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Black screen but not TIA problem


Blackgear
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Hi all.

My 2nd light sixer, a Sunnyvale this time, arrived at home. It is affected by black screen problem. So I used the psu of the first 2600 I own, which works perfectly.

Nothing changed.

I've put the sunnyvale's TIA on the working 2600.. Black screen on it.

Placed the working 2600 Tia on the Sunnyvale.. Black screen. Sometimes shows colored vertical lines. I've try to Reinsert the CPU and the other chip.. Nothing. The voltage regulator put its 5v on the board, and 5v arrive on the connector of the shielded board too.

Suggestions? May I swap all chips from the working 2600 to the Sunnyvale?

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