Fault (red) LED getting on iMX53 QSB

[syamkumar]

Recently i purchased a i.MX53 quick start board, and I observed only "FAULT" LED and 5v LEDs are turned ON during power-up. Appreaciate help from community to find a solution to mak it work.

[weidong_sun]

Hello,Syam,

      If you press SW2 button, Can the system normally boot  and all LEDs be turned on ?

Reards,

Weidong

[syamkumar]

Weidong,

With "PWR" (i think SW2) button, i see "LCD", "3.3V", and "PMIC" LEDs are blinking along with "FLT" and "5V" LEDs for 1 to 2 seconds. After 2 seconds "FLT" and "5V" LEDs are turned ON

Regards

Syam

[weidong_sun]

Hello,Syam,

     SW2 is power button, After you insert 5V adapter, and press SW2, system will start to work if SD card exists. you can connect DB9 connector to your host by a USB-RS232 cable , check if system has started.

Regards,

Weidong

[syamkumar]

Weidong.

Thanks.

As you suggested, with 5V supply along with SD card (after pressing PWR button) i see no change. Still "FLT" LED is ON.

I see only junk characters on my RS-232 console (minicom). I configured minicom with 115200, 8 databit, 1 stopbit and no parity.

Regards

Syam.

[weidong_sun]

Hello,Syam,

     There are 2 SD connectors, one is MicrosSD,the other is 8bit eMMC card. I remember i.MX53QSB boots from MicroSD by default. you can refer to it's schematic.

     the SD card you are using is together with i.mx53QSB when you bought it ? If it is , In this SD card, ubuntu system should has been installed.

Regards,

Weidong

[syamkumar]

Weindong,

Yes, I am using the microSD card received with board.

I think there is something wrong with board, I dont see "3.3V" LED not getting ON.I doubt 3.2V regulator (U29) is not working correctly; hence all this issue. Could you correct me if I am wrong.

Regards

Syam.

[weidong_sun]

Hello,Syam,

     Did you measure this voltage ?

weidong

[syamkumar]

Weidong

I see no volatage on pin 3 and 6 of U29, 3.2V is not generated.

Syam

[weidong_sun · Accepted solution]

Hello,Syam,

      the board you are using is I.MX53-START-R based on MC34708 PMIC, it is not QSB board.  As soon as you plug 5V adapter into power jack, system will boot at once, don't need to press power button. Now, please measure the voltage of VCC_BP which is should be 3.8V. Measuring point is SH33 position. if VCC_BP is OK, all voltages on mc34708 should output.

      Then 2V5_VGEN2 will enable U29, and 3.2V is normal.

Regards,

Weidong

[syamkumar]

Thanks Weidong,

Issue got resolved by replacing the power supply recieved along with board.

Regards

Syam.

[weidong_sun]

Ok, Good Luck !

    Any questions, Please let me now !

Regards,

Weidong