Questions about TDS2022B - Page 1
Forum section: electronics / repair

author: bootboot
author_rank: Newbie
timestamp: November 25, 2018, 10:04:41 am
content: Hi,I have bought an old used TDS2022B, which can not boot up.When I push the power button on,it is dead with 3 LEDs light and nothing is displayed on the LCD.The COMP interface outputs 1V/5KHz wave when the 3 LED's light.I found it's motherboard is similar to TBS2012 when I disassembled it.Now,it puzzles me.I have the following questions:1 what type of the motherboard is it? TDS2022B or TBS2012?2 How can I bring it up?Please give me some advise about that.Thank you!

author: tautech
author_rank: Super Contributor
timestamp: November 25, 2018, 07:00:43 pm
content: Very similar to how my TDS2012B died.Same main board for 100 and 200 MHz models.....yes 100 can be hacked to 200 MHz.The service manual specifies one of the checks is the probe comp output and yes when its just 1V and 5KHz you have a problem !First, of course check the PSU.Second, carefully inspect the top side of the main PCB. Tek used an open top design for ventilation and contaminates can fall onto the PCB and over time corrode IC pins.....that's what happened to mine with one pin on U900 corroded through !So very very fine to repair...yes I've tried and as the chip is 100 pin and programmable I haven't replaced it yet.Last time I looked it was a $30 IC.

author: bootboot
author_rank: Newbie
timestamp: November 26, 2018, 01:16:02 am
content: Yes,TDS1000B/2000B have the same firmware,so upgrade is possible.But,I find my motherboard is same to TBS2012's board.TDS and TBS have the same board?

author: tautech
author_rank: Super Contributor
timestamp: November 26, 2018, 01:31:06 am
content: Quote from: bootboot on November 26, 2018, 01:16:02 amI don't think so, TBS are much later DSO's:TBS2000 Series Datasheethttps://www.tek.com/datasheet/digital-storage-oscilloscope

author: bootboot
author_rank: Newbie
timestamp: November 26, 2018, 01:57:24 am
content: I do not find my U900's pin have problemThere is no reset signal send to U900 so I think the FLASH chip may lost some info. I plan to check that first.

author: tautech
author_rank: Super Contributor
timestamp: November 26, 2018, 03:05:23 am
content: Quote from: bootboot on November 26, 2018, 01:57:24 amHere is another thread that if you post there some more members will see and maybe help:https://www.eevblog.com/forum/testgear/tds-1000-2000-3000-bw-hack/Don't forget to place a link back to this thread.

author: dzseki
author_rank: Frequent Contributor
timestamp: November 27, 2018, 07:59:55 am
content: We had the same problem at work, and it turned out with some keys pushed while powering on the scope (which I don't remember of course), can be brought back to life, at least we could...

author: Ordinaryman1971
author_rank: Frequent Contributor
timestamp: November 27, 2018, 08:31:56 pm
content: I've had one of those with the same problem and it was power supply. One of the capacitors right by the transformer in the middle of the board PSU was bad. Check caps please. Mine was easy to spot as it spilled its content. I may have a picture somewhere, if I find it I post it later on.

author: bootboot
author_rank: Newbie
timestamp: November 28, 2018, 03:18:52 am
content: I have checked the power connector(J101) of the board. All the voltages are similar to the data in TEK's service manual.I think PSU is ok.

author: bootboot
author_rank: Newbie
timestamp: November 28, 2018, 03:21:48 am
content: It's interesting. I will check all the buttons on the front panel.

author: vanbac
author_rank: Newbie
timestamp: February 02, 2020, 09:44:59 am
content: These are all files that are hopefully useful to you.

author: bootboot
author_rank: Newbie
timestamp: September 06, 2020, 07:52:32 am
content: Hi,vanbacThanks for your help!My TDS2022B is dead!