Do you recommend soldering on a running system?
To me it is about what is given the first time when voltage is being applied. Or will it work if I replace the quarz while there is already voltage applied to vdd and vss? I doubt so.
|
Do you recommend soldering on a running system?
To me it is about what is given the first time when voltage is being applied. Or will it work if I replace the quarz while there is already voltage applied to vdd and vss? I doubt so.
Last edited by Ted's; - 27th July 2008 at 00:42.
|
If it's only 5v and you've only got a PIC, an LED, a resistor, and the rest of the glue that goes with, sure...why not?Originally Posted by Ted's
|
It is not. Just look at the voltage levels being applied. There need to be outside devices which apply the voltage to the pic.
skimask, the main issue is that the device is not starting. I want to solely focus on that.
I know four main error sources: The pic's hardware, the pic's software, the quarz and voltage applied to vdd and vss.
Right now I suspect the quarz to be faulty.
Last edited by Ted's; - 27th July 2008 at 00:47.
|
Ok, fine. Let us know what you did to troubleshoot the problem and what you did to fix it.
|
I replaced the quarz -> No change.
I saw some soldering issues, fixed them and connected some solder points with others having the same potential via wire to make sure that there are no facers. I measured using my multimeter and the connection was there. I switched on and again, nothing.
For other measurements refer to my previous posts in this thread.
|
Some photos of the setup. Quarz currently removed.
Last edited by Ted's; - 27th July 2008 at 09:07.
|
Wow! A bit of a mess to contend with...
Are you sure you don't have any unseen solder bridges anywhere?
Are you sure you don't have any open traces anywhere?
I see a LOT of little solder balls floating around the circuit board. Any shorts?
Invest in a small brush and some 'rubbing alcohol' and clean up that PCB.
How do you program the PIC? How do you know that you are actually programming the PIC?
Does it read back with the same code you programmed it with?
Have you even considered changing the program to the one I suggested? Or are you still running the same 'one-shot' 'turn the leds on once then turn them off' program?
Do you have a decent cap across Vdd and Vss on the PIC itself?
Is the power supply stable enough? Does it rise to +5v smoothly? Does Vpp come up to +5v before Vdd?
Do you have a 'solderless breadboard' to pull the PIC out of that circuit board and try it elsewhere?
Is the PIC installed in the correct orientation?
Members who have read this thread : 0You do not have permission to view the list of names.
Posting Permissions
Bookmarks