I had a similar problem with a broken oscillator on one OSSC (backlight stayed lit, but no signs of life from the LCD or the unit itself)… and with a solder bridge on the TVP7002 (U1) on another OSSC (backlight slowly faded with nothing on the LCD).
Sometimes a solder bridge is hard to find – even with a microscope. You can try to find a solder bridge under one of the ICs the hard way, by checking adjacent pins for continuity with a multimeter under the microscope (but keep in mind: there may be some grounded pins next to each other).
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