I think I've killed an FV-1...

S

sammo303

Member
I think I've managed to kill an FV-1 before getting any sound out of it!

I ordered a Deflector board with a pre-soldered chip and populated it in the normal manner EXCEPT I used an SMD 3.3v regulator on an adaptor board. I checked orientation on the datasheet but missed the critical note that orientation shown for the through hole part was from underneath the component whereas the orientation for the SMD related to a view from above. In short, Vin and Vout were reversed which has probably put close to 9v through it.

After finding the problem with the regulator I noted a dead short between the 3.3v rail and ground. I eventually traced this to a short between pin 8 and 11 on the FV-1. I presume this means a dead chip. Anyone think otherwise? Anyone know where I might get a replacement chip in the UK?

Bottom line, don't be stupid like me.
 
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Apologies, I should have been clearer. I have taken the chip off the board (after removing just about every other component) to make absolutely sure where the problem was, so the short is definitely in the chip.

I had wondered if it had triggered some sort of internal protection in the chip but I doubt it has any protection.

Thanks for the swift replies.
 
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Robert, just wanted to update this. I've been through the schematic and pcb continuity checking and inspecting and all is well except a lifted pad for the 3.3v regulator output. I can deal with this using a small jumper wire. All things considered I have been extremely lucky but I think this is also a good reflection of the quality of pcb you sell.

I have checked voltage ratings of the ICs and the EEPROM has an absolute maximum of 6.5V so it may well be damaged. The CD4049UB can handle 9v so should be OK. I have tested the voltage regulator and it gives a solid 3.3v so should be OK but I may replace just to be sure.

I will therefore order a new FV-1 chip. Would you like me to add a note about the EEPROM to the order? I suspect you won't get orders for FV-1 chips to Aberdeen Scotland very often so that should be a clue.

Thanks again and sorry for being a bozo with your product...
 
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