Fixing a completely dead Marshall Stanmore Bluetooth speaker
Something unusually young on my workbench: this Marshall Stanmore Bluetooth speaker from 2014 is completely dead. In this video I'm going to rebuild the problematic section of the power supply.
I found 3 forum threads in total discussing several technical issues and repairs related to this device:
1) Badcaps.net (English): www.badcaps.ne...
2) Mikrocontroller.net (German): www.mikrocontr...
3) Retrotechnique.org (French): forum.retrotec...
The hand drawn schematic shown in the video can be found over here: www.mikrocontr...
List of components I replaced:
Q7 (original: FDPF10N60NZ, replacement: STFU10NK60Z)
U1: OB2269
ZD3: zener diode, original value unknown but replaced by 3x 8.2V in series
R96: 10k
C4: 3.3µF / 50V
C49: 100µF / 63V
C82: 22µF / 50V
WARNING: Do not attempt to repair electronic equipment if you don't know what you're doing.
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Music by Karl Casey @ White Bat Audio
Noise video footage by Milan Matos
Electrocution logo by Nesdon Booth, The Noun Project
Пікірлер: 17
Nice work! Seems you would benefit from a higher solder iron temperature, especially when desoldering the big buffer cap, also when using solder braid. Either a tip with more thermal mass, or an iron with better temp control
@retro_tech
4 ай бұрын
Yes, I could have turned up the heat a bit more for those.
Thanks a lot! My Stanmore 1 powers up and connects to Bluetooth but there is no audio, even not when I send music through the input through cable. Strangely, when I switch it off the led remains on. Any idea where to start?
@retro_tech
23 күн бұрын
That sounds like an issue with the amplifier. I would start looking in that area. Might be a blown transistor or mosfet in the amp.
Great video. Gives me hope. I have the same speaker and it’s been out of commission for a while. I’m going to attempt to fix it like on your video. Wish me luck🤞🏼.
@retro_tech
3 ай бұрын
Good luck!
@Disceomn3s
23 сағат бұрын
@@retro_techOMG I just found this video. Seems like you’re in the EU and not stateside else I’d beg you to take on mine as a project to fix and I’d pay you for your time. It’s been sitting in its box in the garage for three years now but I refuse to throw it out because I know somehow there’s a way to fix it. I don’t know how to do any of this stuff. Can I PayPal you $50 just for your time to maybe help me find someone qualified in my area (California, Bay Area) that is qualified to do something like this based off your vid and parts list? I refuse to scrap this thing I loved it.
@retro_tech
19 сағат бұрын
@@Disceomn3s The owner of the speaker recently informed me that it broke down again. So it will be back on my bench soon... Could be that I made a mistake during the repair, we'll have to see. So, the part list in the description is quite preliminary at the moment. I wouldn't mind helping you, but I don't have any contacts in your area. In any case, anyone with the skills to do SMD soldering should be able to fix this. Good luck.
@Disceomn3s
9 сағат бұрын
@@retro_techdo you plan to do a follow up? Maybe making sure it’s fixed for good, lol. I’ve been waiting 4 years but I have no problem waiting another few months while you see if you can fully fix it.
@retro_tech
6 сағат бұрын
@@Disceomn3s Yes, I will probably do a followup
Did you clean the flux off the bottom of the PCB after repair?
@retro_tech
4 ай бұрын
It's Chipquick no-clean flux
Hi! Maybe you have this speaker software? My speaker wont turn on, i think it is software damage 🤦♂️
@retro_tech
2 ай бұрын
No I don't have the software and I seriously doubt that would be the issue.
Lekker dutch accent😂
Do you solder with leaded or lead free?
@retro_tech
4 ай бұрын
In this video I used leaded solder (except for the paste, which was lead free).