It worked, no thumbnail but it loads on my laptop. Something is definitely wrong. Can you repeat with the Y-buffer unplugged?
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I mean for the whole buffer board to be removed, not just the connectors.
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More or less the same. So Y-main or control board is failed. Can you repeat the test on the X-main side?
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i replaced the Y-Main yesterday and my x-main has a humming sound coming from it. I checked for shorted components and found q4001 was shorted. its a RJP30E2 0712 part number. i had some new RJP30E2'S i had ordered for the old y-main board, so i replaced the shorted on on the x-main but that didn't do anything to fix the problem. so i ordered a replacement x-main.
Interesting -- definitely something appear shorted. However, I meant to test the X output. This is what goes to the orange ribbon on the righthand side.
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Can I atleast see the output? Right now I think that both X and Y are bad.
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Looks good to me. Your X-main is slightly different to my spare one -- mine does not have that diode -- but it's similar enough.
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