LS400 (93) dash illumination failiure

Hi all, Wondering who can help. Met someone who's got the following problem on a

92/93 LS-400. Instrumentation lights are permanently off. When he switches the engine on, the speedometer / revcounter indicator lines are visible for a split second (and appear to move - in the case of the rev counter), as are one or two other bits, but then the whole lot goes out and stays out. Checked all the fuses. Checked the setting of the illumination controls. FEAR it's some computer-related problem, as it's a bit like a pc mysteriously "beeping" a couple of times after being switched on. Lexus dealership is quite a few miles away, and would therefore appreciate any suggestions you may have. Arnold.
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Awvt
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Geo77777

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