What is the point of this PWM riser?  - Page 1
Forum section: electronics / repair

author: jerb
author_rank: Contributor
timestamp: October 23, 2019, 04:56:29 pm
content: I seem to have a short inside this pwm riser and i'm not sure what to do about it. I'm not too concerned about the missing components around the side because i can replace those at some point but im a bit annoyed to think these manufacturers seem to keep building devices that become more and more irreparable due to these terrible designs.More then anything just want to know what is even the point of one of these? The previous designs on this board and other boards have all had the pwm directly on the board except this one. thanks.

author: langwadt
author_rank: Super Contributor
timestamp: October 23, 2019, 05:14:41 pm
content: maybe the riser is a pcb with embedded components

author: jerb
author_rank: Contributor
timestamp: October 23, 2019, 05:42:24 pm
content: I had thought of that but there doesn't appear to be anything additional added to this design then to the previous. Very frustrating. This is for a Leica Q2, I seem to manage finding the most obscure cameras to work on. I'd like to think that it's just a direct riser and maybe i could make a replacement at jlpcb with a 2mm board but even then i would need to be able to reverse engineer something i can't get a good continuity reading on since there's that dang short.Added note is the riser does appear to be slightly magnetic. So im not sure if it's ferrite based.

author: langwadt
author_rank: Super Contributor
timestamp: October 23, 2019, 06:08:58 pm
content: Quote from: jerb on October 23, 2019, 05:42:24 pmembedded inductor?https://youtu.be/K6om51cr8Mk

author: fzabkar
author_rank: Super Contributor
timestamp: October 23, 2019, 07:05:49 pm
content: Here is a list of Panasonic cameras that use the same part:https://photo-parts.com.ua/parts/dbphp.php?part=BD8357Try to find service manuals for the above cameras, eg DMC-G6:https://elektrotanya.com/showresult?what=panasonic%20dmc-g6&kategoria=&kat2=all

author: jerb
author_rank: Contributor
timestamp: October 23, 2019, 08:14:15 pm
content: Yah i've used that website in the past and it's great. I have an lx100 lumix board on hand but the layout of capacitors is a bit different. it looks like it uses fewer larger caps. The main hold up i have with the repair is coming from the riser because it has a short inside that i can't get to. Otherwise i would be able to reference the other same PWM schematics, i just have no clue about this stupid riser.That video is great though, It may be my only option to go get the part x-rayed. and reverse engineer it from there. I contacted leica and they told me the repair would be 350+ labor but due to there having been previous liquid damage causing the failure im worried they might opt to not repair it, and it would just end up being a waste of time and money sending it off to them.

author: jerb
author_rank: Contributor
timestamp: October 23, 2019, 08:22:43 pm
content: The underside of the component looked like this. I stupidly put it back on because i thought i had dug out the short but it seems not.It's not exact but its close. The entire center pad area are all ground.

author: jdraughn
author_rank: Regular Contributor
timestamp: October 23, 2019, 08:27:32 pm
content: Maybe they did it that way because they are prone to shorting out and wanted to make it easier to replace?