Its a 3V3 regulator, LP2985A-33.
The capacitors around it are 100n, except the one from pin 4 to GND that is 10n.
The capacitors around it are 100n, except the one from pin 4 to GND that is 10n.
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Thanks a lot. Do you know where does the 3v3 regulator connects to as my board is pretty bad burnt up and the pads are missing 🤔
Kind-a yes, but i still don't know as the pads are missing which trace is for Vout and which Vin....I suppose the one going to PIC is 3.3v ?
Not sure if I can make a reliable repair with a this hole in the pcb. I think to reject this one.
Not sure if I can make a reliable repair with a this hole in the pcb. I think to reject this one.
Hi, I notice that you get discouraged very easily.
Even if the pads are missing, you can very well find a solution to make a reliable repair.
The component is perfectly available, and in the worst case, you can cool it in other ways.
What worries me is that if this component is damaged, 90% of the fault lies with the microcontroller that caused it to overheat.
Before starting the repair check that between pin 1 and pin 32 of the microcontroller (out from the board) there is a high resistance, because if you unfortunately have a low resistance, it will mean that the microcontroller is shorted, so it will no longer be worth carrying out the repair. because you will need to get a new programmed microcontroller, but BANDA does not supply them (unless you are an authorized repairer).
Is pin 1 shorted with pins 5 and 17 of the mcu ?
If so, there should be 3.3V present on those 3 pins.
If so, there should be 3.3V present on those 3 pins.
For approximately 5 years I have not managed to fix only a two Alpine MRV-M500, due to obsolete irs20956 (tried with 3 chips from China with no avail) , a few amps based on Tripath IC due to bad TA0103A ic's and some really bad burnt amps with half of the board toasted. Оh and the Rockford Fosgate T10001bd which i can't still fix.
I don't have any background in engineering, electrical stuff and so on, so yes, sometimes my questions looks like a noob ones, sorry about that. Mostly what I've learnt is from school (Ohm's law), Perry's Guide and from this forum (BIG thanks to ALL of YOU). I work a regular job in a completely different field (Computer science) and i'm doing this mostly as a hobby and I don't really charge my friends a lot for repairs...so yes, sometimes when i get overwhelmed at my regular job and I have like 10 amps with some weird (at least to me) issues, I get frustrated a bit.
I know some of You are engineers, electricians, I know there are even people in the rocket science field working for NASA, that's a really high level considering my amateur self made forum thought guy.
I live in a small Balkan country so, not a lot of stuff is available. Sometimes even the shipping from EU kills the deal....
There is 2.3 ohms between pin 1 and pin 32 of the PIC. So this one....no luck.
Is pin 1 shorted with pins 5 and 17 of the mcu ? - they are shorted indeed.
I don't have any background in engineering, electrical stuff and so on, so yes, sometimes my questions looks like a noob ones, sorry about that. Mostly what I've learnt is from school (Ohm's law), Perry's Guide and from this forum (BIG thanks to ALL of YOU). I work a regular job in a completely different field (Computer science) and i'm doing this mostly as a hobby and I don't really charge my friends a lot for repairs...so yes, sometimes when i get overwhelmed at my regular job and I have like 10 amps with some weird (at least to me) issues, I get frustrated a bit.
I know some of You are engineers, electricians, I know there are even people in the rocket science field working for NASA, that's a really high level considering my amateur self made forum thought guy.
I live in a small Balkan country so, not a lot of stuff is available. Sometimes even the shipping from EU kills the deal....
There is 2.3 ohms between pin 1 and pin 32 of the PIC. So this one....no luck.
Is pin 1 shorted with pins 5 and 17 of the mcu ? - they are shorted indeed.
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