[Ricdiculousness]

I have a clone, with all led lights solid red, where would i start looking?

[ferrum]

If you have the next one, then this is normal and it will work in 10 seconds. If it does not start after 10 seconds, then you need to look.
If all the LEDs are red, this means that the mega16 is not working. First of all, check the power 3.3v and then the generation of quartz. In the worst case, the mega16 is faulty and can only be replaced from a donor

[____ANGEL___]

Hey ferrum i'm reworking my icom bought years ago on ali, i have changed r119 with 1k and now 256mb ok, changed y4 to 30 mhz, added r15, and now i have to check all other components, i have a question, i have measuered a 52ohm resistor and it shows 50.8 ohm at the multimeter, once soldered on the board shows 25.6 ohm that's normal?

[Matthew53]

Hey ferrum i'm reworking my icom bought years ago on ali, i have changed r119 with 1k and now 256mb ok, changed y4 to 30 mhz, added r15, and now i have to check all other components, i have a question, i have measuered a 52ohm resistor and it shows 50.8 ohm at the multimeter, once soldered on the board shows 25.6 ohm that's normal?

Probably you have another 50ohm resistor mounted there in parallel. If yes then your measured resisance of 25 ohm would be correct because two 50 ohm resistor in parallel would give 25ohm

[ferrum]

I do not understand the meaning of these measurements! There are rules and if you measure current as voltage, the same result will be.

The  is currently being sold with a lot more errors and what is written is not enough for normal operation. The photo shows 32MB chips and fixing the error will not increase the memory without replacing all 4 chips. On this board, in addition, you need to remove the flashes and fill them with firmware on the programmer

[____ANGEL___]

Hey ferrum i'm reworking my icom bought years ago on ali, i have changed r119 with 1k and now 256mb ok, changed y4 to 30 mhz, added r15, and now i have to check all other components, i have a question, i have measuered a 52ohm resistor and it shows 50.8 ohm at the multimeter, once soldered on the board shows 25.6 ohm that's normal?

Probably you have another 50ohm resistor mounted there in parallel. If yes then your measured resisance of 25 ohm would be correct because two 50 ohm resistor in parallel would give 25ohm

I was suspecting this, kirchoff law right?

---

I do not understand the meaning of these measurements! There are rules and if you measure current as voltage, the same result will be.

The  is currently being sold with a lot more errors and what is written is not enough for normal operation. The photo shows 32MB chips and fixing the error will not increase the memory without replacing all 4 chips. On this board, in addition, you need to remove the flashes and fill them with firmware on the programmer

Thanks, mine is very old, like the first single pcb.

[ferrum]

Currently sold icom next have received new errors or are these attempts to stabilize work with existing errors.
R26 100k is installed, it needs to be replaced with zero. You can use R195

[faraz]

Now in the Chinese market, 3 varieties are sold with different errors. Only one R119 error is repeated in all clones. There are clones in which the quartz is set at the correct frequency of 33000 but it has other critical errors.

Not everyone needs to change places
R292<->R293
R155<->R156
Not everyone needs
R15  52ohm
Y4  33000 3.3v
Some added other errors that are not described here.
If your icom board has R15 52ohm then this guide does not fully address the fixes that need to be done

Dear Ferrum
I have an ICOM with R15 52ohm and Y4 33000.
I changed R119 to 1k.
Swap R178<->R179.
changed R280 R285 R195 to 38k.
Changed serial to 18XXXX.
Now ICOM wont startup and just COMM LED blinks green.
If I change R119 back to 10K or remove it, ICOM startup is ok but with half memory.
What other issues should I correct?
I checked all resistors that named in first post, all correct.

[faraz]

Also I have problem on self-test, USB controller test fail.

[ferrum]

show a photo of the board from both sides


in this bank of RAM there is either a faulty microcircuit or the microcircuit contact is most likely not soldered