The detection switch power supply side no output, no standby voltage. The machine uses all switch power supply design, power points and three groups. A group is standby voltage of 5 volts, the second group was plus or minus 15 V and 30 V screen display voltage, the second set of chip oscillator powered by each group sampling, after the third set of positive and negative 45 volts voltage by the second group sampling. Will power normal after the repair only to find the normal picture, the total signal no sound. IC2103 when the analog signal2CEservice manual download site
Fiftieth foot DSP1-RST output of the reset signal is intermittent flashing, the HDMI signal when the reset signal normal, the speaker has a small noise, can not distinguish the sound of the music.2CEservice manual download site
According to experience decided to use the analog input signal to maintenance and access analog in2. In IC2201 29, 30 foot found the input signal, after the chip switching from 38, 39 feet, 1905 two op amp processing of output supply IC1904 sent to IC1901 cs42528 13, 14, 15, 16 feet as the DAC signal source.2CEservice manual download site
When the signal has normal input. The analog signal from the chip and DSP circuit will be as loud as the sound effect processing and from the 20 foot ---37 feet total output 8 channels (including bass is 7.1), which the 34, 35, 36, 37 feet as R and L channel output, circuitry drawing marker for: D D_FR+ / FR / D /D_FL+/ D fr measured the four foot bit found no signal output (normal working voltage measure, reset and the data, after the replacement voice). This part of the circuit on page 177. The four main channel signal by op amp IC2202 amplified from the pin 1 and pin 7 output.2CEservice manual download site
It back to IC2201 CVINJU72340AFH20 from 41, 42 pin input, used as a volume adjusted from 1, the pin 2 of the output VOL-R/VOL-L, further enlarged by the op amp IC2217, then generated for the next stage amplifiers in the first level signal.2CEservice manual download site