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3-1. Error Code H1-01 failure detection procedure
Checking device.
[U1039 :
MN864788]
Check the power supply voltage. (HDMI Tx)
Check item(6).
Check the power supply voltage. :
Does the power supply voltage of the HDMI Tx [U1039] indicate the correct voltage (1.1V, 3.3V)?
The test points are as follows.
HDMI Tx
1.1V
3.3V
38 pin
U1039
112 pin
YES
Check item(7).
Check the power components [U1064/U1066] and the pattern on
the substrate.
If there is no problem, remove the HDMI Switcher2 [U1039] from
the substrate and measure the voltage at the test point of
item
(6).
Is the voltage correct (1.1V or 3.3V)?
Replace with a new device.
Recheck from
If it does not work, replace the PCB.
NO
Check the power supply voltage. :
check
YES
NO
The power supply circuit is
faulty.
Replace the PCB.
check item (1).
Checking the reset waveform. (HDMI Tx)
Check item(8).
Checking the reset waveform :
Check the CPU.
Is the "RESET" waveform of the TP near the HDMI Tx [U1039]
correct (like the one shown in the diagram) when the power is
turned on?
HDMI Tx
RESET
U1039
YES
92
Examples of confirmation waveform
Voltage scale：1.0V/div
Time scale：20ms/div
NO
Check the reset circuit between
CPU [U1018] and HDMI Tx
[U1039].
If there is no problem, the HDMI
Tx [U1039] is faulty.
Replace with a new device.
Recheck from
check item (1).
If it does not work, replace the
PCB.
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