Toshiba 42HL67 Service Manual - Page 12
Analog, Digital, Examples - seine
UPC - 022265000458
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No or distorted video Does NO the back light function YES normally when the unit is turned on? YES Replace the LCD display panel. Is the screen discolored NO or does it have streaks or dark areas with no signal input? Examples YES Is the on screen display NO normal? Analog Is the problem associated with an analog or digital input? Digital YES NO Suspect the Low B module. Using the power distribution diagram, are the voltages normal at P811A and P811B? YES Suspect the Seine (Digital) module. Suspect the AV tuning module. This can be confirmed by using the wiring interconnect diagram and checking the Y, Pb, Pr signals at plug CN72A. 11 Using the power distribution diagram, are the voltages normal at CN90B and CN91B? NO Suspect the Low B module.