Acer ACER ASPIRE 5236 5536 5536g WISTRON JV50-PU 08252

hi guys, we replaced 216-0674026 with 216-0674022 on Acer 5536 and checked the BIOS dump (OPROM00.ROM) for RS780 and it is correct but still no image. Can this 216-0674022 substitute 216-0674026 with modded BIOS?
 
before there were artefacts now there is no image but 216-0674026 with 216-0674022 are compatible when they serve only as Northbridge. When the Integrated graphics are used there might be a problem or need modded BIOS. We use Finetech FINEPLACER PICO RS to replace or reball BGAs (we have done hundreds :DD) and so we are sure that the BGA is placed correctly.
 

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