Electronics > Repair

Repair Siglent SDS1102DL

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Bigfoot:
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.

Roman Nartov:
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

tautech:
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.

tautech:
@Roman Nartov

Siglent Techical support engineer looked at your post and replied to me:
Hi Rob,

   For this problem.
   Our suggestion is same like you .
   
    Best regards,
    Jexy


Please see these examples of a similar LCD problem and how it was fixed:


--- Quote from: Bigfoot on July 30, 2015, 12:29:17 am --- 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.

--- End quote ---

--- Quote from: Bigfoot on July 30, 2015, 06:16:25 am ---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.


--- End quote ---

It seems the white silicon rather than preventing connection problems on the LCD mylar connection is 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.

Roman Nartov:
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.

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