Denon DSD300 - No Sound Troubleshooting

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9. No sound from Lch/Rch
Start (Chager/AMP PWB)
Check voltage 20VA (C48 & C50, 1000uF/25V)
Spec 20V±5%
Is the voltage in the spec?
Check voltage A3V3 (R72)
Spec. 3.3V±5%
Is the voltage in the spec?
Check AMP_NPDN of U4 (32pin) H?
Check AMP_NRESET of U4 (34pin) H?
Check I2S waveform (MAIN PWB)
When Function LINE IN, 1kHz 2Vrms input
Check CON4 connector (TP68, TP69, TP70)
Check CON10 connector (TP67)
Do not have problem with the I2S waveform?
Check I2S waveform (MAIN PWB)
When Function iDevice, 1kHz 0dB input
Check J1 64pin B to B connector (22pin,24pin,26pin,30pin)
Do not have problem with the I2S waveform?
Check I2S waveform (MAIN PWB)
When Function LINE IN, 1kHz 2Vrms input
Check CON4 connector (TP68, TP69, TP70)
Check CON10 connector (TP67)
Do not have problem with the I2S waveform?
Check output signal of CON3 and CON4 connector
Do not have problem with the sound waveform?
Replace speaker cable or Speaker driver unit
1. Soldering check of (Q12, R92, R93, Q10, Q15)
2. Voltage check of "V_SYS"(20V)
3. Voltage & Soldering check of (Q3, Q4, Q11)
4. Replace (U4)
1. Soldering check of (R72, U4)
2. After release (R72), conduct check (C60, C61, C62, C63,
C70)
3. Replace (R72→U4)
1. Soldering check of (U4, R58)
2. Replace (U4)
1.Soldering check of R63
2. Replace (R63→U4)
1. Soldering check of ADC circuit
2. Soldering check of DSP circuit
1. Replace CX870 module
1. Soldering check of DSP circuit
1. Soldering check of Amplier circuit
2. Replace (U4)
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
Finish