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3-3. Error Code H1-03 failure detection procedure
Checking device.
[U2601 :
MN864788]
Check the power supply voltage. (HDMI SW2)
Check item(3-3.1.).
Check the power supply voltage. :
Does the power supply voltage of the HDMI SW2 [U2601] indicate the correct voltage (1.1V)?
The test points are as follows.
HDMI SW2
112 pin
U2601
YES
Check item(3-3.2.).
Check the power components [U3605/U3601] and the pattern on
the substrate.
If there is no problem, remove the HDMI SW2 [U2601] from the
substrate and measure the voltage at the test point of
(3-3.1.).
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 item
YES
NO
The power supply circuit is
faulty.
Replace the PCB.
check item (3.1.)
Checking the reset waveform. (HDMI SW2)
Check item(3-3.3.).
Checking the reset waveform :
Check the waveform.
Is the waveform of the TP near the HDMI SW2 [U2601] correct (like
the one shown in the diagram) when the power is turned on?
HDMI SW2
RESET
U2601
YES
check item (3.1.)
again after replacing [R2630/R2631] with a new
resistor.
If there is still a problem, the HDMI SW2 [U2601] is faulty.
Replace with a new device.
Recheck from
check item (3.1.)
If it does not work, replace the PCB.
105
Examples of confirmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
NO
Check the reset circuit between
CPU [U6201] and HDMI SW2
[U2601].
If there is no problem, the HDMI
SW2 [U2601] is faulty.
Replace with a new device.
Recheck from
check item (3-3.3.)
If it does not work, replace the
PCB.
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