hook up a larger display I wouldn't have to open up the scope and disconnect the internal display connection. So by leaving the connector on the back all I have to do is disconnect the internal and connect the external display instead. Yeah I know you then don't have the display on the front but what do you want for $60.00 dollars, you could go out and buy the $350.00 dollar version if you want, I'm not that picky and could use the extra money somewhere else. There is also another option to retain both screens, and that it is to buy a VGA splitter and internally mount it inside the now vacant CRT area. Most of these VGA splitters are run off 12-24 volts so just tap a source off the power supply and you're done. So unless you want to buy and mount an internal splitter, it's my recommendation that you leave the VGA port on the back and route your internal LCD monitor video plug to the outside of the scope on the back somewhere and just plug it in there.
I certainly hope all this research helps someone get out of dreaded dead CRT problem I'm in, but will soon be out of. I would still like to fix the internal CRT display someday but if this works and I'm sure it will, it's not high on my hit list.
Best Wishes & Blessings Keith

Видео TEK TDS 744A No Display Repair Part 4 Front Panel Removed LCD Info канала Keith Noneya