|
|
Post by tibimakai on Jan 20, 2019 23:10:52 GMT -5
I have cleaned up and straightened the pins, on the original Micon. Ready to ship it to you.
The PCB traces are usable. Some are missing(two of them are N/C, got lucky), but I will manage to make it work.
I will have to get another Onkyo, or contact that person from Alibaba. Do you have that site's address, by any chance?
|
|
|
|
Post by tibimakai on Jan 20, 2019 23:50:30 GMT -5
I have measured on the original Micom, between pin #9 and #11 and there is no short. Value is in mega ohms. That is good news.
|
|
|
|
Post by tjmotter on Jan 21, 2019 17:20:58 GMT -5
Acetone might damage the board. There are likely traces under there. If you have a small hobby iron (used on model airplanes) you might try to lay it on top of the chip for a couple of minutes and then try to pry (gently) on it to see if it will release.
|
|
|
|
Post by tjmotter on Jan 21, 2019 17:22:37 GMT -5
I have cleaned up and straightened the pins, on the original Micon. Ready to ship it to you. The PCB traces are usable. Some are missing(two of them are N/C, got lucky), but I will manage to make it work. I will have to get another Onkyo, or contact that person from Alibaba. Do you have that site's address, by any chance?
|
|
|
|
Post by tibimakai on Jan 22, 2019 11:18:19 GMT -5
Thanks Todd. I have sent a price request.
|
|
|
|
Post by tibimakai on Jan 23, 2019 11:24:41 GMT -5
|
|
|
|
Post by tjmotter on Jan 23, 2019 13:53:37 GMT -5
I ended up cutting the two traces(+7V and -7V) and the voltages went up to +/-6.94V. To me, this way it seemed like the easier route. I will clean the green stuff up and resolder the two traces. I went with the dremel at it. Forgot that you have mentioned, to solder all pins together, my bad. Will cost me some tedious repair. Luckily I have a scope now. Managed to rip a few traces, when I was removing the legs with the solder iron, or when I used the dremel. Only think left is, to pry up the IC. Could I use some kind of Acetone, or something that would melt the glue? It definitely looks like this was the source of the issue. Unfortunate but at least you are making progress! |
|
|
|
Post by tibimakai on Feb 7, 2019 11:03:51 GMT -5
Mastertech, I have a question for you. You are a repair technician? You wouldn't have access to this receiver's Micom, or it's software? Or even repairman, are just getting the whole board as a replacement?
|
|
|
|
Post by mastertech on Feb 8, 2019 11:27:18 GMT -5
Mastertech, I have a question for you. You are a repair technician? You wouldn't have access to this receiver's Micom, or it's software? Or even repairman, are just getting the whole board as a replacement? Authorized service repair centers for specific brands sometimes get information not available to outsiders. But even this info usually ends up getting released, but not always. Your question would be best asked to an Onkyo authorized repair center but they may not answer you truthfully either. I have seen pre programmed mcu available for purchase for some receivers in the past but rarely seen programming software/hardware. |
|
|
|
Post by tibimakai on Feb 8, 2019 11:32:55 GMT -5
I'm OK buying the programmed MCU. Todd has a programmer, we just need the software. I'm OK going both ways.
I'm pretty certain, that the receiver will work after I replace Q4001.
I will look into an authorized repair center, and see what they will say.
|
|
|
|
Post by tibimakai on Feb 27, 2019 11:33:47 GMT -5
I have soldered in Q4001, came out really good. Some traces are loose, but they are soldered to the correct pins.
I just need to find two 22 Ohm resistors, because the last ones are burned.
|
|
|
|
Post by tjmotter on Feb 27, 2019 17:05:57 GMT -5
GREAT job!
|
|
|
|
Post by tibimakai on Feb 28, 2019 11:10:10 GMT -5
I have found some 47 Ohm ones. Should I just soldered them, on top of each other? It would be 23.5 Ohm, right?
These are the +/-7V supply resistors.
|
|
|
|
Post by tjmotter on Mar 1, 2019 8:39:36 GMT -5
I have found some 47 Ohm ones. Should I just soldered them, on top of each other? It would be 23.5 Ohm, right? These are the +/-7V supply resistors. yes, soldering the two in parallel would be 23.5 ohms. You could try this as a short term fix. |
|
|
|
Post by tibimakai on Mar 1, 2019 11:23:35 GMT -5
You have asked me a couple of days ago, if I don't have some pins shorted at the Micom, and I can say, that I don't have any short. I have a microscope now.
My problem with this type of components is, that I'm not sure, if all the pins are actually soldered to the board and making good contact.
I'm going over and over when I'm soldering, but what is interesting, that eventually I can still find some, that are still loose. I poke them with a needle, to see if they are still free or not.
|
|
