Denon AVR-S510BT Service Manual page 39

(19) Check power supply.
q Are 1.8V or 3.3V supplied to IC721 (each power supply pin)?
w Are 1.1V or 3.3V supplied to IC731 (each power supply pin)?
(20) Check xtal oscillator.
q Is there 28.6363MHz oscillation of X721?
w Is there 27MHz oscillation of X731?
(21) Check RESET.
q Is RESET waveform confirmed at IC721 (97pin)? (If reference
waveform, proceed to "YES".)
w Is RESET waveform confirmed at IC731 (115pin)? (If reference
waveform, proceed to "YES".)
(22) Check control signal(I2C).
Is waveform confirmed at Test point (SDA/SCL). (If not continued
to " L", proceed to "YES".)
HDMI output circuitry is defective (IC721/IC731 and surrounding
circuitry).
Replace the IC721/IC731.
(*1) Abnormal sample of HDMI connector : The internal terminal has bent.
YES
YES
YES
YES
NO
The power supply circuitry is defective.
q The X721 or IC721 is defective.
NO
w The X731 or IC731 is defective.
Replace the new parts.
The RESET pattern or IC721/IC731 is
NO
defective.
Replace the new parts.
NO
The SDATA/SCL line pattern is defective.
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