As much as I can see on your photo, you did not replace IC33.
Please check its checksums with an EPROM reader such as this one https://xgecu.myshopify.com/collections/xgecu-t48-tl866ii-3g-programmer
Checksum should be the same after each read. If it is not, it means the EPROM contents is altered.
Here is what I found after 20 readings on my defective one, not a single identical result :
Please check its checksums with an EPROM reader such as this one https://xgecu.myshopify.com/collections/xgecu-t48-tl866ii-3g-programmer
Checksum should be the same after each read. If it is not, it means the EPROM contents is altered.
Here is what I found after 20 readings on my defective one, not a single identical result :
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I'm waiting for IC3, other new eproms and a programmer https://www.amazon.it/gp/product/B00K2VYBC0?ref=ppx_pt2_dt_b_prod_image
I'll start by saying that I've tried the entire upper "half" of this one that I'm restoring (for me) in another fully functional Studer A730 of mine: the entire upper half works perfectly, so the problem is in the mainboard of which I've already completely renewed the power supply section.