Check the power supply voltage. (HDMI Tx)
Check item(3-1.1.).
Check the power supply voltage. :
Does the power supply voltage of the HDMI Tx [
U3401
] indicate the correct voltage (1.1V, 3.3V)?
The test points are as follows.
HDMI Tx
U3401
162 pin
R3438
1.1V
3.3V
Check item(3-1.2.).
Check the power supply voltage. :
Check the power components [
U3606/U3601
] and the pattern on
the substrate.
If there is no problem, remove the HDMI Tx [
U3401
] from the sub-
strate and measure the voltage at the test point of
check item (3-
1.1.)
.
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. [
U3401 : MN864787
]
3-1. Error Code H1-01 failure detection procedure
NO
YES
NO
YES
Go to next page.
YES
Checking the reset waveform. (HDMI Tx)
Check item(3-1.3.).
Checking the reset waveform :
Check the waveform.
Is the [
TP
] waveform of the TP near the HDMI Tx [
U3401
] correct
(like the one shown in the diagram) when the power is turned
on?
HDMI Tx
U3401
RESET
Check the reset circuit between
CPU [
U6201
] and HDMI Tx
[
U3401
].
If there is no problem, the HDMI
Tx [
U3401
] is faulty.
Replace with a new device.
Recheck from
check item (3.1.)
If it does not work, replace the
PCB.
NO
Examples of confirmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
102
