hybridfree/eevblog-posts huggingface dataset:
Tektronix TDS 694C - noise on input channels - Page 1
Forum section: electronics / repair

author: ragge
author_rank: Regular Contributor
timestamp: December 29, 2019, 11:03:27 pm
content: Hi all,I have a Tektronix TDS 694C with noisy input channels.The examples below are with nothing connected to the inputs.In 5 GS/s / 10ns/div mode, there is some 25 ns / 40 MHz cycles showing.In 10 GS/s mode, it shows as some 5 GHz noise.The input channel scaling does not seem to matter, the noise is pretty constant in amplitude on screen independent of voltage range.Has anyone else seen this?Could there be a problem with some power feed, or something?The triggering only works on channel 1 & 2 on this scope. I have not yet tried moving the trigger chips around. Could those have anything to do with it?Thanks for any hints, help and/or information!Also, any pointers to repair information for this scope, and/or firmware never than v6.4e, would be much appreciated!Best regards,Ragnar

author: nctnico
author_rank: Super Contributor
timestamp: December 29, 2019, 11:11:57 pm
content: Make sure to run the SPC first. This might clear the problem.

author: ragge
author_rank: Regular Contributor
timestamp: December 30, 2019, 05:02:45 am
content: Dear nctnico,You were entirely right, an SPC solved it!I had no idea that the signal could be this broken just because of bad self calibration.I am most grateful and embarrassed at the same time. :-)Best regards

author: madao
author_rank: Frequent Contributor
timestamp: December 30, 2019, 05:37:17 am
content: HelloCan you save firmware ? (i wanna play with TDS684C Aqcuisiiton board.)I can tell, Firmware from TDS500/700 is not useable in TDS600.TDS600 is CCD based DSO, it is really sensitive by deviation of SPC constant.regardsmatt

author: ragge
author_rank: Regular Contributor
timestamp: December 30, 2019, 05:47:08 am
content: Hi,The firmware for 694C actually says only "694C" in it, as opposed to e.g. the 5xx/7xx firmware that has a lot of models mentioned. I doubt it will work on a 684C.There is 684Bv4.3e athttp://www.ko4bb.com/getsimple/index.php?id=manuals&dir=Tektronix/Tektronix_-_TDS5xx_TDS6xx_TDS7xx_Digital_Phosphore_Oscilloscopes, not sure if that will work with a 684C though.Best regardsRagnar

author: KE5FX
author_rank: Super Contributor
timestamp: December 30, 2019, 06:33:19 am
content: Quote from: nctnico on December 29, 2019, 11:11:57 pmGood call there, I would never have guessed that was an SPC issue.

author: madao
author_rank: Frequent Contributor
timestamp: December 30, 2019, 07:04:35 am
content: Quote from: ragge on December 30, 2019, 05:47:08 am600B is too old. 600C is right. 694C or 684C, it doesn't play a role. Newer Firmware (since B-Serie) has acquisitionboard-autodetection. 644, 684, 694, it doesn't matter.thanksmatt
tektronix tds 724d Tv sync module error FIXED - Page 1
Forum section: electronics / repair

author: Rollin Hand
author_rank: Regular Contributor
timestamp: May 09, 2020, 05:56:26 pm
content: Hello board 671-2476-04 tv sync module is given the following error at start up:fail and then in the errors list:opt TV dont care codes Sw to n trig 2, no outputCheck caps are ok, voltages ok 5v,-5v,15v.also ok.I know no one uses a tv sync no more (analog Tv) but I like some help.ThanksRun clean error thru GPIB.Clean error list and now is ok.
Tektronix TDS 754D aqcuisition board fails (channel 1) - Page 1
Forum section: electronics / repair

author: okw
author_rank: Frequent Contributor
timestamp: September 08, 2023, 11:31:46 am
content: I get a "FAIL ++ Aqcuisition" at boot. I let the scope warm up, and tried to run the calibration. It fails. I've attached the error log.What could this point to?In the picture attached, I feel channel 1 with 10MHz, 400mVpp.Ch2/3/4 seems good (although it intermittently shows "histogram unstable", could be because I fed it with a low amplitude signal?).

author: TERRA Operative
author_rank: Super Contributor
timestamp: September 08, 2023, 03:21:44 pm
content: Looks like a faulty acquisition RAM problem. I had the same thing with my TDS794D.The periodic nature of the spikes, and that they are at the same level indicates that some RAM chips have stuck bits.I ended up removing the RAM chips one by one from the affected channel in my scope and testing them in my Retro Chip Tester Pro to find the issue. I found a number of bad chips that were replaced with chips harvested from another faulty acquisition board (pulled from a scope that was physically smashed).Just be aware that the RAM channels don't line up with the input jacks, they are in a different sequence. I can't remember the actual sequence though.I have a bunch of spare tested good RAM chips I can send cheap if you need them (Post an image of them so I can check if they match mine)

author: okw
author_rank: Frequent Contributor
timestamp: September 08, 2023, 04:59:51 pm
content: Thanks for your reply. Seems my CPU board has AS7C256-15JC and 6 of them, and the acquisition board has "71024 S12TY M9921M" and 32 of them (4 banks of.I guess it's the latter I need to replace. And only the ones associated with channel 1?

author: TERRA Operative
author_rank: Super Contributor
timestamp: September 08, 2023, 07:52:46 pm
content: Yep, that's correct, just the faulty RAM chips for channel 1 on the acquisition board.

author: Rax
author_rank: Super Contributor
timestamp: April 12, 2025, 11:22:05 pm
content: Resurrecting this old thread hoping for some findings to be shared.okw - how did you figure which channel's which on the acquisition board? Assuming you've been able to determine that.I've had (and still do) similar issues which I've been able to sort the most of, but mostly because the errors reported in the log pointed to specific failed SRAMs. Additionally, I found one that had an odd "low-resistance" condition between two address lines which was probably truncating the data.
Tektronix TDS 754D machine gunning - Page 1
Forum section: electronics / repair

author: okw
author_rank: Frequent Contributor
timestamp: September 05, 2023, 02:36:17 pm
content: Hi! I just acquired a Tektronix TDS 754D with a known faulty display (CRT). They tech salvage company I bought it from said it worked on external VGA. They probably just quickly tested it with a VGA and turned it off again.I powered it to warm it up at little while I was getting my external screen. Suddenly (3-4 minutes) I heard sparking machine gun sounds. Not quite that loud but still, like some piece of paper was caught in the fan, more more high pitched. I quickly turned it off. By then I felt the smell. Something was definitely happening electrically, like arcing or something. I opened it, found no brown spots, no bursted caps, etc.It's not too dirty, but some build up here and there with that fine gray dust powder, and some bigger bunnies here and there.Any ideas?Done a lot of live stuff, but I've never worked on CRTs, so I'm a bit worried.I'd be happy to disconnect and use external screen. Or remove the CRT all together, unless they are easy to fix?

author: TERRA Operative
author_rank: Super Contributor
timestamp: September 05, 2023, 03:38:57 pm
content: Disconnect the ribbon cable from the top PCB on the CRT side of the unit just in front of the fan above the disk drive.This will completely isolate power and signals to the CRT board and CRT (but not affect the VGA output).If you got a bad CRT, it can arc internally. I have a TDS600-something in my collection that was dropped by a previous owner, cracking the neck of the CRT from the shock, and it made similar zappy noises. Luckily I had a spare CRT, so the scope is all working happily again.

author: okw
author_rank: Frequent Contributor
timestamp: September 05, 2023, 04:47:32 pm
content: Thanks. Would it also be possible to disconnect the high voltage circuit too? Or is part of this also powering VGA?

author: TERRA Operative
author_rank: Super Contributor
timestamp: September 06, 2023, 05:52:49 am
content: Disconnecting the connector I described will totally isolate power to the CRT and CRT PCB, including all HV circuitry.

author: Jwalling
author_rank: Unknown
timestamp: September 06, 2023, 07:51:10 am
content: My money is on the flyback transformer. It's arcing to the sheet metal that the CPU board mounts on. I've seen this many times.

author: okw
author_rank: Frequent Contributor
timestamp: September 07, 2023, 05:49:08 pm
content: Which ones would that be? I'll probably see it when I plug it in :p

author: TERRA Operative
author_rank: Super Contributor
timestamp: September 08, 2023, 06:44:17 am
content: That's your main PSU board.The CRT board is to the left, the flyback transformer is the largeish black thing to the rear of the CRT board.
Tektronix TDS 784D Test points and schematics - Page 1
Forum section: electronics / repair

author: tektronixman
author_rank: Newbie
timestamp: April 05, 2023, 09:21:40 am
content: Has anybody got any info on what should appear on the many test points on a TDS 784D I have been searching for schematics for a while has anybody got a set or ever seen some.

author: alm
author_rank: Super Contributor
timestamp: April 05, 2023, 10:28:53 am
content: As very recently discussedhere, I don't think schematics have been released for anything more recent than theTDS 520Bwhich was likely released for a government / military contract.

author: TERRA Operative
author_rank: Super Contributor
timestamp: April 05, 2023, 10:49:02 am
content: I have a working TDS784D, if you need measurements, I can poke at some things and see what I get.
Tektronix TDS2004B TDS2XXX hack? - Page 1
Forum section: electronics / repair

author: CaptDon
author_rank: Super Contributor
timestamp: December 16, 2021, 02:26:46 pm
content: I have followed the other thread about the 1XXX, 2XXX, 3XXX series hacks. It mostly pertains to the 3000 series. One poster indicated to remove an EEPROM or FLASH device and reprogram it with his .py script. That is two hurdles for me, can't do the small pitch surface mount stuff at home and how do you run a .py script to program a device?? Seems like he would have supplied a binary or hex file and not a .py??? So my question is this, has anyone found a way to do the hack without opening the unit up? There are two USB ports, one front side and one back side. It would seem this hack could be done via USB? I do have a leveled sinewave generator (SG 503) which goes to 250Mhz so I sould be able to complete a calibration if my 2004B could be hacked to a 2024B. Many have said the upgrade to the 3000 series won't occur until a full calibration is run. Otherwise the scope ignores the upgrade attempt. TDS2024B was the highest operating level for the family of boards in my scope. Thanks for any binary or hex files and a simple way to flash my unit without SMD soldering.

author: tautech
author_rank: Super Contributor
timestamp: December 17, 2021, 08:13:53 am
content: Maybe you missed this post and another 2 posts later:https://www.eevblog.com/forum/testgear/tds-1000-2000-3000-bw-hack/msg1283087/#msg1283087https://www.eevblog.com/forum/testgear/tds-1000-2000-3000-bw-hack/msg1283607/#msg1283607

author: CaptDon
author_rank: Super Contributor
timestamp: December 17, 2021, 06:30:49 pm
content: The first link is the one pertaining mostly to the 3000 series, one guy mentioned he seems to have upgraded his 2014 to a 2024 but then wasn't sure it really changed the rise times, and two others reported no joy / didn't work. The second link does indicate success IF you unsolder the SMD and program it using a .py script and then do a full calibration (which I can do with a 250Mhz leved SG503 generator). Still means removing an SMD device and running a .py script. I have nothing running Python nor experience with it. However a .hex or .bin would be universal to all of the programmers I own and I could take the TDS2004B to my former workplace and do the SMD work there. Up until those threads died I don't think anyone has been able to enable the ENG MODE or flash the unit via the front or rear USB port which is my actual goal. It was mentioned that there seems to be kernels within the operating system that would allow flashing from a memory stick but it didn't go beyond that.
Tektronix TDS2014 + TDS2MEM = Black Screen? - Page 1
Forum section: electronics / repair

author: baakre
author_rank: Newbie
timestamp: January 23, 2018, 01:10:30 am
content: Hi,I'm trying to troubleshoot an issue with a Tektronix TDS2MEM expansion module and a TDS2014 oscilloscope. The scope firmware is v4.60. I don't know what firmware revision is on the TDS2MEM module, though it has a build date of 06/10/2004.Essentially, with the TDS2MEM installed, the scope will not power up. When I press the power button, the backlight of the screen comes on, but otherwise no activity or signs of life on the scope.If I remove the TDS2MEM module, the oscilloscope appears to work normal. I checked the diagnostic logs on the scope and there were no entries. The coin cell battery on the module measures 3V installed, so that isn't obviously dead.I've checked for bent or damage connector contacts and haven't been able to identify any. I did verify electrical connectivity on the outside facing row, but doing the same on the inner row will be a challenge without removing the logic board.Anyone have any suggestions for other things I could try or check before sending the module back? What is the purpose of the J102 2-pin header on the TDS2MEM module? I notice with a shunt jumper installed, the scope will illuminate the front panel LEDs but otherwise no change in behavior.Does anyone have a pinout of the expansion module connector?Thanks!

author: baakre
author_rank: Newbie
timestamp: January 30, 2018, 11:30:20 am
content: An update: Got it fixed. Turns out, there was a surface mount inductor pack (L901) that, at some point in this scope's history, was knocked off. After replacing this part, the scope powered up and recognized the TDS2MEM just fine.

author: Andre67
author_rank: Newbie
timestamp: July 27, 2020, 03:19:04 pm
content: I have the same problem. the L901 inductor is gone. does this inductor have any specifications?
Tektronix TDS3012 main board failure loading down the PS - Page 1
Forum section: electronics / repair

author: snoopy
author_rank: Frequent Contributor
timestamp: December 12, 2020, 02:20:07 pm
content: I was using my TDS3012 today when the screen when all white and then I turned it off and I cannot get it to power back on again !To cut a long story short the power supply is ok and I have gone through all of the troubleshooting guide in the S/M and it has led me to the main board being faulty.When you switch it on you see the fan momentarily move and sometimes a bit of light on the LCD screen but there is obviously something shorted out on the main board which is dragging the whole power supply down.Anyone fixed these at the board level ?cheersdavid
Tektronix TDS3012B CH 2 problem, help needed. - Page 1
Forum section: electronics / repair

author: Paceguy
author_rank: Regular Contributor
timestamp: September 25, 2021, 05:17:27 pm
content: I picked up a Tektronix TDS3012B a while back. Channel 1 works great, channel 2 has a trace but will not display a signal. This unit was used in an industrial environment, servicing machine tool machines and a robotic production line. There is a good chance that the input voltage limit on ch 2 was exceeded at some point leading to component failure on that channel. There is no sign of burned or destroyed components. Has anyone any idea which component(s) could have been effected. Thanks in advance!

author: madao
author_rank: Frequent Contributor
timestamp: September 26, 2021, 03:53:04 am
content: Ch2, show not in all range Signal ?I have a TDS3014, it doesn't show signal in 100-200-500mV Range and other range works with distortion.https://www.eevblog.com/forum/repair/tds3014-no-trace-no-reponse-of-frontplate/msg3035126/#msg3035126Hybride is dead, normally not fixable, you need Motherboard and very good solder skill.It is a TDS3012, not worth -> keep/sell for parts & repair of better TDS3000
Tektronix TDS3012B - Page 1
Forum section: electronics / repair

author: hitecelec
author_rank: Regular Contributor
timestamp: August 03, 2019, 12:24:54 pm
content: Hi AllThere is a problem with front panel rotary knobs both volts/div as well as time/divit is functioning randomly it doesnt go in sequence when rotated 10/5/2/1 after 1v/div instead of 500mv some times it switches back to 10VSimilarly the Time/div too behaves randomlyAny clues ?RegardsAnand

author: Jwalling
author_rank: Unknown
timestamp: August 03, 2019, 06:14:29 pm
content: Dirt or some other contamination under the encoders, most likely. You have to remove them and clean the PCB pads and encoder contacts.

author: hitecelec
author_rank: Regular Contributor
timestamp: August 07, 2019, 07:48:36 am
content: hello jayThanks for the inputs

author: hitecelec
author_rank: Regular Contributor
timestamp: August 16, 2019, 04:57:12 am
content: Hello jayif you cut open the 4 places where the rotary knobs are sealed. after cleaning the contact what type of epoxy or glue do you recommend to reseal the knobs

author: Jwalling
author_rank: Unknown
timestamp: August 16, 2019, 09:13:45 am
content: I use electronics grade RTV.

author: hitecelec
author_rank: Regular Contributor
timestamp: August 16, 2019, 02:16:42 pm
content: hello jaythanksAnand

author: Jwalling
author_rank: Unknown
timestamp: August 16, 2019, 05:58:50 pm
content: Quote from: hitecelec on August 16, 2019, 02:16:42 pmHiAnand,You're welcome. BTW, there's a "say thanks" button you can click on...

author: warrjon
author_rank: Newbie
timestamp: August 16, 2019, 10:09:56 pm
content: If cleaning the encoder does not work and you still have the issue RS Components has 12 step rotary encoders that you can replace the old ones with.

author: Jwalling
author_rank: Unknown
timestamp: August 17, 2019, 10:14:00 am
content: Quote from: warrjon on August 16, 2019, 10:09:56 pmI believe the encoders were custom made by Bourns for Tek. There's not much that can go wrong with them other than dirt or contamination. I've never seen the contacts on the encoder or the PCB wear out. If cleaning doesn't fix it, likely there's a electronics failure somewhere.
Tektronix TDS420 power supply repair - Page 1
Forum section: electronics / repair

author: elremont
author_rank: Newbie
timestamp: July 20, 2025, 02:31:38 pm
content: Hello everyoneI want to fix oscilloscope power supply PS-1690,It looks like one capacitor is missing,and between which legs should it be soldered and what uF?what voltage must be on the green hybrid?now I have on c7 capacitor (1 and 7 legs) 3.58v. its ok?all capacitors already replaced.

author: elremont
author_rank: Newbie
timestamp: July 22, 2025, 07:55:40 am
content: is this power supply supposed to work without an oscilloscope?Does it need a power on signal from an oscilloscope?

author: particleman
author_rank: Regular Contributor
timestamp: July 22, 2025, 03:56:45 pm
content: LOL I'm working on the same switcher right now. I replaced ever SMD cap on the thing few years back worked great. went to power it back on after years and nothing. Good luck hopefully someone with knowledge of this power supply chimes in.

author: particleman
author_rank: Regular Contributor
timestamp: July 22, 2025, 08:13:30 pm
content: I test my supply at the header and I'm missing +15V. -15V is good, -6.4V is good 5V is good. just no +15V
Tektronix TDS460A - Page 1
Forum section: electronics / repair

author: EddyInChicago
author_rank: Contributor
timestamp: August 28, 2020, 11:45:36 pm
content: Hi All,I'm a new here and hope someone can help me out with a problem I'm having with my TDS460A scope.When I power it on, all the LEDs come on the front panel and stay on. There is nothing on the CRT. Itseems locked or in some boot mode. Any advice on what I can do?NOTE: I have taken the scope apart (after this problem.....not before ever), and check for loose or brokenconnections. Also, checked for leaky caps. Thanks in advance.Ed

author: Testtech
author_rank: Regular Contributor
timestamp: August 29, 2020, 12:01:21 am
content: Check the two lithium batteries, I think if one or both are dead, it won't boot. And check the power supply voltages as well.

author: EddyInChicago
author_rank: Contributor
timestamp: August 29, 2020, 03:25:26 am
content: Here is a picture of two identical scopes I have. The one on the bottom is a good working scope. The one on top is the scope that will not boot correctly (at all).Notice the top board; it has an ".8" on the 7 segment LED. The one on the bottom has a "0". Any ideas?

author: madao
author_rank: Frequent Contributor
timestamp: August 29, 2020, 11:39:31 am
content: 8. on 7seg-display always? It look not good. Dead CPU Board... dead firmware: short life on 7-seg display.Then check reset-ciruit and clock. if all run fine- - it would be to much difficult to repairhttps://forum.tek.com/viewtopic.php?f=568&t=138100Try it at frist with debug port.Greetingsmatt

author: wn1fju
author_rank: Frequent Contributor
timestamp: August 29, 2020, 12:11:03 pm
content: For what it's worth, when I recapped my TDS520 scope, almost all of the SMT electrolytics on the display board showed signs of leakage (puddles, etc.) butnone of them on the processor board did. Yet all the caps were bad, measuring only a few nanofarads. I was also getting a hung boot condition with thediagnostic LED showing ".8" on mine. So take another look at the capacitors.

author: madao
author_rank: Frequent Contributor
timestamp: August 29, 2020, 12:41:25 pm
content: TDS400A (not old TDS400) haven't bad SMD eletrolytics . But possible: PSU with bad caps.Reason: TDS400A series is late modell (since 1996, issues with SMD capacitor is solved)
Tektronix TDS500-C/D Mono to TDS700-C/D Color Conversion - Page 1
Forum section: electronics / repair

author: strick
author_rank: Contributor
timestamp: November 08, 2023, 06:57:45 pm
content: Hi,I'm attempting to convert a couple of TDS540C CPU boards to color and use the standard Tektronix Nucolor display (the CRT with shutter and HV module). This threadhttps://www.eevblog.com/forum/repair/conversion-tektronix-tds500-to-tds700-color-oscilloscope/discusses adding the missing ram and changing a resistor, but assumes that one will use a 3rd party lcd display using the external VGA port.However, in one section, a user (PerpetualWalnut) did this same conversion (e.g. 540 to full 754), but only gives a few clues to some of the parts required. He shows the top and bottom of the board (enclosures 1 & 2), but fails to mention the resistor values on the bottom. Enclosure 3 shows the bottom of a TDS784D board that I bought, but someone had removed the two resistors in the bottom left (circled). The other resistors that are replaced (shown in enclosures 2 and 3) are all 1002 (10K).Could someone please take a look at their TDS754/784 C or D CPU board and inform let us know the values?thanks,Strick

author: strick
author_rank: Contributor
timestamp: November 08, 2023, 06:59:09 pm
content: The board only let me post one picture. here is the second.

author: strick
author_rank: Contributor
timestamp: November 08, 2023, 06:59:51 pm
content: and the Third, showing the two resistors removed...

author: Tantratron
author_rank: Frequent Contributor
timestamp: November 12, 2023, 11:39:18 am
content: Quote from: strick on November 08, 2023, 06:57:45 pmHi Strick, this is Albert from FranceAttached close view of one my TDS700D repaired, let me know if you need more info.First resistor 5230 and second resistor 75R0

author: strick
author_rank: Contributor
timestamp: November 12, 2023, 02:29:21 pm
content: Ah,thank you Albert!Strick
tektronix TDS500 TDS600 TDS700 color CRT shutter assembly - Page 1
Forum section: electronics / repair

author: Tantratron
author_rank: Frequent Contributor
timestamp: March 02, 2025, 03:43:25 pm
content: Hello, i've had acquired total of nine or ten TDSxxx (B&W and color CRT) and one day, the previous owner or company or repair center did a very strange thing on a TDS784D. I've bought it cheap, the PSU would not work then it took me eons to understand why the CPU board would fail its kernel booting. It finally worked, the acquisition board was fine but when i've open the unit for full cleaning, I've discovered what you see in the attached pictures. For some reason (good or bad), they knife cut part of black silicon or black glue from the color CRT.Do you think or know if it is worth to attempt any repair, if yes what is the glue or silicon model, is it easy to dot and how about the grounding metal plane supposed to isolate or connetc to the main chassis ?Otherwise due to the pictures, do you think it i sonly good to pursue the deconstruction like anatomy topic of the famous Nu-color patent invented by tektronix ?Note that the CRT works fine so the question is the mystery or knowledge on how to re-encapsulate all of it.
Tektronix TDS500 TDS600 TDS700 - Monochrome CRT driver repair - Page 1
Forum section: electronics / repair

author: Tantratron
author_rank: Frequent Contributor
timestamp: February 22, 2025, 11:13:03 am
content: Hello, since 2019 I've been acquiring, repairing and upgrading total of TDS500/700 (4 color and 5 monochrome).Most of the CRT's and electronic driver still work except two monochrome electronic driver boards.Since I've many sets of these B&W drivers, I've tried to quick and dirty test some continuity with my DMM of few components by comparing values between working unit versus failed unit.One failed unit comes from a TDS520, I've noticed the the variable inductor L167 to be open circuit instead of quasi short-circuit (38 ohms being the inductor resistance measured on working driver).Would you know any reason of a failure leading to actually open circuit of inductor internal wire to be cut for thsi L167 inductor (see RED arrow in attached picture) ?Since I've spare working monochrome driver and CRT, is it safe to replace or swap this L167 inductor or is there a risk the initial root cause to destruct again this inductor connected to the multiple winding transformer (see attached one schematics I've found on internet) ?Thank you in advance, Albert
Tektronix TDS5032B Diagnostic Failure - Page 1
Forum section: electronics / repair

author: trieck
author_rank: Newbie
timestamp: February 24, 2023, 03:50:22 pm
content: I purchased a Tektronix TDS5032B on eBay that was not working. I was able to repair it by re-capping the motherboard, replacing the power supply and replacing the memory. However, when theTekScope.exeapplication launches, I receive a diagnostic failure on one test. The test is calledLineTrigunder theHITL(Hardware In The Loop) area. The result of the test is code445.I haven't been able to find a lot of information about this error. From what I understand, the line trigger would typically be associated with a TV or video signal.Any help in tracking down information about this error or where I might begin to think about repairing this would be greatly appreciated.Thanks

author: voltsandjolts
author_rank: Unknown
timestamp: February 24, 2023, 04:45:12 pm
content: Power line trigger, like 50hz or 60hzMaybe related to changing psuWas there a loose wire pickup taped to the incoming live line

author: mikehank
author_rank: Regular Contributor
timestamp: February 24, 2023, 08:35:08 pm
content: Line trigger input comes directly from the power supply. It is the frequency of the input AC. 60 Hz for north America. Look at the power supply it looks like a common ATX supply but it has a couple of non-standard connectors. I would start there. I don't think I've seen the ACQ board cause line trigger failures.
Tektronix TDS5054-NV-AV - Button repair (broken shaft) - Page 1
Forum section: electronics / repair

author: newtekuser
author_rank: Frequent Contributor
timestamp: August 14, 2021, 05:12:50 pm
content: Hello All,The TDS5054 NV-AV scope I recently purchased off ebay came with a broken "LEVEL" button (broken shaft). The service manual for 5000 series does not list this individual part unfortunately.I am on the lookout for this part number, or if the price is right, purchase a replacement keypad (one that is 4 channel with touch screen option).The other alternative I thought was to remove the key pad, shave the remaining piece of the shaft to level it and 3D print a shaft made of ABS plastic of PLA and glue it to the base of the button/remaining shaft so I can add a button to it. This push button works though and can be turned in both directions if I use pliers, but it's not ideal.Does anyone have experience with this kind of button repair and can tell me if what I thought above would work?Thanks!

author: Jwalling
author_rank: Unknown
timestamp: August 15, 2021, 09:25:22 am
content: Part is a Bourns EPS1D-F19-AE0024LMouser stocks them:https://www.mouser.com/ProductDetail/Bourns/EPS1D-F19-AE0024L?qs=%2Fha2pyFadugTxv9ivcBZMaYJNdZ7J7S6D26VmTJboabg8s6%2FadWinA%3D%3D

author: newtekuser
author_rank: Frequent Contributor
timestamp: August 15, 2021, 03:48:57 pm
content: You are a life (and time) saver my friend
(SOLVED) Tektronix TDS5054B, Acquisition board - info/help needed. - Page 1
Forum section: electronics / repair

author: acheaile
author_rank: Newbie
timestamp: November 21, 2021, 04:38:30 pm
content: Hello everyone, just subscribed and first post here on EEVb. I did know this very useful and informative site since some time now. And today, well i need help about a Tek scope...Mine need the probe comp. port to be fixed. I already traced the problem to be at the output on the acquisition board. I replaced some output transistors and resistors on the front side of the acquisition board already. But there is other parts (resistors) that certainly need to be changed on the backside of the board.My problem is : i cannot identify the value of the resistors that has overheated/burnt on the backside of my board. If another owner of this scope could take the time to look at the parts in question, or just take some enough high resolution pictures, or even better if someone has the schematic of the board, and share it to me, i would really appreciate it! Many thanks in advance for any of your help!Attached pictures are the area of the board in question....

author: Jwalling
author_rank: Unknown
timestamp: November 22, 2021, 10:56:12 am
content: This picture is from a TDS5054 (non B)Perhaps this will help. Can't see why they'd change this area of the board on a B model.

author: OH2LIY
author_rank: Contributor
timestamp: November 22, 2021, 02:02:05 pm
content: Hi, anyone studied how to change TDS5054 -> 5104? Is there similar four resistors what is used in TDS6/7** series?Ramppa

author: shuvodutta
author_rank: Contributor
timestamp: November 22, 2021, 04:42:51 pm
content: @OH2LIYHave a look at the end of this discussion thread,https://www.eevblog.com/forum/repair/tekscope-tds5000b-don_t-want-to-reinstall-on-fresh-os/It's reg. TDS5054B but the Analog Front End is probably same for both TDS5054 & TDS5054B.

author: acheaile
author_rank: Newbie
timestamp: November 22, 2021, 10:43:55 pm
content: Thank you Jwalling! Yes that section of the board look very similar on the non B version!I can't really see the markings on the resistors (R1624, R1610, R1611, R1612, R1615, R1614) because the lighting seems to have make them look blurry.Can you please give it a second chance and take another picture, or take note of the markings on those resistors and report it to me...?Thanks!!

author: Jwalling
author_rank: Unknown
timestamp: November 23, 2021, 10:43:19 am
content: Quote from: acheaile on November 22, 2021, 10:43:55 pmIt's not the light so much as my crappy phone. I have a 14MP Nikon, but it won't focus closer than about a foot or so...Here's a picture with the markings; HTH.

author: acheaile
author_rank: Newbie
timestamp: November 24, 2021, 09:59:57 pm
content: Awesome! Pretty confident that's all that it needs to bring back the scope to a 100% functional state.Again, Thanks a lot Jwalling! I could not have expected anything better!---This Topic is solved---
Tektronix TDS5054B hard drive problems  - Page 1
Forum section: electronics / repair

author: redacted9041
author_rank: Newbie
timestamp: May 27, 2023, 02:49:09 am
content: i got a Tektronix TDS5054B free from a bin and it is fine except for the hard drive having boot issues i do know there is a Sata port on it just wording if there is any way to get that to use that over a hard drive. thank you for any help

author: Kosmic
author_rank: Super Contributor
timestamp: May 27, 2023, 02:56:58 am
content: Yes you can use an adapter to install a sata drive. I used this onehttps://www.amazon.ca/gp/product/B07QN9STY7/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1and 3dprinted a standoff to hold the drive correctly. The original metal plate need to be modified a little bit too since the drive is longer with the adapter.Sorry I don't think I have any pictures.
Tektronix TDS5054b-NV Wont Post - Page 1
Forum section: electronics / repair

author: Fixed_Until_Broken
author_rank: Regular Contributor
timestamp: May 27, 2021, 11:14:24 pm
content: The other day I got a hand me down Tektronix TDS5054b-NV that seems to be brain dead.It doesn't post at all. I diagnosed it to have a bad power supply. the PSU only gave 11v on the 12v rail and the -12 rail was only -9. Replaced the PSU and now the rails are good but still no post.I am trying to diagnose if its the mother board or the powerPC PCI board that is the issue. I know the motherboard is an off the shelf intel board but does it have a custom BIOS that turns the VGA port off on it? I tried to pulling the motherboard out and just hooking it up to a monitor and I get nothing on the vga out. If I take the ram off the MOBO and try to boot it does start beeping. I get fan spin either way. Does anyone know if it has a some custom BIOS that doesn't do a normal post screen or something?Anyone ever run into something like this before what was wrong with yours? I can post photos if needed but I can't think of any useful photos to post. I would really like to get this thing working It would be an upgrade from my HP 54600B

author: Jwalling
author_rank: Unknown
timestamp: May 28, 2021, 08:48:58 am
content: With the MB out of the scope, it should POST normally with VGA out. Any bulging caps?

author: Fixed_Until_Broken
author_rank: Regular Contributor
timestamp: May 28, 2021, 05:10:01 pm
content: found the issue. The original power supply was the original issue. When I took the whole thing apart I took the ram out to clean out the years of dust. I managed to put it back in wrong slot causing the no post with the new PSU. once I swapped it back the scope is working now!Now to add some extra ram. one of my buddies is sending me some.So with the corsair power supply does that now make it a gaming oscilloscope?
Tektronix TDS5104b recovery disk - Page 1
Forum section: electronics / repair

author: gabornemeth2013
author_rank: Newbie
timestamp: September 25, 2025, 11:41:46 am
content: Hello there!I have a tektronix TDS5104b oscilloscope, with B06xxxx serial number (last model, no floppy disk, 512 Mb RAM and intel celeron cpu). Lately I have gotten some windows unknown hard errors. So the natural thing to do is to run sfc /scannow, but it asks for a windows 2000 sp4 disk, to copy over some dlls. Would I need the original tektronix OS recovery disk to copy these files? I am afraid if I just download and burn any windows 2k disk, I will overwrite some dll I cannot replace. Does someone have experience with this? Or maybe, does someone have the disk for this model?Thank you very much in advance!Cheers;-G

author: Phaseseeker
author_rank: Regular Contributor
timestamp: September 25, 2025, 12:35:54 pm
content: The sfc utility should only check the integrity of the system files that belong to Windows itself, and I doubt Tektronix would mess with those, so it SHOULD be safe. Still, it would be a good idea to image your drive prior to trying anything else, at the very least so that you have some backups if you need them i the future.Also, check if somebody copied the contents of the CD on the hard drive; considering how often old Windows prompts you for the CD, it's not uncommon to do that.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 25, 2025, 12:57:00 pm
content: use windows scandisk 1st your hdd may have began to fail / bad tracks or else do backups, mostly any tek ... drivers ... or other named folders on C:\
tektronix TDS540C cursor partial failure - Page 1
Forum section: electronics / repair

author: Tantratron
author_rank: Frequent Contributor
timestamp: December 01, 2019, 05:39:11 am
content: Hello, I've purchased this week on eBay a TDS540C which seems to work OK, pass the start self-test and SPC test.However there is one failure I notice with cursor management: the H-bar work OK but the V-bar are not working properly.The V-bar will never appear on the screen upon selection plus the display of its values (DELTA and ABSOLUTE) seems to be multiplied by 100x when comparing on the Horizontal scale time division.If choosing the InstaVu then both V-bars appear on the screen and shows correct values.Same failure under paired cursor who never show up on the display but will appear if choosing InstaVu mode.Thank you, Albert

author: Alfons
author_rank: Regular Contributor
timestamp: December 01, 2019, 05:16:41 pm
content: Set OK in the utility menu "Tek Secure Erase Memory". Maybe it helps.

author: Tantratron
author_rank: Frequent Contributor
timestamp: December 01, 2019, 06:22:36 pm
content: Hello Alfons,Your suggestion has worked, now vertical bar cursors and display works fine wether normal view or InstantVuHowever this "Tek Secure Erase Memory" has considerably reduced the brightness of the display which I can hardly see now. Do you know of an easy and quick method to increase the brightness of the screen ?Thank you, Albert

author: Alfons
author_rank: Regular Contributor
timestamp: December 01, 2019, 06:35:40 pm
content: In the display menu you will find everything you need. Since you can adjust the overall brightness or each color. OK, you have black and white? But no matter, in the display menu, you can set everything. But do not be fooled: it is often more pleasant to work with less brightness. Protects the eyes.
Tektronix TDS540C GPIB issue when write protect disabled - Page 1
Forum section: electronics / repair

author: jhov
author_rank: Newbie
timestamp: October 21, 2022, 06:47:41 pm
content: I recently acquired a TDS540C and was going through the process of making backups of the NVRAM and FW and enabling options and ran into an issue I haven't seen before when trying to communicate with it via GPIB. I'm able to read the NVRAM and firmware using the unified tektool and when the write protect switch is on the GPIB interface works normally; but when the write protect switch is off the GPIB address is found at 29 and the instrument no longer responds to commands using PyVISA or NI MAX / NI Interactive Control. I have the address set to 1 and I've tried sending commands to 1 and 29 and neither work. I've also tried setting the 540C to address 29 and it still will not respond when the write protect switch is off.Possibly related, before I realized the issue, I sent "PASSWORD PITBULL" and "WORDCONSTANT:ATPUT 327689, 1" to enable FFT. Without thinking I also sent "WORDCONSTANT:ATPUT 0x50006, 1", forgetting to convert it to decimal first. I haven't been able to find any documentation on these commands so I'm not sure if that just resulted in an error or if it wrote that value to address 50006 or something.After realizing my error, I checked the error log and saw:I'm running NI 488.2 v17.6 and NI VISA 18. I've done the same process without issue on my TDS540B so I'm at a loss here. Any ideas what could be the issue?

author: jhov
author_rank: Newbie
timestamp: October 21, 2022, 09:49:41 pm
content: It's been a while since I've done this, but as I recall, the procedure I always followed was to boot it with the write protect switch off, but I just tried booting it with it on then turning it off after it was running and I was able to write settings to it as needed. Maybe my memory is failing me, but either way I was able to make back ups and enable options. It's still interesting that the unified tektool was able to read the memory when booted with the protection switch off, while nothing else could read or write to it in that state.
Tektronix TDS644A no video on screen or VGA - Page 1
Forum section: electronics / repair

author: hansgt21
author_rank: Newbie
timestamp: May 15, 2025, 11:28:15 pm
content: Hi,I would like to share my repair experience with a recently acquired TDS644A that - among other problems with the acquisition board - did not display any video on the screen or VGA output.After replacing all electrolytic caps on A10 and A11 ( the usual first step ) I checked the video portion of the processor board A11.Result : a constant "Blank" signal was preventing the video output.Unfortunately the A11 board has a few highly integrated custom ICs which - if defective - would mean the end of the repair job.I traced the origin of the "Blank" signal to U2100 and inspected the pins and surroundings without any visual result.Next step was heating the chip slightly while booting up which resulted in a distorted picture on the screen and video monitor.Booting without heating and subsequent heating did not revive the picture on the screen.There was one specific corner of the chip, closest an electrolytic, that seemed do do the trick.So, the chip was working and there had to be a contact issue.Visual inspection did not reveal any open traces ( see attachment ).Measuring the connections between the pins of U2100 and closest vias revealed an open between pin 3 and it's via.After carefully exposing the copper trace, putting on a trace of flux and using the finest solder tip the connection and video signal was restored.Next step : repairing the acquisition board...Best regardsHansPS : I would like to take the opportunity to thank madao ( Matt ) for his valuable support during previous repairs !
Tektronix TDS654c noise with higher sampling rates - Page 1
Forum section: electronics / repair

author: gabornemeth2013
author_rank: Newbie
timestamp: April 12, 2024, 07:32:51 pm
content: Greetings.I have recently acquired a tektronix TDS654c oscilloscope, where I have found that everything works fine, with sampling rates under 25Msps, but once I go up to 25M, there is a periodic noise appearing on the signal, regardless of being in AC/DC/GND coupling, which looks to be around 250Khz. I have found online that this could be caused by a bad cap, so then I went ahead and replaced all the electrolitic caps in the PSU, which unfortunately didn’t solve the issue. I believe that this still could be a PSU issue (periodic noise suggests that), and hopefully not with the acquisition board. So this is where I’m stuck however, maybe a forum member has seen this issue, or could someone point to the right direction? Any help would be appreciated.I have attached a photo of 10 and 25 Msps acquisition.Thank you,G

author: sicco
author_rank: Regular Contributor
timestamp: April 13, 2024, 01:39:31 pm
content: Does this model have SPC (signal path compensation) as an option under Util/Calibrate menu? If yes then see if that passes ok. Quite likely that after a pass your ‘noise’ will be gone. The noise then was systematic errors, scale or offset, in the many elements in the array of sample/hold elements in the ADC chips.

author: gabornemeth2013
author_rank: Newbie
timestamp: April 16, 2024, 04:39:47 pm
content: Hi!That did solve my issue, I could try it yestersay! I didn't even know about this feature, thank you for helping me!
Tektronix TDS7054 HDD/SDD image - Page 1
Forum section: electronics / repair

author: Electrole
author_rank: Contributor
timestamp: January 24, 2021, 08:16:42 pm
content: The HDD in my Tektronix TDS7054 has gone into permanent disorder and the scope now refuses to boot or to even recognize the HDD.Of course this took place before I got around to make a clone and move everything to a new SDDDoes anybody have an image of a HDD or a SDD of a TDS7054 that they would be willing to share somehow???My TDS7054 has the 2M option, if that makes any difference.BR Ole
Tektronix TDS7104 Hard Drive Info - Page 1
Forum section: electronics / repair

author: Johnny10
author_rank: Frequent Contributor
timestamp: December 08, 2017, 01:15:55 pm
content: I am trying to bring my surplus Tek TDS7104 back to life.It is missing Hard drive and front buttons for a start.Probably other problems if it was used as parts mule.Shows on post Intel BL440ZXIntel Celeron 500Mhz128MB RamWin 98 SE EmbeddedDoes anyone have info on hard drive and access to software?And what might largest system memory be?I have been reading through previous posts.

author: oventech
author_rank: Contributor
timestamp: December 09, 2017, 02:41:01 am
content: Found this for the manual on the scope.https://www.tek.com/oscilloscope/tds7054-manual/tds7104-and-tds7054-instructions

author: Johnny10
author_rank: Frequent Contributor
timestamp: December 11, 2017, 04:16:10 pm
content: And now I just need lots of knobs !And a Hard Drive Caddy.I ordered the 16GB SSDAnd 512MB of Memory. 2-256MB sticksMerry Christmas!Thanks TIN

author: Johnny10
author_rank: Frequent Contributor
timestamp: December 14, 2017, 02:48:23 am
content: Is this part available?Tektronix Cabinet Assy: Removable Hard Disk Drive Holder 437-0494-00This is HD Caddy Connector.I do not know the name of this connector.

author: Johnny10
author_rank: Frequent Contributor
timestamp: December 15, 2017, 03:56:04 pm
content: Another view

author: matthuszagh
author_rank: Frequent Contributor
timestamp: December 01, 2020, 05:28:50 am
content: I know this is several years late, but if you need it I have the windows disk image (i.e., the windows 2000 installation with all associated software).

author: Johnny10
author_rank: Frequent Contributor
timestamp: December 01, 2020, 01:18:56 pm
content: Is this for the Intel BL440ZX motherboard?

author: matthuszagh
author_rank: Frequent Contributor
timestamp: December 02, 2020, 12:33:28 am
content: I'm not sure. Does this come with different motherboards? It's just the contents of the HDD.
Tektronix TDS7104 Making SPC Calibration stick? - Page 1
Forum section: electronics / repair

author: CaptDon
author_rank: Super Contributor
timestamp: April 29, 2020, 07:14:32 pm
content: We have a well kept TDS7104 here at work. It is in excellent condition buthas one small problem. At startup there is an annoying amount of D.C.offset in channel 3. The offset is stable and unchanging even after completewarm-up. Simply running Signal Path Calibration removes the offset but theunit does not seem to store the correction factor. If you exit the cal menu anddo a normal power down, the offset will be there again even if you restart thescope immediately while it is 'still warmed up' so to speak. Is there some secrethandshake to get this thing to store the offset value?? Thanks!!