Siglent SDS1204X-E Flexible Printed Cable J12 connector P/N? - Page 1
Forum section: electronics / repair

author: kerouanton
author_rank: Regular Contributor
timestamp: August 16, 2023, 06:14:28 pm
content: Hello,While tearing down my (out of warranty) Siglent SDS1204X-E in order to add JTAG and RS232 outputs on the PCB, I inadvertently broke the small black bar that locks the Flexible Printed Cable connector for the LCD screen on the white connector (J12). It seems to be a 52-pin connector (rough count), but I wasn't able to retrieve the Part Number. If anyone can help me get the part number, I'd be able to order a spare connector, get the black lock bar from it to place it back on the already soldered J12 connector.Many thanks! would be appreciated. cc @tautech maybe?Bruno

author: tautech
author_rank: Super Contributor
timestamp: August 17, 2023, 10:21:31 am
content: Yes they are fragile if not worked correctly however if the full locking bar remains, when locked in place it should not shift even if broken.BTW, what are you hoping to achieve from sniffing the data busses ?

author: kerouanton
author_rank: Regular Contributor
timestamp: August 19, 2023, 11:35:47 am
content: Quote from: tautech on August 17, 2023, 10:21:31 amI'm just learning JTAG on ARM cores and FPGA and thought it would be convenient to test that on the SDS, since it has all of this embedded on the mother board, as long as (it seems) JTAG connectors ready to be soldered.About the issue, I fear it's worse than expected. The FPC ribbon cable seems to have a short, and the LCD backlight doesn't seem to turn on. I downloaded the service manual and should make some tests (as soon as I am back home, I don't have my full lab with me). I really hope there is no damage. Has anyone ever had this issue before?

author: DavidAlfa
author_rank: Super Contributor
timestamp: August 19, 2023, 11:40:40 am
content: Is it burned? Tinned? Or just damaged?

author: kerouanton
author_rank: Regular Contributor
timestamp: August 19, 2023, 11:47:03 am
content: It seems tinned but wasn't a few minutes before I took the picture. In short, the small black locking bar from the connector broke at one end, and the cable wasn't safetened any more correctly and could move away. It resulted by the backlight being on but no image, or image but with the wrong colors (most probably due to misalignment of the flat cable and the connector). I tried to replace the cable back in place, while watching the screen to see if the colors were going back to normal, but I guess a short appeared and the screen went black. When I removed the ribbon cable I saw this "tinned" aspect on the right side of the connector, and my guess is there was a short on this part (VCC for backlight??) that melted the connector and/or cable?I'm away from home for a couple of days and won't be able to check anything sooner, I just fear I've broken the whole scope...

author: tautech
author_rank: Super Contributor
timestamp: August 21, 2023, 08:23:15 am
content: These ribbon cables are available as a spare part however I don't know if EU branch will hold stock of any.IIRC they terminate onto the rear of the display into another connector block which then terminates into a mylar flat cable to the LCD.You do need almost completely dismantle the scope however it is not too difficult with a selection of Torx screwdrivers plus some other basic tools.With luck Siglent Germany can also help you with a dud mainboard to extract the ribbon cable connectors from.

author: kerouanton
author_rank: Regular Contributor
timestamp: August 23, 2023, 03:38:50 pm
content: Quote from: tautech on August 21, 2023, 08:23:15 amThank you very much, I'll contact Siglent Germany ! I'm also looking forward to see the upcoming HD version, maybe that will be an option. Have a nice day.