Electronics > Repair

What more i can do?

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222Lab_Test222:

--- Quote from: Swake on December 26, 2024, 09:02:04 am ---Forget about OSC3 for the moment. Reason: It is a 2.4576 MHz Crystal and that frequency is a very standard one used for UART purposes. Probably nothing to do with the Wacom Tornado ship or anything that starts the board.

--- End quote ---
Not only that OSC, all other OSC has voltage similiar to 2V

Swake:

--- Quote ---The connector layout and functionality may differ from the standard applicable

--- End quote ---

Maybe, however everything I could check against the 'standard' is exactly as in 'normal' designs. The SRAM picture shows a SIMM with normal layout and the identification tab is in the right place. My believe is that the design of these boards is not using tricks. But again, I'm not an expert here.

We can doubt the placement of the SRAM vs FRAM SIMMs, or doubt that those SIMMs are still working as expected. But 222Lab_Test222 has at least one working board and from what I understand it is confirmed these SIMMs and also the ROMs are functional and in the right place.

I trust 222Lab_Test222 has not mixed up good and bad boards and SIMMs. Anyhow in case of doubt it is easy to startup a 'good' board and confirm all those component are still ok.

222Lab_Test222:

--- Quote from: Swake on December 26, 2024, 07:50:54 am ---I assumed from previous posts that all failing boards are failing in the same way, that seems to point to a single type of failure, but maybe this is sand in the eyes and there are several different causes and potentially also boards with more than one issue.

--- End quote ---
Yeah from what i have gather info from all of you guys and from other resources, I think the main issues of beep is BIOS. If BIOS is performing ok then there is no beep.

But there are lots of causes for BIOS to not working, sometimes IC failure, maybe poor joints or capacitor, there are too many things that may cause issues to this BIOS.
Also if the volatge provide to motherboard is less tha  4.5V, there is also beep, also it maybe be due to BIOS again as there is no sufficient voltage for BIOS to perform.

222Lab_Test222:
SIM 2 is Flash RAM
SIM 1 is DRAM or SRAM

If i interchange this, even the working board doesnt work.

m k:

--- Quote from: 222Lab_Test222 on December 25, 2024, 11:04:53 pm ---
--- Quote from: m k on December 25, 2024, 03:43:28 pm ---
How did you do it exactly, put low ROM to high socket and high ROM to low socket?

--- End quote ---
Yes like that.

--- End quote ---

Why did you scope only half of the data?

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