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OK, so put in the 3 caps on the SMPS board, and now both outputs on the SMPS (+24 and +16) are good. Still no pix, though.
Backlight comes up, and 2 SMD leds on the main board light up steady green.
All the lower operating voltages (+12, +5, +3.3, etc.) are derived from the +16 rail via multiple DC/DC converters and regs on the main "scaler" board. What should be a +12V rail is putting out +16V.
Will try substituting an external +12 for further testing. The +12V appears to be derived from +16 by a L5973 buck regulator chip. Chip appears to be internally shorted from Vin to Vout. Will stick one in next parts order.
Couple SMD electrolytics on main board seem a little bulged or are running warm. Will replace.
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06-04-2013, 10:11 PM
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