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BMW Icom A2 repair
23-09-2022, 14:54 PM,
Post: #141
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RE: BMW Icom A2 repair
Most likely, the processor balls are torn off and your actions when replacing the flash restored contact, but this is not for long
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29-09-2022, 15:21 PM,
Post: #142
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RE: BMW Icom A2 repair
Good afternoon, I have an icom A2, which has stopped working. The leds do not light up.
I have checked the voltages on the components: 46V3216 I have 3.10 volts KSZ8893MQL I have 3.24 volts Atmel 16L I have 3.24 volts ISP1562BE I have 3.24 volts S29GL064A11TFIR2 I have 3.24 volts K9F2G08U0BPCB0 I have 3.24 volts According to what I have seen in the datasheet of the 46V3216 component, they work at 2.5 volts. I'm trying to look on the board where that power comes from and I can't find it. If someone can help me please I would appreciate it. Best Regard |
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29-09-2022, 23:47 PM,
Post: #143
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RE: BMW Icom A2 repair
Divider R101 R102 feedback regulates voltage 2.5v
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30-09-2022, 11:00 AM,
Post: #144
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RE: BMW Icom A2 repair
good morning
Could you tell me the resistance values of: R101 = ? R102 =10K Best Regard |
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30-09-2022, 14:14 PM,
Post: #145
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RE: BMW Icom A2 repair
resistance R101 22kom
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30-09-2022, 15:35 PM,
Post: #146
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RE: BMW Icom A2 repair
Hello
I have checked resistor R101 and I have 22k ohms. Resistor R102 is 10k ohms. In the resistor R101 at one terminal I have 3.1V and it produces a voltage drop of approximately 2.21 volts, at the output of the resistor I have 0.80 that go to R102 which has 10K and derives to ground. I check the pin of R101 that I have 3.1V and I have continuity with pin 1 of the integrated 46V32M16. I have checked the voltage at C44 and R11 and indeed I have 2.5V. Pin 1 of the integrated 46V32M16 gives me continuity with the choke coil 3R3. I don't understand where the problem could be. It is as if the design of the board was designed so that the integrated 46V32M16 would work at 3.1V. |
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30-09-2022, 23:07 PM,
Post: #147
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RE: BMW Icom A2 repair
I don’t understand the logic of your actions and it’s certainly not the voltage on the RAM, the processor will start even if there is no voltage on the RAM
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05-10-2022, 09:28 AM,
Post: #148
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RE: BMW Icom A2 repair
good morning
Sorry for the previous message, the multimeter marked me wrong. Resistor R101 has a 27k resistor, I replaced it with a 22K resistor and now pin 1 of the 46V32M16 chip has 2.55 volts. One of the 46V32M16 memories is internally shorted. I can indicate that with the 46V32M16 memories removed, the icom does not illuminate any LED I have bought 4 new 46V32M16 memories and I am waiting for them to arrive to put them on. Thank you very much Ferrum for the help provided. |
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14-10-2022, 16:03 PM,
Post: #149
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RE: BMW Icom A2 repair
Hello, I sent my A2 PCB for MCU reball.
Wheni received it back, no LEDs were on, when i powered it up. I found out broken fuse on bigger PCB. After replacement burned component circled on the picture. I borrowed this picture from this thread. I have Wifi card connector above this component. PCB had some flugs residue on this side. I cleaned it later. My bad. |
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31-10-2022, 10:53 AM,
Post: #150
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RE: BMW Icom A2 repair
Hi guys , today I have conected my Icom a2 to a car and there was no leds turning at all it was working yust fine for 7 years until this day.. I open it , make quick visual inspenction but nothing obvius was faund..also cheked some smd fuses that I find but none of them looks blown.. I hope someone can point me what else could I chek bofere I throw it out...
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