Denon AVR-1912E3 Service Manual page 81

5.2. USB device is not recognized
Are you using a USB hub?
Is the USB device compatible with the set?
Is the wire properly connected between CP1 on the HDMI board and
CN104(AVR1912E3)/CN102(except the AVR1912E3) on the USB
board.
Is a voltage (5V) supplied between the pins 1 and 4 of
JACK102(AVR1912E3)/JACK101(except AVR1912E3) on the USB
board (USB connector)?
The circuitry from IC17 on the HDMI board to JACK102(AVR1912E3)/
JACK101(except the AVR1912E3) on the USB board is defective.
5.3. No picture or no sound is output
Are video signals output from IC15 pin 27 (Y) and pin 24 (C)?
Check the analog video circuit.
Are S/PDIF signals output to IC21 pin 10?
Check the Digital audio circuit.
Checking the USB device
NO
YES
Checking the set (AVR-1912/2112CI)
YES
YES
Checking the set (AVR-1912/2112CI):(If no picture is output)
YES
Checking the set (AVR-1912/2112CI):(If no sound is output)
YES
YES
Don't use the USB hub.
Only mass storage devices in FAT16 or
NO
FAT32 format or MTPcompatible devices
and iPod (Remove some models) are
supported.
NO
Connect the wire properly.
NO
The Q24 and surrounding circuitry on the
HDMI board are defective.
NO
The circuit between IC17 and IC15 is
defective.
NO
IC17 and surrounding circuitry is defective.
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