Toshiba 42HL67 Service Manual - Page 14
Analog, Digital
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UPC - 022265000458
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No or distorted Audio Digital Is problem associated with analog or digital inputs? Analog Using the power YES distribution diagram, are NO the voltages normal at CN90A and CN91B? Using the power NO distribution diagram, YES are the voltages normal at P812A and P812B? Suspect the digital module. This can be confirmed by using the wiring interconnect diagram and an oscilloscope and checking the right and left audio signals at CN71. Suspect the Low B module. Suspect the Tuner module. 13
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Is
problem associated
with analog or digital
inputs?
NO
YES
Analog
Digital
Suspect the
Tuner
module.
Using the power
distribution diagram,
are the voltages normal
at P812A and
P812B?
Suspect the
Low B
module.
Using
the power
distribution diagram, are
the voltages normal at
CN90A and
CN91B?
NO
YES
Suspect the digital module.
This
can be confirmed by using the wiring
interconnect diagram and an oscilloscope
and checking the right and left audio
signals at CN71.
No or distorted
Audio
13
13