Repairing a $400 USD 6GHz oscilloscope - Tektronix TDS820

A $400 6GHz non-working Tektronix TDS820 oscilloscope was repaired and revived by replacing 2 EDO DRAM chips (one of them is faulty). The video shows the process of diagnosing and the way of pinning down the root cause. In addition, the video demonstrates the best practice of comparing component data sheets for seeking for similar spare DRAM chips (if no identical model) on eBay.
TDS5xx/6xx/7xx/8xx Debug Port to UART pinout mapping : drive.google.com/file/d/1kmw6...

[@izzzzzz6]

This is way above my level of diagnosis. Black Arts! Amazing!

[@phuang3]

You're good, man. Very impressive.

[@Dont_Gnaw_on_the_Kitty_1]

Used to us an 820 for semiconductor characterisation until we got merged. Head office used LeCroy wavemasters so we got one and the 820 sat on the shelf for years after that.

[@fichambawelby2632]

Incredible repair!. Thanks for sharing it with us. I have a (extremely small) problem (compared with yours) with a simple DS1486 RAMified watchdog timekeeper chip (of a Tek TDS784A), and silly me...I am not able to fix it. Seeing your video is an inspiration!.

[@wethepeople2749]

some oscilloscopes can be so expensive. It is worth learning how to fix one for very cheap.

[@denismilic1878]

very good video, only one minor advice adjust the music volume better and maybe change the tune.

[@ruhnet]

Fantastic repair!!!! Thanks for sharing it. Subscribed!

[@xConundrumx]

With this scope series (anything TDS really) first thing to check is the powersupply, it is a common point of failure.

[@AlejandroVargas-rl1uv]

What a nice video you made, im an electronic hobbyist from Venezuela my hitachi v-252 is not working correctly the line is a little bit bended

[@alcid3]

A new hope 😀

[@tiromancino_tt]

incredible but true

[@ElectricEvan]

Fantastic video. Thanks for sharing it. I have an 820. Is it possible to enable the FFT option through the serial debug port?

[@sreekanthmk86]

Awesome 😍😍😍

[@digitialoscilloscoperepair8834]

Thanks 🤗

[@manfredgotzinger1258]

I am impressed about the connection to the PC and the lot of opportunities!!! I have 2pc 820´, one is working, the 2nd not. Do you know where I can get an "advanced" service manual? Which program did you use on PC after connecting? Is there existing a documentation about this program?

[@digitialoscilloscoperepair8834]

The diagnostic program comes the scope, you just need make the debug board yourself.

[@rohitmiglani6560]

What is the type of debug uart module you have used and from where i can buy this external pcb connection for pc display??