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IK5WWP
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CPU hot and no connection to PC
« on: 10. February 2018, 15:43:38 »

Strange chaotic behaviour testing my ui-board...
Jumper on P6
+5V on pin 28
Mini USB connected to the pc (tested with two different)

No white LCD, but sometime is flickering and sometime it's dark
Sometimes green led flickering or sometimes the red
Pc says "device not recognized"
Current absorbed is obout 500 mA and the mcu is a little hot...

What can it be? 

Thank you in advance, Lorenzo IK5WWP

Edit by Mod:
Please do not enter any threads with new problems but open a new one.
Thank you!
« Last Edit: 10. February 2018, 15:59:46 by DL8EBD » Logged
DL8EBD
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Re: CPU hot and no connection to PC
« Reply #1 on: 10. February 2018, 15:52:52 »

CPU soldered in the wrong direction?
500mA is too much...
« Last Edit: 10. February 2018, 15:55:31 by DL8EBD » Logged

bitte keine technische Fragen oder Diskussionen via PN, dafür ist das Forum da.
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Thomas
IK5WWP
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Re:CPU hot and no connection to PC
« Reply #2 on: 10. February 2018, 16:12:33 »

Thank you Thomas.
Checked the cpu: the direction is right, no shorts between pins and no unsoldered pins.
Tried to remove the TXCO (I was thinking about to much hot during soldering), but no changes: still 500mA and the UI_3V_MCU is around 2V instead of 3V...
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Re:CPU hot and no connection to PC
« Reply #3 on: 10. February 2018, 16:17:14 »

Please double check the orientation!
The text on the CPU is the right indicator not the one or two dot(s)

You can find a picture in this thread (first posting)
https://www.amateurfunk-sulingen.de/forum/index.php?board=18;action=display;threadid=930
« Last Edit: 10. February 2018, 16:18:10 by DL8EBD » Logged

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vy73
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Re:CPU hot and no connection to PC
« Reply #4 on: 10. February 2018, 16:30:58 »

Consumpting 500mA I think MCU is dead. This is much to high current. Maybe it is wrong orientated but it does not matter. If there is not a short between VCC and GND pins I would no longer trust a MCU which was gettings warm and has consumpted 500mA...

vy 73
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Re:CPU hot and no connection to PC
« Reply #5 on: 10. February 2018, 16:36:36 »

Double checked the cpu and the other components under the UI_3V_MCU: all right placed...
« Last Edit: 10. February 2018, 16:37:17 by IK5WWP » Logged
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Re:CPU hot and no connection to PC
« Reply #6 on: 10. February 2018, 16:43:34 »

I had a similar problem, MCU-regulator is hot and on MCU-side
2 V. In my way i have the wrong direction of the eeprom.
Look at

https://www.amateurfunk-sulingen.de/forum/attachments/IC7_Einbau.jpg
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Re:CPU hot and no connection to PC
« Reply #7 on: 10. February 2018, 16:53:21 »

I also have had an ui-board with no signs of life in the mcu. But it was nice warm!
The solution was no clock-signal, because the U5 oscillator was soldered in the wrong orientation. After turning the Clock oscillator-chip around, everything was running fine. I think, without a clock signal the mcu is only drawing current...
Check the 16 MHz at Pin 3 of U5 !
« Last Edit: 10. February 2018, 16:59:28 by DF5LI » Logged

73,  Harri
IK5WWP
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Re:CPU hot and no connection to PC
« Reply #8 on: 10. February 2018, 17:02:01 »

Thank you all.
Checked and re-checked also the eprom.
Removed too, but the corrent absorption is still the same.
I really start to think that the cpu is burnt as Andreas said above...
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Paul C. H.
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Re:CPU hot and no connection to PC
« Reply #9 on: 10. February 2018, 17:56:48 »

My approach was to solder minimal component to test to CPU by DFU connection
not anything else.

CPU,
regulators and these 2R2 resistors, etc
16MHz TCXO, 32768k
only a few capacitors, for each DC rail 5V, 3V3_CPU, 3V3_analog
reset circuit
temporary wire to 'borrow' 5V from mini-USB when tested without RF board.
temporary wire to 'borrow' 3V3 from 3V3_CPU to 3V3_analog

tested DFU ok

solder additional components and re-test DFU after soldered every 10 items (approximately)
'roll-back' if I found DFU doesn't work / or incorrect current consumption.


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IK5WWP
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Re:CPU hot and no connection to PC
« Reply #10 on: 10. February 2018, 18:16:58 »

Quote from: Paul C. H. on 10. February 2018, 17:56:48
My approach was to solder minimal component to test to CPU by DFU connection
not anything else.

CPU,
regulators and these 2R2 resistors, etc
16MHz TCXO, 32768k
only a few capacitors, for each DC rail 5V, 3V3_CPU, 3V3_analog
reset circuit
temporary wire to 'borrow' 5V from mini-USB when tested without RF board.
temporary wire to 'borrow' 3V3 from 3V3_CPU to 3V3_analog

tested DFU ok

solder additional components and re-test DFU after soldered every 10 items (approximately)
'roll-back' if I found DFU doesn't work / or incorrect current consumption.




I totally agree with you! I will surely follow this approach the nex time!
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IK5WWP
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Re:CPU hot and no connection to PC
« Reply #11 on: 10. February 2018, 21:34:48 »

I have found that also the the 3V regulator was burnt.
So, in the next days I will replace it.
Also the MCU will be replaced, because I am not shure if it is still good.
Before put on place the new MCU I will check again the 3V line to avoid any other component eventually damaged.
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IK5WWP
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Re:CPU hot and no connection to PC
« Reply #12 on: 15. February 2018, 11:33:31 »

Today update.
Replaced 3V regulator and now I have a stable 3V and a stable white screen.
Not yet installed the new MCU because a I'm waiting it for tomorrow.
More news asap.
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Re:CPU hot and no connection to PC
« Reply #13 on: 15. February 2018, 11:42:09 »

Stable 3V???? Before desoldering your MCU have a try if is still alive....

vy 73
Andreas
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Re:CPU hot and no connection to PC
« Reply #14 on: 15. February 2018, 11:57:07 »

Quote from: DF8OE on 15. February 2018, 11:42:09
Stable 3V???? Before desoldering your MCU have a try if is still alive....

vy 73
Andreas

Already desoldered because (as you rightly said) I don't trust the old warmed up MCU.
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Diskussions- und Newsboard des DARC-Ortsverbandes I40  |  allgemeine Kategorie  |  OVI40 SDR Projekt (English AND German discussions around OVI40 SDR project) (Moderators: DF8OE, DL1PQ)  |  Topic: CPU hot and no connection to PC <- zurück vorwärts ->
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