pickit3 trouble PLEASE

[Jerson]

Are you having this problem with just this one chip? Have you tried other chips to eliminate the chance of PK3 being bad?

Another thing you can try before you give up on PK3, update the firmware on the PK3.

You will find this in MPLAB->settings->configuration->manual update.

[HenrikOlsson]

Hi,
When I've had issues with PK3's they seem to all have been related to USB power supply issues.
If used on a laptop make sure you have the computer powered by the mains adapter and try another, short, high quality USB cable. Last time I had issues I had two laptops side by side, the PK3 worked fine on one of them but not on the other. Swapped the USB cable to a better one and everything's fine... (No, I was not powering my circuit "thru" the PK3, just the PK3 itself).

If you're using a desktop computer (which it sounds like you are) you could possibly try a powered USB hub.

Not saying this IS the problem but I've run into a couple of times.

/Henrik.

[l_gaminde]

Thanks Henrik and jerson maybe I have found the answer I have code protect on it has never acted this way before but once I turned it off it started working again. I have tried all your suggestions except the cable with intermittent results, I will find another cable hopefully a tad bit longer also.
Thank you both

[l_gaminde]

This is what i ended up doing installing v8.46 from a disk I had and after 15 programming tries it seams to program without errors voltage is still low out of the pickit3 and cannot be adjusted will keep you informed had verion 8.91

[l_gaminde]

After a few days no problems

[mehmetOzdemir]

Hi all,
I tried to program PIC18F1320 with 3 volt(LVP).My programmer is PICKIT 3 which i bought it from Farnell.
I activated the LVP bit on config and connected the PGM pin to PICKIT 3. When i program it with 5 volt, there is no problem, it programs with success, but i want to program it with 3 volt, it allerts " Programming failed at Program Memory address 0x000000".

Is there anybody faced this problem? Or is there any specific thing i have to do about programming pics with low voltage?

Thanks..

[l_gaminde]

do a Google search, there are three resistors that need to be done with wires in the pickit 3