YES
YES
YES
Check the I2C communication line. (HDMI Tx)
Check item(9).
Check the I2C communication line :
Check the CPU.
Is the TP waveform of the TP near the HDMI SW1 [
U2401
] cor-
rect (like the one shown in the diagram) when the power is
turned on?
U2401
I2C(HSCL)
I2C(HSDA)
HDMI Tx [
U3401
] is
faulty.
Replace with a new
device.
HDMI SW1 [
U2401
] is
faulty.
Replace with a new
device.
HDMI SW2 [
U2601
] is
faulty.
Replace with a new
device.
CPU [
U6201
] is faulty.
Replace with a new
device.
HDMI Tx [
U3401
] is faulty.
Replace with a new device.
Recheck from
check item (1).
If it does not work, replace the PCB.
Check item(10).
Check the I2C com-
munication line :
Check HDMI SW [
U2601 or U2401
],
HDMI Tx [
U3401
] and CPU [
U6201
]
patterns as well as soldering.
If there is no problem, go to the next
step.
Check the HDMI SW1.
Remove the damping resistor
[
R2460/R2461
] of [
U2401
].
Is the "
I2C
" waveform correct?
Recheck from
check item (1).
If it does not work, replace the PCB.
Check the HDMI SW2.
Remove the damping resistor
[
R2630/R2631
] of [
U2601
].
Is the "
I2C
" waveform correct?
Check the HDMI Tx.
Remove the damping resistor
[
R3425/R3427
] of [
U3401
].
Is the "
I2C
" waveform correct?
NO
NO
NO
YES
YES
YES
NO
*The diagram shows an example.
(Signal patterns vary depending on the tim-
ing.)
Points for checking waveforms
- Crest value (3.3V normally)
- Signal change
- SCL frequency (400kHz normally)
Voltage scale : 1.0V/div
Time scale : 10us/div
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
100
