I stupidly killed my APM2 by plugging the Hitec Optic Rx Supplimentary Power Cable port plug into one of the standard Servo ports thus feeding 12V into the APM.
The board powers up but all the LED's are lit and it's not recognised by a PC through USB.
The only component I can see that looks damaged is a small IC to the right of the ATMEGA2560 (see in red below), what is this component? The only number I can find for it is 21 JBR or 26 JBR although mine looks to be 08TI JBR.
The cost to send this back to 3DR is quite pricey from South Africa so I'd rather either try fix it or use the money for a new one. I do know someone here with specialist equipment to repair this kind of thing so is that chip available somewhere and is it worth repairing?
Replies
Ok, we have replaced the TS5A23257 chip and the ATMega 2560. Using an AVRISPmkII and AVR Studio I'm getting the following error:
Everything is connected correctly, however there is a resistance of 62 ohms between the MOSI and SCK pins. Now I don't know if that's normal or what would cause that resistance or even where to look.
Can anyone help here please because I'm just stabbing in the dark?
Thanks, I got the eagle files and got the part number from there. My friend who has the right equipment checked the board and found the Atmega 2560 was also gone, so have replaced that and am waiting on stock of the TS5A23257 chip. The APM2 is now showing the two yellow LEDs and the green.
The new Atmega has no bootloader so I was tinkering to see if I could burn a new one, followed this: http://www.instructables.com/id/Burn-Arduino-Bootloader-with-Arduin.... Have double checked everything but am get these errors:
avrdude: stk500_program_enable(): protocol error, expect=0x14, resp=0x50
avrdude: initialization failed, rc=-1
Double check connections and try again, or use -F to override
this check.
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51
So obviously doing something wrong. If it's possible to burn the bootloader with another Mega this way, it would be great but if not I think I should just take the board back to my mate when the new chip arrives and get him to do it.
EDIT: tried this too but no luck (http://www.gammon.com.au/forum/?id=11635)
Hi,
The little 10 pin IC is the TS5A23257 switch.
Actually the APM should be able to start without that one (unless it is shorting out the supply), only the serial connections on the UART0 port and the USB one will not work. So I think there might be more parts smoked.
Actually I might want to buy the board if you want to sell it, but I'm afraid I will not pay very much...
... I have a physically pretty beaten-up but electrically OK one (shot down from a tree with a cannon...), and I have the equipment (and stupidity??) to try move all the parts to another board...
Regards
Soren