TDS-2012B NOT WORK - Page 1
Forum section: electronics / repair

author: tonhoj
author_rank: Newbie
timestamp: May 07, 2017, 02:07:27 pm
content: Hello everyone, I'm new here I live in Brazil and I need some helpMy TDS-2012B Oscilloscope Has Stopped Working...For some time it took a long time to show the image...Now turns on the screen illumination and shows nothingI tested the power supply looks okJ101 conecctorpowerpinsSeeI have doubt on pin 11, there is nothing on itCould someone give me a tip, I needed a complete schematic of this equipmentThank

author: Smith
author_rank: Frequent Contributor
timestamp: May 07, 2017, 04:39:44 pm
content: Pin 11 should be an 50Hz AC signal, which can be used as a trigger on your scope. Does the scope do anything else? Do leds come on, fan spin (if it has any), beeps, does any other sign of life? Maybe an USB / Ethernet connector to see if it communicates, to see if the microcontroller / FPGA is running?http://host.uniroma3.it/laboratori/escher/res/ESP_III/Data%20Sheet/Oscilloscopio%20TDS2012.pdfDo NOT expect schematics, they just want you to replace boards. Their block diagrams can be helpful though.

author: tonhoj
author_rank: Newbie
timestamp: May 07, 2017, 05:29:54 pm
content: Hello Smith, Thanks for answeringJust turn on the backlight. Dead, do not communicate with USB no LED lightsAs I said; Started taking time to show the image until it stopped altogetherP11 really is trigger ,okI made a Rework Soldering on the motherboardNo positive resultsI do not know which way to gothank

author: Smith
author_rank: Frequent Contributor
timestamp: May 08, 2017, 05:52:49 pm
content: Have you checked all voltage regulators onboard?As far as I can see on page 38 there should be multiple boards. Maybe reconnect the connectors, or disconnect a board and try again.

author: tonhoj
author_rank: Newbie
timestamp: May 09, 2017, 02:07:12 am
content: HI!!!The lack of an electronic scheme makes it difficult to repair the equipmentLook this I have doubtsthank

author: tautech
author_rank: Super Contributor
timestamp: May 09, 2017, 03:48:28 am
content: I can't offer much, my 2012B is broken too.There are a # of test points on the underside of the PCB, measure and post their values so that someone may compare them with their unit.Check all the PSU rail voltages make it to their respective destinations, check the PSU cable too, some of the rails are paralleled via multiple pins and conductors.Lastly, mine has one pin corroded through on U900, only spotted initially as tiny black dot but as the IC pin pitch is sooooo fine it's nigh on impossible to repair.

author: Smith
author_rank: Frequent Contributor
timestamp: May 09, 2017, 12:25:30 pm
content: If you have another scope to work with, you might want to check U801 (the one with the sticker) for activity. I guess it's the flash memory with the program in it, some parallel flash type. If it's empty/corrupt, you might be able to flash it. You can look for other memory too, like 24xx type memory. If voltages and hardware seem to be ok, software is the next guess.A basic programmer like a cheap TL866 should be enough to read/write the memory. Unless it's a NAND type, I don't think many programmers can read/write NAND. Maybe there is another way, like flashing by a USB stick or something? Maybe J800 is a JTAG port?One stupid idea, but just to be sure: Have you checked the battery?

author: tonhoj
author_rank: Newbie
timestamp: May 09, 2017, 11:52:09 pm
content: Thank TautechI'll try to make the measurement so I can compare!The lack of the electric scheme with Oscillogram makes it difficult to measureBad contact rust and bad solder not found...It all seems OKGood tips, SmithI'll get another oscilloscope to help with the repair.I have programmer and Jtag, but I believe that the problem is in hardware and not in software!Even so I'm going to do tests on the eproms!The battery, OKIn this topic was posted many information about this series of oscilloscope TektronixSeehttps://www.eevblog.com/forum/testgear/tektronix-tds1000b-series-hacks/I keep trying until I find something.I thank my friends for their help.

author: m3vuv
author_rank: Super Contributor
timestamp: January 04, 2022, 01:55:30 pm
content: Did you get anywhere with this?

author: tautech
author_rank: Super Contributor
timestamp: January 04, 2022, 08:19:39 pm
content: Quote from: m3vuv on January 04, 2022, 01:55:30 pmWork through the faultfinding section in the service manual.