Hi,
I was testing a fully assembled v3.57+MS3+MS3X board on my bench today and I think I fried something. I was trying to adjust the VR pots using a press drill and a distributor. While adjusting the R52 VR pot, I accidentally dropped my metallic screwdriver in the SD card/U3/U4 area of the MS3 when everything was still powered on. Right after, I wasn't able to communicate with the laptop anymore.
After some basic power/ground testing, I found that the 5V at VCC was going from 5V to 0.5V really fast after a power ON with the external power supply. The output of U5 is a clean 5V, but VCC is 0.5V in steady state.
I then removed the expansion board and the MS3 daughter board and the VCC is now back at 5V. As soon as I reinstall the MS3 daughter board, the VCC drops at 0.5V.
I'm pretty sure I screwed up something, I just want to make sure what it is before ordering some costly parts.
Let me know if you have any ideas.
Thanks!
Sam
No VCC when MS3 daughterboard installed
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Re: No VCC when MS3 daughterboard installed
Have you peeked into that SD card socket, made sure there aren't just some contacts that got bent and are shorting?
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Re: No VCC when MS3 daughterboard installed
Some new info on this :
- On the main board, without the MS3 daugtherboard connected, I have 12V at pin#3 of U5 (should be 5V isn't it??). So, I also have 5V at pin #20 of the 40 pins daughterboard connector and also at the pin #26 of the DB37 connector of the main board. I suppose that U5 is bad. What other components might be faulty?
- With the MS3 daughterboard unconnected and sitting as is on it's own, there is continuity between pin #31 and pin #32 of the 34pins JP2. This means that there is a short between 5V and GND on the MS3 daugtherboard itself.
Now, what to do with this? I'm ready to send it to someone to have it diagnosed/repaired. Who should I contact in Quebec, Canada?
Thanks in advance!
Sam
- On the main board, without the MS3 daugtherboard connected, I have 12V at pin#3 of U5 (should be 5V isn't it??). So, I also have 5V at pin #20 of the 40 pins daughterboard connector and also at the pin #26 of the DB37 connector of the main board. I suppose that U5 is bad. What other components might be faulty?
- With the MS3 daughterboard unconnected and sitting as is on it's own, there is continuity between pin #31 and pin #32 of the 34pins JP2. This means that there is a short between 5V and GND on the MS3 daugtherboard itself.
Now, what to do with this? I'm ready to send it to someone to have it diagnosed/repaired. Who should I contact in Quebec, Canada?
Thanks in advance!
Sam
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Re: No VCC when MS3 daughterboard installed
Again, some update.
Please ignore the first point in my last post above. My ground lead from my power supply wasn't correctly connected and this lead to +12V on both left and right pins of U5. With the ground correctly connected, I now have 5V on all required places. I swapped the MS3 daughtercard with a known to be working one and all is fine now.
So, I have a MS3 daugthercard that is faulty because it has continuity between +5V and ground on itself. How do I deal with this. Please let me know what you think.
Have a good day!
Sam
Please ignore the first point in my last post above. My ground lead from my power supply wasn't correctly connected and this lead to +12V on both left and right pins of U5. With the ground correctly connected, I now have 5V on all required places. I swapped the MS3 daughtercard with a known to be working one and all is fine now.
So, I have a MS3 daugthercard that is faulty because it has continuity between +5V and ground on itself. How do I deal with this. Please let me know what you think.
Have a good day!
Sam
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Re: No VCC when MS3 daughterboard installed
If the daughter card is less than a year old, contact the vendor you bought it from directly; they're covered by a one year warranty.
For out of warranty daughter cards, Peter Florance is probably the best one to call.
For out of warranty daughter cards, Peter Florance is probably the best one to call.
Matt Cramer -1966 Dodge Dart slant six running on MS3X