Repair Siglent SDS1102DL - Page 1
Forum section: electronics / repair

author: Bigfoot
author_rank: Contributor
timestamp: July 26, 2015, 11:04:04 pm
content: Hello Folks,I dabble in electronics and purchased a Siglent SDS1102DL DSO over a year ago and now out of waranty. I've used it half a dozen times and it's been sitting on the bench for at least 6 months unused. Anyhow I turned it on yesterday to use it and it booted up with the LCD screen reversed left to right ,flickering and snowy. The buttons all work and it shows traces but everything is reversed such as text labels and menus. The menu even shows up on the left instead of the right of the screen. I stripped it down to check the ribbon cables but found nothing wrong.Would any of you kind folk have a clue? I will try a firmware upgrage before I drop kick it into the dumpster.Cheers,Bigfoot.

author: tec5c
author_rank: Frequent Contributor
timestamp: July 27, 2015, 04:16:36 am
content: Quote from: Bigfoot on July 26, 2015, 11:04:04 pmHowever, DON'T DO THAT!!For something that has received such little use tends to make me think that it could just need a firmware upgrade. Also, there are Siglent aficionado's (distributors) present on this forum so I am sure they will chime in and offer you some sound advice.Edit: The Siglent distributor for NZ who is active on this forum goes by the name 'tautech'. So if you don't have any luck, shoot him a PM and see if he has come across this problem before.

author: pickle9000
author_rank: Super Contributor
timestamp: July 27, 2015, 04:40:45 am
content: If I remember right the firmware is in two parts (or was way back when) and that is to support the resellers (sold under many brandnames and that allows for branding). Sounds like that part the bit with the splash screen and font information is having the issue. When you upload the firmware you will need to make sure that both portions are installed. By default I don't think that they are, only the functions relating directly to the controls and such, not the font and layout.

author: tautech
author_rank: Super Contributor
timestamp: July 27, 2015, 06:01:27 am
content: Quote from: Bigfoot on July 26, 2015, 11:04:04 pmNo it's not, Siglent products have 3 years warranty.Honestly your first contact should be your supplier or contact Siglent for your local distributor.Post a photo please.Quote from: pickle9000 on July 27, 2015, 04:40:45 amIt doesn't sound like the .cfg file is the problem.

author: Siglent
author_rank: Regular Contributor
timestamp: July 27, 2015, 08:22:11 am
content: Quote from: Bigfoot on July 26, 2015, 11:04:04 pmYou must met a display problem, If you could remove the shell refer to the service manualhttp://siglentamerica.com/Uploadfile/file/20140925/SDS1000DL_ServiceManual_en.pdf, I suggest you to check the cable between the display and mother board.

author: tec5c
author_rank: Frequent Contributor
timestamp: July 27, 2015, 11:05:50 am
content: Quote from: Siglent on July 27, 2015, 08:22:11 amWould a loose cable really result in the text being reversed though?

author: Bigfoot
author_rank: Contributor
timestamp: July 27, 2015, 11:33:33 pm
content: I've updated firmware and reseated both ends of the flexcables with no change in the problem. See the attached pic. Everything is reversed from the very first boot screen through operation. Also I think the screen looks washed out , too much noise as I would expect the signal view area to be nice and black.Sometimes when pushing buttons red and green bars appear vertically and the screen refresh slows down and flickers.the image looks distorted at the right hand side (is that overscanning?) So with my limited knowledge it looks like the video signal is out of whack.

author: Bigfoot
author_rank: Contributor
timestamp: July 27, 2015, 11:34:40 pm
content: Another pic of the screen with help menu up.

author: tautech
author_rank: Super Contributor
timestamp: July 28, 2015, 12:02:32 am
content: Never seen anything like it.....Siglent's placed a link to the SM, could you do the PSU and motherboard checks?Good DMM and scope required for 3 frequency checks on crystals.

author: Bigfoot
author_rank: Contributor
timestamp: July 28, 2015, 12:24:42 am
content: Yes truly bizarre. Fortunately I have a couple of analog scopes and frequency counter. I'll locate the SM ans see about the PS.Bigfoot.

author: tec5c
author_rank: Frequent Contributor
timestamp: July 28, 2015, 12:35:13 am
content: Quote from: tautech on July 27, 2015, 06:01:27 amEven so, the OP mentioned in his first post that the unit had been openedQuote from: Bigfoot on July 28, 2015, 12:24:42 amQuote from: Siglent on July 27, 2015, 08:22:11 am

author: Bigfoot
author_rank: Contributor
timestamp: July 28, 2015, 03:09:25 am
content: Looking at the service manual it indicates that this kind of failure requires the unit be returned to the service center. At this stage I can't remember who it was purchased from but in any event warranty has been voided.

author: tautech
author_rank: Super Contributor
timestamp: July 28, 2015, 03:11:32 am
content: Quote from: tec5c on July 28, 2015, 12:35:13 amYes and despite this Siglent Technical support have asked the OP to:Quote from: Siglent on July 27, 2015, 08:22:11 amSiglent recognize EEVblog members are not fools and are capable of simple checks.Test procedures are quite straight forward and well described in the Service manual that is free for all to download.

author: miguelvp
author_rank: Super Contributor
timestamp: July 28, 2015, 04:17:09 am
content: Seems to me the Australia detection chip malfunctioned and instead of flipping the image over the horizontal axes it's flipping it over the vertical one.Kidding aside, Siglent are the ones that asked you to open the scope to look at the cable, I would think they will still honor your 3 year warranty as tautech has mentioned.

author: Bigfoot
author_rank: Contributor
timestamp: July 28, 2015, 07:06:42 am
content: I've performed the checks. All voltages on the power connector are within spec. The 3 frequencies measured spot on , 30MHz, 25MHz and 100MHz.

author: tautech
author_rank: Super Contributor
timestamp: July 28, 2015, 07:59:12 am
content: Quote from: Bigfoot on July 28, 2015, 07:06:42 amI've asked Siglent to re-visit this thread, let's see what advice they offer for your next step.

author: Bigfoot
author_rank: Contributor
timestamp: July 28, 2015, 08:35:20 am
content: OK Thanks very much.

author: Siglent
author_rank: Regular Contributor
timestamp: July 29, 2015, 03:05:29 am
content: Hi Bigfoot,please reinsert the cable between the display and mother board.

author: tec5c
author_rank: Frequent Contributor
timestamp: July 29, 2015, 07:50:03 am
content: Quote from: Bigfoot on July 27, 2015, 11:33:33 pmQuote from: Siglent on July 29, 2015, 03:05:29 amHmm.

author: tautech
author_rank: Super Contributor
timestamp: July 29, 2015, 08:00:07 am
content: Quote from: tec5c on July 29, 2015, 07:50:03 amThis is not to say Bigfoot has done this correctly.These ribbon cables can be tricky to engage correctly and get all the way home and then get the retainer locked as well.When I had a incorrect display problem with a similar unit under warranty Siglent sent a spare display ribbon cable along with other replacement parts.However it was been the only warranty repair I have had to do on Siglent products.Touch wood.

author: Bigfoot
author_rank: Contributor
timestamp: July 29, 2015, 09:58:49 am
content: OK. I'll give it another try. I did clean the contacts with isopropyl alcohol and I understand these ribbon cables can be problematic. We'll see what happens.

author: Bigfoot
author_rank: Contributor
timestamp: July 29, 2015, 11:25:48 pm
content: I've removed and reseated both ribbon cables , also inspected for cold joints on the mainboard cable socket with a magnifier and can't see anything wrong. The LCD mylar flexcable has factory goop all over the end so reluctant to touch that. I've also removed the LCD ribbon cable and checked continuity on each individual line and it also checks out OK.It still remains a mysterious problem.

author: Bigfoot
author_rank: Contributor
timestamp: July 30, 2015, 12:29:17 am
content: Murphy's rides again!I plucked the silicon off the LCD Mylar flexcable that goes directly to the LCD and reseated the cable, booted up the scope and the display is now back to normal see the pic. There you have it the cable socket is a hinged type that lifts off the cable as I discovered under the silicon adhesive so any contraction of the silicon over time is going to reduce conductivity of the cable to socket as it would have a tendancy to unlock the cable.Alas I now need a replacement power switch as I inadvertently snapped it off at the mast. It didn't require much force to do this. The switch cap needs to be the first thing removed. Live and learn.

author: tautech
author_rank: Super Contributor
timestamp: July 30, 2015, 04:35:11 am
content: Quote from: Bigfoot on July 30, 2015, 12:29:17 amNot sure what silicon you mean.There usually is a fabric retaining tape to prevent accidental dislodgement for these ribbon cables.IME it lifts cleanly and is placed above the tinned and exposed area of the cable and adheres to the socket. Lifting it can be a little tricky, I use a tiny screwdriver or the blunt side of a scalpel blade.Anyways, you have it going.Pic of new factory supplied display ribbon cable as below.~75mm long.

author: pickle9000
author_rank: Super Contributor
timestamp: July 30, 2015, 04:46:28 am
content: I have to say that a simple thread like this says a great deal about Siglent and tautech. I would have suggest to Siglent that they post a disclaimer (do at your own risk) but regardless, two thumbs up on the just do it attitude.

author: Bigfoot
author_rank: Contributor
timestamp: July 30, 2015, 06:16:25 am
content: The silicon I'm referring to is on the small PCB stuck to the back of the LCD panel which has two connectors one is the end of the ribbon cable coming from the main PCB and the other is a socket for the Mylar (clear orange) flexcable which goes into the TFT display itself. This small PCB looks to be a bridge between the grey ribbon cable and the orange Mylar flexcable. The problem had nothing to do with the grey ribbon cables.There's no tape on any of my cables. There appears to be copious amounts of white (neutral core) silicon used. Quite a bit of it around the legs of a group of electrolytics on the Power Supply board (probably for HV insulation). I know this stuff shrinks with age and realistically I can see why this would cause a problem on the specific socket due to the construction. Once you pick off the silicon the socket latch comes away at 90deg to the cable, it's the hinged variety. I didn't get a pic of this as the scope is all sealed up now.There's a possibility this will occur with other units. Very strange how the display was reversed though.Anyhow I thank you all for the suggestions.Bigfoot.

author: tautech
author_rank: Super Contributor
timestamp: July 30, 2015, 07:18:25 am
content: Quote from: Bigfoot on July 30, 2015, 06:16:25 amGotcha. Thanks for the explanation.QuoteIn many Asian products you find this.More for mechanical reasons than electrical IMHO.

author: tautech
author_rank: Super Contributor
timestamp: July 30, 2015, 07:54:47 am
content: Quote from: pickle9000 on July 30, 2015, 04:46:28 amIt's more than that pickle, don't you just love a good mystery too.@ BigfootThis was a very unusual fault and your fault finding efforts/skill certainly helped.Guys, I've asked Siglent (Jade) to refer this thread to R&D as it appears there might be a rare issue with the retaining silicon and the LCD connector.Maybe it will never happen again.

author: Bigfoot
author_rank: Contributor
timestamp: July 30, 2015, 09:33:11 am
content: It did look like a hardware issue rather than firmware and fortunately it was only a cable. Overall these scopes look pretty well constructed (apart from that power switch location) I would buy another.@tautech: A question for you, what are the chances of getting a new power switch from Siglent?Cheers,Bigfoot.

author: tautech
author_rank: Super Contributor
timestamp: July 30, 2015, 10:03:11 am
content: AFAIK it is part of the PSU and unlikely to be available as a separate item.I'm sure I've seen mention of similar breakages in past threads and mention of suppliers for them.Maybe it was a Rigol.It's getting late here and the brain is starting to fog up, I'll sleep on it.E14 or RS is where I'd go looking for one.

author: Bigfoot
author_rank: Contributor
timestamp: July 30, 2015, 10:22:16 am
content: All good. I sourced a couple on eBay UK. The switch manufacturer part no is KDC-A11 type 303. It'll be as good as new in no time at all.Bigfoot.

author: Roman Nartov
author_rank: Newbie
timestamp: September 29, 2015, 07:20:13 pm
content: Dear friends, please I strongly do not scold-how to communicate with you through translator. After reading your topic I think I encountered the same problem. Purchased on aliexpress SDS1102 Siglent CNL, received the goods at the post office brought it home and Oh include a screen around the perimeter gives some sort of red tides ( like stripes but with smooth contours ), these bands change their shape, e.g. press the menu button, each menu item with a right-to-left in the background more red tide, off the menu instead of black background get reddish. Advise something, a huge request to you friends that if you need to replace please provide a link to ebay or aliexpress if you want to do something with the device then please tell us in an expanded form on the fingers and if the photo will attach I will be very grateful to you. I enclose for your attention a video of my misfortune, probably will be clearer. Thank you for your precious time and understanding!https://youtu.be/XWv7_psA75k

author: tautech
author_rank: Super Contributor
timestamp: September 29, 2015, 07:40:08 pm
content: Welcome to the forum.The serial # indicates it was made in March 15 and is still in warranty.Do you have a Siglent dealer near you for assistance?I have not seen that same fault before.Normal recommendation from Siglent for screen faults is to re-seat the LCD ribbon cables. There are 3 connections, motherboard, and a socket the adapts the ribbon cable to the LCD panel flex PCB.Re-seat all 3 connections.Let me link Siglent to this thread and they should be online in ~5 hrs.As it is under warranty please wait for their instructions.

author: tautech
author_rank: Super Contributor
timestamp: September 30, 2015, 05:28:19 am
content: @Roman NartovSiglent Techical support engineer looked at your post and replied to me:Hi Rob,For this problem.Our suggestion is same like you .Best regards,JexyPlease see these examples of a similar LCD problem and how it was fixed:Quote from: Bigfoot on July 30, 2015, 12:29:17 amQuote from: Bigfoot on July 30, 2015, 06:16:25 amIt seems the white silicon rather than preventing connection problems on theLCD mylar connectionis actually causing a connection problem by way of shrinkage, partially pulling the connection apart.This is maybe something Siglent needs to address with a different more stable product.Please report your findings to us.

author: Roman Nartov
author_rank: Newbie
timestamp: September 30, 2015, 09:42:08 am
content: Dear friends, thank you for responding! I understand you correctly I need to release the cable from the connector and re-insert it into place? Sorry to ask again but I work with a translator. Thank you for your understanding.

author: tautech
author_rank: Super Contributor
timestamp: September 30, 2015, 10:24:50 am
content: Quote from: Roman Nartov on September 30, 2015, 09:42:08 amYes that is correct. One of the gray ribbon cables is for the front panel keypad and the other is for the LCD.Note there is another LCD connection hidden behind the LCD. You must check this other hidden LCD connection too.

author: Roman Nartov
author_rank: Newbie
timestamp: October 02, 2015, 04:11:33 pm
content: Thank you for the prompt information, please tell me where you are hidden behind lcd panel connection? These connections also go through a mechanical connector?In all the pictures you can see that the ribbon cable goes directly to the screen without mechanical coupling, it is necessary to remove the metal housing from the lcd screen?Please tell me if it doesn't work then can I change the screen like in this link :https://www.eevblog.com/forum/repair/sds1102cml-lcd-26-pin/msg720299/#msg720299And do I understand correctly that the model of this lcd screen AT070TN07 ?Thank you for taking the time and understanding of my problem

author: tautech
author_rank: Super Contributor
timestamp: October 02, 2015, 06:36:51 pm
content: Quote from: Roman Nartov on October 02, 2015, 04:11:33 pmSee movie @ 0.44.https://docs.google.com/file/d/0B_dQmKARz4hfSlhtU01yY1dlTXM/edit?pli=1Yes, the hidden interface connector is behind the metal housing.To access this connector you must dismantle the scope.

author: sonielkraf
author_rank: Contributor
timestamp: October 13, 2024, 07:45:18 pm
content: heloo tautech, ihave siglent sds1102dl, i incorect firmware update with another series, and now my scope is not normaly, do you have firmware for sds1102dl ? i attached image for firmware version befor updated, thanks to you...

author: tautech
author_rank: Super Contributor
timestamp: October 13, 2024, 08:27:04 pm
content: Quote from: sonielkraf on October 13, 2024, 07:45:18 pmWelcome to the forum.Sorry but no resources for early DL models, only for DL+.You might try Siglent HQ ......sales@siglent.com

author: coromonadalix
author_rank: Super Contributor
timestamp: October 14, 2024, 12:46:56 am
content: answered on his thread ...from herehttps://www.eevblog.com/forum/testgear/siglent-sds1052dl-firmware/