Denon AVR-X4100W Service Manual page 111

Can a voltage (5V) be confirmed between pin 2 and pin 5 of
CN903?
Can an output voltage (3.3V) to IC112
be confirmed?
Can an output voltage (3.3V) to
Q1107(FET_SW) be confirmed?
Can an output voltage (1.2V) to IC115
be confirmed?
Can an output voltage (1.9V) to IC116
be confirmed?
Are the versions of the Ethernet SBL and IMG displayed in Version
Check Mode?
The circuit around CX870 is faulty.
YES
NO
Is D5V_POWER (IC151 uCOM 85pin)
"Hi" ?
YES
NO
Is E_POWER1 (IC151 uCOM 53pin) "Hi"
?
YES
NO
Is E_POWER4 (IC151 uCOM 56pin) "Hi"
?
YES
NO
Is E_POWER2 (IC151 uCOM 54pin) "Hi"
?
YES
YES
NO
The circuit between the AC inlet and CN903
is faulty. Check the SMPS PCB.
NO
YES
NO
YES
NO
YES
NO
YES
NO
The Ethernet software is faulty.
111
The circuit of D5V_POWER between
IC151 and IC112 are faulty.
The circuit around IC112(DC-DC.Conv.)
is faulty.
The circuit of E_POWER1 between
IC151 and Q1107 are faulty.
The circuit around Q1107(FET_SW) is
faulty.
The circuit of E_POWER4 between
IC115 and IC115 are faulty.
The circuit around IC115(DC-DC.Conv.)
is faulty.
The circuit of E_POWER2 between
IC151 and IC116 are faulty.
The circuit around IC116(DC-DC.Conv.)
is faulty.