PIC can be read but can't be flashed.

[Guest Skipperpl]

Hi AllFirst of all, Sorry for my bad english. Here's my problemI've made a COMIII, fsdip and fscom boards. I've been able to program all PIC's but... I made Fsled board, installed with new cable (cable was faulty but I realized it a bit too late. Ok, I was not able to program fs-led, tried to progamm some of the disps once again - without success.Ok then I found that the cable was faulty (shortened two wires). I installed good cable (between com and fsled) changed PIC, and... success all was ok. Then I tried to program other pic's - no way they seemed to be death. I've bought new pic-s - they can't be flashed in any way on any board now. It's strange, I've tested voltages there is a + 4.9 on pins 12 and 13 and 13.5 v on pin 4-th and when I turn off them on fsrouter, they have 0 as required. Old PIC's can be read but I don't want to test if I can write them. Any Ideas ?RegardsPawel

[Guest yoss]

The cabel connecting FScom to serial port has to be short for flashing purposeKeep the lenght about 10cm and try flash again

[Guest Skipperpl]

Hi, Many thanks, it works now with short cable! But I shortened two cables Computer -> COM and COM -> any other PCB with PIC. But I don't understand why it worked with a long cables also !RegardsPawel

[Guest yoss]

The short cabel has to be from Fscom to rs232 com port only for flashing purpose --after that you can replace for longer oneGlad thats helped