What voltage do you have as Vpp?ech said:U1 & R3 are still getting hot after plugged. ( even the parts around u1 ( L2, C2, C3, C4) are a little warm)
If the U1 is socketed, you can try to remove it and try the self test again. It will fail because of Vpp, but the rest should be fine.MPLAB can connect to the ICD but after +/- 5s, I get a dialog box saying that mplab lost the communication. ( with a question, would you like to reconnect..)
The self test hangs..
I guess it's called shielding.Some more info: I don't have any usb plug so I cut an usb cable and soldered the wires directly on the pcb... I also soldered the ground "blindage" ( sorry, I don't know the english word for the ground wires around the cable) on the pcb .
What voltage do you have as Vpp?ech said:U1 & R3 are still getting hot after plugged. ( even the parts around u1 ( L2, C2, C3, C4) are a little warm)
If the U1 is socketed, you can try to remove it and try the self test again. It will fail because of Vpp, but the rest should be fine.MPLAB can connect to the ICD but after +/- 5s, I get a dialog box saying that mplab lost the communication. ( with a question, would you like to reconnect..)
The self test hangs..
I guess it's called shielding.[/quote]Some more info: I don't have any usb plug so I cut an usb cable and soldered the wires directly on the pcb... I also soldered the ground "blindage" ( sorry, I don't know the english word for the ground wires around the cable) on the pcb .
100uH should be brown-black-brown-something.ech said:L2 ( Brown, Black, silver, silver)
z01z said:100uH should be brown-black-brown-something.ech said:L2 ( Brown, Black, silver, silver)
What voltages do you have on all pins of U1?
Pin 5 should be 1.25V if the circuit works properly. Also, pin 6-8 should be around 5V. Seems like the IC is trying to generate the output voltage but it cannot. I'd say first try to replace the inductor.ech said:pin 1: 4.87 V
pin 2: 0
pin 3: 2.14
pin 4:0
pin 5: 0.6
pin 6:4.96
pin 7:4.85
pin 8: 4.37
It's a 10uH inductor. If you don't need the modem anymore, you can give the inductor a try, it might be enough (or at least works better than the current one).Unfortunately I don't have any other inductance is stock exepct for one soldered on an old pc phone modem. ( Brown, Black, Black, silver)
You'd better get a correct inductor instead of changing anything else.Would it be possible to adapt other parts to reach 12.5V on vpp ???
Do you still have the Microchip device listed among the USB devices after the disconnect?I tried running the self test without the MC34063A but it didn't succeeded...
I'm still wondering what could make the icd disconnect after a few seconds .....
Ludovic LANGE said:Hello all,
What are the intensity / amperage requirements for Vpp ?
Do you want me to hold magnifying glass for youMike said:... not sure these old eyes and fat fingers can work with those TQFP packages
Hey, do not lie every one. Do you really drive your ICD2 well , hehe!batbatdieu said:Hi , finally my ICD2 is working , it's so cool .
manu said:Ludovic LANGE said:Hello all,
What are the intensity / amperage requirements for Vpp ?
Few mA only.
MAX662A is a good one, but it's relativiously expensive, try TPS6734 from ti !
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