Electronics > Repair
Help with bricked APC UPS SMT1500
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KrabKley:
I have SMT3000I and the same problem. I want to solve the problem with your advice, but the structure of vertical UPS is different. everything is on 1 board and there are no such connectors.
There is a similar connector J602 and can someone tell me the pinout?
asis:
Hi,

You can reflash via this connector (J602).
Just check the pins match - indexing given by @AstroAU.

6 - Reset                 -  IC603 STM pin 7
5 - Ground               -  IC603 STM pin 12,18,31,47,63
4 - PB3 / JTDO         -   IC603 STM pin 55
3 - PA14 - SWCLK    -   IC603 STM pin 49
2 - PA13 - SWDIO    -   IC603 STM pin 46
1 - VCC                   -   3.3V
KrabKley:
I had to ring everything up and everything worked out. Thank you all very much. The SMT3000i is working again.

I also want to say that it was very difficult to connect ST LINK St link ST-Link V2 because.
1. Did not work with the USB extension cable.
2. Connected directly to USB 2.0, it worked but with errors.
3. Only after I plugged it into USB 3.0 did everything work perfectly!
mangup:
Hello everybody.
I upgraded my ups SMT1000I, and after upgrade UPS is bridged. I use Jeffwdh reference and flashed via STlink bin from smt1500 - same board id18. Now display is live, but don't recognize that is powered on main plug and don't recognize that have battery. That is enough to not let me to start upgrade.

I notice that MCU and MBL version is 0. Serial, usb, NMC work but can't do anything with UPS settings.

I try to update via xmode , but I'm not sure I'm doing it right.

Is there something that I can try ?
tom_e:
Hi mangup,

It may have been bricked during 8051 (plcc chip) MCU upgrade (stage where the lights blink slowly). You need to reflash MCU but it is not possible as upgrade wizard will not let you, and I doubt it will work if the 8051 is corrupted because the bootloader is probably gone.

Can you confirm MCU is dead by probing UART pin, if there is no activity it's probably bricked. The 8051 should be spamming characters back to main chip, and there should be a single character being spammed on rx (pin 11) so check tx (pin 13) to see if its dead. If the beeper is constantly buzzing or the transformer is humming loudly this also hints dead 8051.

Also please confirm model of 8051 chip, e.g. 89C51RC2. If it is this chip you would need to flash it directly (it has some lock which you need to reset and original firmware cannot be recovered after this). You will need an existing copy of the firmware image as it's usually read protected.

Hope this is helpful
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