pickit2

[JARI_NETWORKS]

Hi, i am new here and have a big problem i think.

i have a pic programmer, the pickit2, but now after i have don't use a long time,
the programmer don't recognizes the pic-chip 16F877A.
i have tried out 10 pieces, but none of them seems to work anymore.
When i put a 16F628A on that place, there is no any problem.

Does anyone can tell me what the problem can be??

 

[Ian Rogers]

Can I see your programming board.. please.. If you're using a zif socket the outside edges may be dirty..

 

[JARI_NETWORKS]

first i used a zif socket, after that i put it straight on a breadboard, it is strange that it is only with the 877a

 

[Ian Rogers]

Well! the though behind it was that they are both on different pitch .3 and .6 (the 877a is wider) its the only thing I can see that's different.

 

[JARI_NETWORKS]

yes, so that can't be the problem i think,
but do the 877a have the same program power as the 628a or is that differant

 

[Mickster]

PIC16F877A has VDD on pins 11 & 32, VSS on 12 & 31.....are you using both sets of pins?

 

[JARI_NETWORKS]

yes, use the both and even the C over the power
i have programmed more pics 877a, but
4 days ago i get the problems

 

[Mickster]

Are the 16F877A's new or previously used?
Are you using MPLABIDE or the standalone PICkit2 application and which version?
Are you getting a specific error message, or a "No device detected" type of message?
Have you tried the PICkit2 troubleshooting wizard in the standalone app?

EDIT: There was a post on the Microchip Forum some time ago, which mentioned dropping the voltage down from 5V.
Just had a look, but I can't seem to find it.

 

[JARI_NETWORKS]

the pics 877a are both new and used
most of the time i get the error "No device detected"
sometimes the error that the vdd is to low
stand alone, version 2.61

 

[Mickster]

Have you tried the troubleshooting step?
Additionally, has any change to your programming setup taken place 4 days ago, i.e. PC system restore, update to standalone version, etc.
Are you able to use someone else's PICkit2 to compare against your own?
How long are your programming cables?

 

[JARI_NETWORKS]

cables are just 10 cm
tried the troubleshooting, seems ok
not be able to compair with someone else
and no changes in the programming setup

 

[Ian Rogers]

Again.. I mentioned this in another thread... Just check the programming voltage on the interface.. I always set it to 5v but for some reason it was showing 4v.

 

[JARI_NETWORKS]

Again.. I mentioned this in another thread... Just check the programming voltage on the interface.. I always set it to 5v but for some reason it was showing 4v.

in my case, and in the troubleshoot, it was 4.9 volt

EDIT, i have just ordered a new pickit2

 

[JARI_NETWORKS]

its okay now

 

[DerStrom8]

in my case, and in the troubleshoot, it was 4.9 volt

EDIT, i have just ordered a new pickit2

its okay now

The old one is okay, or is it only working because you got a new one?
My guess would be that the connectors were just dirty. Either that or something was connected incorrectly (or not connected at all).
Glad it's working, anyway.

Der Strom

 

[JARI_NETWORKS]

till now, i did not tried the old one, maybe later i will