Electronics > Repair
What more i can do?
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222Lab_Test222:

--- Quote from: Harry_22 on November 07, 2024, 05:43:06 am ---
--- Quote from: 222Lab_Test222 on November 06, 2024, 11:19:34 pm ---
10. Remove SIM1 (Dram). Switch on the computer and check for beep. Switch it off. Install both SIMs back.
-There is no beep at all, BUT the screen is black although it is on and i see 1 or 2 unknown letters.
11. Remove IC40 (CGROM3). Switch on the computer and check for beep.
-I am not sure how to remove this, shall i desolder?

--- End quote ---

What about the screen on non-working PC? Is it also on? Please check.

Don't remove IC40. Sorry, I didn't see that there is no bed underneath.

Please do the following on working machine:
Remove Sim1 (Dram) and try to start it.

PS
Every time before a new manipulation, check that the machine is working.

--- End quote ---

After you requested, i am performing all tasks in working machine.

In non working board screen, after i press on, It keeps beeping continuously, i do not see anything on the screen. It feels like screen is not even on.

When SIM 1 is removed, Its just some blank screen. BUT if i swap SIM 1 and SIM 2 in same working board *the same board* there is beep, and if i just plug it out there is no beep. Its weird.

Harry_22:

--- Quote from: 222Lab_Test222 on November 07, 2024, 07:29:32 am ---
After you requested, i am performing all tasks in working machine.

In non working board screen, after i press on, It keeps beeping continuously, i do not see anything on the screen. It feels like screen is not even on.

When SIM 1 is removed, Its just some blank screen. BUT if i swap SIM 1 and SIM 2 in same working board *the same board* there is beep, and if i just plug it out there is no beep. Its weird.

--- End quote ---

Do you mean here "non-working"?

Could you perform the detailed description of Sim manipulation test on both working and non-working machines.

PS
Your board is as an alien artifact from a moon-digging machine. :)
Now we're looking for some thread to grab onto and unravel the tangle further.
222Lab_Test222:

--- Quote from: Harry_22 on November 07, 2024, 09:11:56 am ---
Could you perform the detailed description of Sim manipulation test on both working and non-working machines.


--- End quote ---

SIM Manipulation
1. Working Board
- When SIM 1 is removed there is just black screen.
- When SIM 2 is removed there is some texts like date stuffs time on screen.
- When I swap SIM 1 and SIM 2, i mean put SIM 1 in SIM 2 and vice versa, there is beep.

2. Non Working Board
- There is beep, even i remove SIM 1 or SIM 2, I can't get the screen turn on.
- Same even if i swap, no screen turn on, Only Beep.
222Lab_Test222:

--- Quote from: Harry_22 on November 07, 2024, 09:11:56 am ---
PS
Your board is as an alien artifact from a moon-digging machine. :)
Now we're looking for some thread to grab onto and unravel the tangle further.

--- End quote ---

If we can get hands on WACOM IC datasheet, then we can solve lots of issues BUT nope no datasheet.
Harry_22:
Could you remove both UV-EPROMs with DOS on working board and check it for beep.
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