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 [IC381] indicate the correct voltage (1.1V)?
The test points are as follows.
HDMI SW2
IC381
112 pin
1.1V
Check item(3-3.2.). Check the power supply voltage. :
Check the power components [IC120/IC113] and the pattern on the
substrate.
If there is no problem, remove the HDMI SW2 [IC381] from the sub-
strate and measure the voltage at the test point of check item (3-
3.1.).
Is the voltage correct (1.1V or 3.3V)?
Replace with a new device.
The power supply circuit is
faulty.
Replace the PCB.
Recheck from check item (3.1.)
If it does not work, replace the PCB.
Checking device. [IC381 : MN864788]
3-3. Error Code H1-03 failure detection procedure
NOYES
NOYES
Checking the reset waveform. (HDMI SW2)
Check item(3-3.3.). Checking the reset waveform :
Check the waveform.
Is the "TP19" waveform of the TP near the HDMI SW2 [IC381]
correct (like the one shown in the diagram) when the power is
turned on?
HDMI SW2
IC381
TP19
Check the reset circuit between
CPU [IC151] and HDMI SW2
[IC381].
If there is no problem, the HDMI
SW2 [IC381] is faulty.
Replace with a new device.
Recheck from check item (3-3.3.)
If it does not work, replace the
PCB.
NO
Examples of conî™°rmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
check item (3.1.) again after replacing [R3812/R3814] with a new
resistor.
If there is still a problem, the HDMI SW2 [IC381] is faulty.
Replace with a new device.
Recheck from check item (3.1.)
If it does not work, replace the PCB.
YES
Before Servicing
This Unit
Electrical Mechanical Repair Information Updating
111
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