Thank you for that information!<br />
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I had to edit my previous message, because I was using wrong position names oscillators. They are X1 and X2 and their silkscreen names are under them. Possible to see them if they are socketed.<br />
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That makes sense since Warp Engine requires J100&J104 jumpers to set on EXT position, which disables A4000 motherboard U104 50MHz oscillator also divided by two in INT position.<br />
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I have been fighting dead Warp Engine for a long time and made a page to collect information about for ASSY 12-001903 version of the card:<br />
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<a href="http://relay.pp.fi/Amiga/A4000/Warp%20Engine/Warp%20Engine.html" target="_blank">http://relay.pp.fi/Amiga/A4000/Warp%20Engine/Warp%20Engine.html</a><br />
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Currently I know CPU and oscillators are ok, since they work in other type accelerators.<br />
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Would be nice to know what voltages or signals should be in test points TP1 and TP2.<br />
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Also a working dump of U52 socketed PLCC ROM would be nice, but now I am getting pretty off-topic.