EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: DoublesAdvocate on May 03, 2023, 01:07:52 pm
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I have a few broken PS3's (CECH-4XXX) that refuse to read discs. After a bit of google and some prodding with a multimeter I've determined that one of the little SMD fuses near the drive circuitry has blown. I'd love to replace it and get the consoles reading again but I have no idea what the value(s) of the fuse is as there aren't any markings on the fuse or board and (obviously) there are no repair manuals or documentation for the device online. Does anyone know of a way that I can determine the value of the fuse? I do have a donor board where I can test a working version of the fuse, but it also has no markings so I'm at a loss for HOW to actually test it, suggestions?
Question #2 is:
I'm trying to build a passive headphone/mic mixer and would like some sort of switch that can swap the function of 2 pins on a TRRS connector so it can support both common microphone wiring configurations. Does anyone have any suggestions for what type of switch I can use for this?
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I have a few broken PS3's (CECH-4XXX) that refuse to read discs. After a bit of google and some prodding with a multimeter I've determined that one of the little SMD fuses near the drive circuitry has blown. I'd love to replace it and get the consoles reading again but I have no idea what the value(s) of the fuse is as there aren't any markings on the fuse or board and (obviously) there are no repair manuals or documentation for the device online. Does anyone know of a way that I can determine the value of the fuse? I do have a donor board where I can test a working version of the fuse, but it also has no markings so I'm at a loss for HOW to actually test it, suggestions?
If the fuse is the only problem on the broken board you can measure the current that normally flows through it by bridging it with a multimeter set to measure current. Start with the 10A range or whatever is in that ballpark. If the PS3 then reads discs note the highest current and get a fuse say 50% higher than that.
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Does anyone have any suggestions for what type of switch I can use for this?
A red one?
seriously, more info needed of what your trying to achieve would be useful,
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Question #2 is:
I'm trying to build a passive headphone/mic mixer and would like some sort of switch that can swap the function of 2 pins on a TRRS connector so it can support both common microphone wiring configurations. Does anyone have any suggestions for what type of switch I can use for this?
DPDT
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Does anyone have any suggestions for what type of switch I can use for this?
A red one?
seriously, more info needed of what your trying to achieve would be useful,
Sorry yeah I think what wasedadoc suggested is what I'm looking for.
Basically there are 2 common wiring configurations for headphones, CTIA and OMTP. The wiring they use for the output of sound/music is the same between them but the configuration for inline microphones swap poles and I'm trying to build a circuit that you can select manually rather than having to rely on detection circuits.
(https://forumstatic.oneplusmobile.com/opforum-gl/upload/image/front/thread/20220615/854882/1089215507947061253/1089215507947061253.png)
(not sure if I embedded that correctly)
I have a few broken PS3's (CECH-4XXX) that refuse to read discs. After a bit of google and some prodding with a multimeter I've determined that one of the little SMD fuses near the drive circuitry has blown. I'd love to replace it and get the consoles reading again but I have no idea what the value(s) of the fuse is as there aren't any markings on the fuse or board and (obviously) there are no repair manuals or documentation for the device online. Does anyone know of a way that I can determine the value of the fuse? I do have a donor board where I can test a working version of the fuse, but it also has no markings so I'm at a loss for HOW to actually test it, suggestions?
If the fuse is the only problem on the broken board you can measure the current that normally flows through it by bridging it with a multimeter set to measure current. Start with the 10A range or whatever is in that ballpark. If the PS3 then reads discs note the highest current and get a fuse say 50% higher than that.
Okay perfect, I'll give that a shot.