wonder
New Member
Dear Experts
first a thanks to you all here as i could find a lot of information and already have at least a picture on the screen. But now I'm somehow stuck. As mentioned it's a clone and i did check already Power Supply (also swapped with known good one) desoldered the leaking battery (traces are still good) removed all cards - nothing. Thougth on the Bios Eprom failed and luckily found some images that should match (COPAM TD3.86 from Thomas Lao)
I read about the Supersoft Rom to diagnose - so i programmed and installed. First Success i have something on screen telling me that the 8253 Timer Channel 1 failed and Memory. I setup an Arduino to test the DRAM's (http://www.chronworks.com/DRAM/) so far all good or not that faulty as the Diag Rom tells me. Tried also to just populate Bank1 with good tested M5M4256 with no success. Not sure if i understood that correct but the Timer also is related to the Memory ? if so, it would explain that many errors.
Searching for the 8253 on the Board ... nothing but there's an MM57167AN.
Now to my question before i start to solder this one out. Could this be the one causing the Timer and Memory Failure ?
BR and thanks for any hint to bring this back to life
first a thanks to you all here as i could find a lot of information and already have at least a picture on the screen. But now I'm somehow stuck. As mentioned it's a clone and i did check already Power Supply (also swapped with known good one) desoldered the leaking battery (traces are still good) removed all cards - nothing. Thougth on the Bios Eprom failed and luckily found some images that should match (COPAM TD3.86 from Thomas Lao)
I read about the Supersoft Rom to diagnose - so i programmed and installed. First Success i have something on screen telling me that the 8253 Timer Channel 1 failed and Memory. I setup an Arduino to test the DRAM's (http://www.chronworks.com/DRAM/) so far all good or not that faulty as the Diag Rom tells me. Tried also to just populate Bank1 with good tested M5M4256 with no success. Not sure if i understood that correct but the Timer also is related to the Memory ? if so, it would explain that many errors.
Searching for the 8253 on the Board ... nothing but there's an MM57167AN.
Now to my question before i start to solder this one out. Could this be the one causing the Timer and Memory Failure ?
BR and thanks for any hint to bring this back to life