Denon AVR-4520, Service Manual

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117
5.4. MHL
YES
YES
YES
YES
YES
YES
No picture or sound is output.
(1) Check if the MHL cable is detected.
When the MHL cable is connected, can "High” be seen for 4pin
on N1101 (8U-310116)?
(3) Check power supply (8U-310116) .
Are 3.3V supplied to N1701 5pin?
Are 1.2V supplied to N1701 6pin?
Are 5V supplied to N1101 12pin?
(4) Check RESET.
Is RESET waveform confirmed in N1101 (8U-310116) 8pin,
when the power is turned on? (If the waveform is not the
reference waveform, proceed to NO.)
(5) Check Control signal (I2C).
Is waveform confirmed in N1101 5pin/7pin (8U-310116), when
the power is turned on? (If the waveform is not the reference
waveform, proceed to NO.)
(6) Check the DDC waveform.
Can the waveform be seen for 9pin/10pin on N1101 (8U-310116)?
(2) Check the VBUS(5V) output.
When the MHL cable is connected, can "5V” be seen for 1pin on
N1701 (8U-310116)?
The MHL cable is defective.
Q804, Q805 and surrounding circuitry (8U-
310115-3) are defective.
The power supply circuitry is defective.
8U-310116
U1708 (3.3V)
U1709 (1.2V)
Q1725 (5V)
The RESET circuitry (8U-310116) or U802
(8U-310115-3) is defective.
Replace the new parts.
Q1108 (8U-310116) or the pattern is
defective of I2C line.
U800 or U802 and surrounding circuitry (8U-
310115-3) are defective.
U1707 and surrounding circuitry (8U-
310116) are defective.
NO
NO
NO
NO
NO
NO
Please refer to the "AVR4520_HDMI Rx-Tx Failure Detection
Procedure Manual ver_1.00" of SDI.