When the results of check item (22) are "
00
"
(Detection of 5V is not OK.)
When the results of check item (23) are "
00 or 04
"
(If the DDC are not OK)
Check item(24).
Check the +5V voltage :
Does "+5 V" at the following test point indicate 5 V?
The test points are as follows.
Check item(25).
Check the DDC line :
Does "DDCCL / DDCDA" signal of the RX1(
U1000
)
indicate 5 V?
The test points are as follows.
Check the +5V voltage. (Front HDMI Buffer)
Check the DDC line. (Front HDMI Buffer)
HDMI Rx1 (
U1000
) is faulty.
Replace with a new device.
Recheck from
check item (3).
If it does not work, replace the PCB.
Recheck from
check item (3).
If it does not work, replace the PCB.
HDMI Rx1 (
U1000
) is faulty.
Replace with a new device.
Check for a short circuit in the 5 V line, the
Front HDMI FFC, and the 5 V Switch (
U1002
).
If there is no problem, the HDMI Rx (
U1000
) or
the 5 V Switch (
U1002
) is faulty.
Replace with a new device.
Check for a short circuit in the DDC line and
check the Front HDMI FFC.
If there is no problem, the Front HDMI
Buffer(
U1022
) is faulty.
Replace with a new device.
YES
YES
NO
NO
less than 100KHz
5V
5V
This diagram shows an example of the DDC communication
waveform.
-The high level voltage is 5V.
-The frequency of the DDC CLK is 100 KHz or less.
Check at each test point.
91
Caution in
servicing
Electrical
Mechanical
Repair Information
Updating
