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Check operation of U1601.
(30) Check power supply.
Is 1.2V supplied to C1632?
Is 3.3V supplied to C1656?
(31) Check RESET.
Is RESET waveform confi rmed in N1601 (1pin), when power is
turned on? (If continued to "H" or " L", proceed to "NO".)
(32) Check output signal.
Is waveform confi rmed in R1643(1TXDE/1TXVSYNC/1TXHSYNC/
1TXPCK). (If not continued to " L", proceed to "YES".)
Check operation of U1801.
(33) Check power supply.
Are 1.8V or 3.3V supplied to U1801 (each power supply pin)?
(34) Check RESET.
Is RESET waveform confi rmed in U1801 (38pin), when power is
turned on? (If continued to "H" or " L", proceed to "NO".)
(35) Check output signal.
Is TMDS waveform confi rmed in 32pin/33pin/35pin/36pin/39pin/40
pin/42pin/43pin (U1801) ? (If continued to "H" or " L", proceed to
"NO".)
Is waveform confi rmed in 53pin/54pin (U1801) to DDC_SCL/DDC_
SDA.
(If continued to "H" or " L", proceed to "NO".)
The pattern and circuit from the HDMI connector (N1800/N1801) to
the IC(U1802/U1803) is defective, or HDMI output circuitry is defective
(U1802/U1803 and surrounding circuitry).
YES
YES
YES
YES
YES
YES
NO
The power supply circuitry is defective.
NO
The RESET circuitry (Q1600 and
surrounding circuitry) or U1601 is defective.
NO
The U1601 is defective.
NO
The power supply circuitry is defective.
NO
The RESET circuitry (Q1801 and
surrounding circuitry) or U1801 is defective.
NO
The U1801 is defective.
50
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