72
YES
YES
Check operation of U1801.
(34) Check RESET.
Is RESET waveform conrmed in U1801 (38pin), when power is
turned on? (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).
(33) Check power supply.
Are 1.8V or 3.3V supplied to U1801 (each power supply pin)?
The RESET circuitry (Q1801 and
surrounding circuitry) or U1801 is defective.
The power supply circuitry is defective.
NO
NO
YES
YES
Check operation of U1601.
(31) Check RESET.
Is RESET waveform conrmed in N1601 (1pin), when power is
turned on? (If continued to "H" or " L", proceed to "NO".)
(30) Check power supply.
Is 1.2V supplied to C1632?
Is 3.3V supplied to C1656?
The RESET circuitry (Q1600 and
surrounding circuitry) or U1601 is defective.
The power supply circuitry is defective.
NO
NO
YES
(32) Check output signal.
Is waveform conrmed in R1643(1TXDE/1TXVSYNC/1TXHSYNC/
1TXPCK). (If not continued to " L", proceed to "YES".)
The U1601 is defective.
NO
YES
(35) Check output signal.
Is TMDS waveform conrmed in 32pin/33pin/35pin/36pin/39pin/40
pin/42pin/43pin (U1801) ?
(If continued to "H" or " L", proceed to
"NO".)
Is waveform conrmed in 53pin/54pin (U1801) to DDC_SCL/DDC_
SDA.
(If continued to "H" or " L", proceed to "NO".)
The U1801 is defective.
NO
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