No Sound, Noise Generated - Denon DNP-720AE Service Manual

3. No Sound, Noise generated

3.1. Tuner
Check the Power Supply Voltages for AM/FM TUNER.
MAIN B'D
• +9V_TU, [CP104] : 8pin
Check the Audio Data output from TUNER PACK.
MAIN B'D
• AINR, [IC115] : 1pin
• AINL, [IC115] : 2pin
Check the Power Supply Voltages for ADC.
• +3.3V_D1, [IC115] : 7, 14, 15pin
• +5V_A, [IC115] : 6pin
Check the Reset signal for ADC.
• A/D Reset, [IC115] : 13pin
Check the communication signal for ADC.
• A/D LRCK, [IC115] : 10pin
• A/D MCLK, [IC115] : 11pin
• A/D BLCK, [IC115] : 12pin
Check the audio serial data for DIR.
MAIN B'D
• A/D DATA, [IC112] : 24pin
d
YES
YES
YES
YES
YES
YES
A
Check the voltage of each part.
MAIN B'D
1. [IC117] : 4pin
NO
2. [Q112] : 2pin (base) ("H" : OK)
3. [IC100] : 1pin
4. [Q100] : 2pin (base) ("H" : OK)
SMPS B'D
5. [J1] : 1pin
Check the waveform of each part.
NO
MAIN B'D
1. AINR, [CP104] : 7pin
2. AINL, [CP104] : 5pin
Check the voltage of each part.
MAIN B'D
1. [IC106] : 1, 2pin
NO
2. [IC101] : 1pin
3. [IC100] : 1pin
4. [Q100] : 2pin (base) ("H" : OK)
SMPS B'D
2. [J1] : 1, 7pin
NO Check the waveform of each part.
MAIN B'D
1. [IC113] : 64pin
Check the waveform of each part.
NO
MAIN B'D
1. [IC112] : 22, 23, 27pin
NO
Check the waveform of each part.
MAIN B'D
1. [IC115] : 9pin
21