Are these 03xx and 04xx replaceable by AO3400 & AO3409? These are cheaper and I have them in stock. :-)
I would say yes but happy to have a second opinion.
Regards,
Francesc....
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O48A and O37I components..........could you please help me to identify them?
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They are from a DCC railroad decoder.
I am "almost certain" that O48A might be a N-Channel mosfet, and O37I a P-Channel mosfet...........however, not able to find them with these references.
Thanks in advance for any hint.
Francesc....
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Thanks for the feedback, stj.
Time for silly questions:
I am starting to thing that nothing is wrong with these 5 RPIs. All of them are RPI model B v1.2.........If I see the image I don't see any "wireless" chip.
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Whereas for the RPI model 3 B+ 1.3 there is (the raspberry chip).
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Raspberry pi3b: No Wireless LAN interfaces found
Hi:
I've just bought 5 faulty Rpi 3 model B. All of them works with LAN, but no WLAN are detected (no wifi).
The SD I am using is the one where other RPIs work perfectly fine.
Could it be a hardware topic and not a software topic? If so............which part of the RPI 3b is manages the Wifi part?
Regards,
Francesc.
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Today I had some spare time and I've tried it again. I finally fixed it. The rele wasn't making any noise so I've checked the components near to it. There was a tinny SMD capacitor shorted(C21) and the T4 diode (D5) was open circuit (not shorted but faulty). I replaced both and finally the SMPS came back to life.
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What a pain in the ass this one.......🤣
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Thanks for the help....
Measurements (diode junction) suggest that F68 might be a TPCF8402: [URL="https://pdf1.alldatasheet.es/datasheet-pdf/view/348372/TOSHIBA/TPCF8402.html"]ttps://pdf1.alldatasheet.es/datasheet-pdf/view/348372/TOSHIBA/TPCF8402.html[/URL]
No clue regarding BAPLZ neither.........measurements with a working one suggests a N channel mosfet.
Regards, FrancescThanks for the help....
Measurements (diode junction) suggest that F68 might be a TPCF8402: [URL="https://pdf1.alldatasheet.es/datasheet-pdf/view/348372/TOSHIBA/TPCF8402.html"]ttps://pdf1.alldatasheet.es/datasheet-pdf/view/348372/TOSHIBA/TPCF8402.html[/URL]
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Thanks,
I am trying (with a lot of limitations) to understand what's wrong with this DCC decoder. If I switch it on for a fraction of time, I am able to see in the infrared camera a problematic section (marked in the foto). The heat flow is that first lights the resistor and secondly the 1F IC. These components seem good if I test with the multimeter...........however I will remove them from the PCB and let's see if I find something faulty.
[URL=filedata/fetch?id=3211315&d=1707216266][ATTACH=JSON]{"alt":"Click image for larger version Name:\tIMG_0005_deco.jpg...Last edited by Francesc V.; 02-06-2024, 05:00 AM.
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HB 5pin SMD...........what it could be?
Hi:
Any idea what these "HB chips" might be? This is also from a DCC railroad decoder.
BR,
Francesc.
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Yes,,,,,,other DCC decoders use similar chips. I'll measure them out of the PCB.........I wasn't able to get 44k ohms between base-emiter. It might be faulty. Thanks for the feedback.
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G01H smdcode....what it could be?
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There are 3 chips marked as "G01H". Any idea what they might be?
Regards,
Francesc....
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I just desoldered and it has the following pinout/layout:
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This does not match with the suggested one, right?I just desoldered and it has the following pinout/layout:
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This does not match with the suggested one, right?...
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Looking for 1H mosfet in a Lenz DCC decoder for railroad
Hi:
I am almost certain that this is a Mosfet, but I am not able to find it. Could you please guide me? This is a really tinny one.
Thanks in advance,
Francesc....
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