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
NOYES
NOYES
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 conî™°rmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
Before Servicing
This Unit
Electrical Mechanical Repair Information Updating
102
To Next Page
Loading...
