Denon AVR-1912E3 Service Manual page 72

(8) Check the input signal
Is each waveform confirmed with the following terminal of IC12?
2pin : 1TXVSYNC
79pin : 1TXPCK
97pin : 1TXDE
98pin : 1TXHSYNC
(If the waveform is not the reference waveform, proceed to NO.)
Check operation of IC12(ADV7511)
(9) Check power supply.
Are 1.8V or 3.3V supplied to IC12(each power supply pin)?
(10) Check RESET.
Is RESET waveform confirmed in IC12 (38pin), when the power
is turned on? (If the waveform is not the reference waveform,
proceed to NO.)
(11) Check output signal.
Is TMDS waveform confirmed at IC9(112pin/113pin/115pin/116pi
n/118pin/119pin/121pin/122pin).
(If the waveform is not the reference waveform, proceed to NO.)
Check operation of IC9(ADV7623)
(12) Check power supply.
Are 1.8V or 3.3V supplied to IC9(each power supply pin)?
(13) Check xtal oscillator.
Is oscillation of XTAL1(28.6363MHz) transmitted?
(14) Check RESET.
Is RESET waveform confirmed in IC9 (97pin), when the power
is turned on? (If the waveform is not the reference waveform,
proceed to NO.)
The pattern and circuit from the HDMI connector (JACK6) to the
IC(IC9) are defective, or HDMI output circuitry is defective (IC9 and
surrounding circuitry).
YES
YES
YES
YES
YES
YES
YES
NO
The U4 is defective.
NO
The power supply circuitry is defective.
The RESET circuitry (Q22 and surrounding
NO
circuitry) or IC12 is defective.
NO
The IC12 is defective.
NO
The power supply circuitry is defective.
NO
The XTAL1 or IC9 is defective.
The RESET circuitry (Q18 and surrounding
NO
circuitry) or IC9 is defective.
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