When the results of check item (46) are "
00
"
(Detection of 5V is not OK.)
When the results of check item (47) are "
00 or 04
"
(If the DDC are not OK)
Check item(48).
Check the +5V voltage.
Does "+5 V" at the following test point indicate 5V?
The test points are as follows. (HDMI SW[
U1024
]
N1014
+5V 18pin
Check item(49).
Check the DDC line :
Does "
DDCCL" and "DDCDA" signal of the HDMI SW
[
U1024
] indicate 5 V?
The test points are as follows.
N1014
DDCCL 19pin DDCDA 20pin
Check the +5V voltage. (Front HDMI Buffer)
Check the DDC Line. (Front HDMI Buffer)
HDMI SW [
U1024
] is faulty.
Replace with a new device.
Recheck from
check item (2).
If it does not work, replace the PCB.
Recheck from
check item (2).
If it does not work, replace the PCB.
HDMI SW [
U1024
] is faulty.
Replace with a new device.
Check for a short circuit in the 5V line, the
Front HDMI FFC, and the 5V Switch [
U1025
].
If there is no problem, the HDMI SW1[
U1024
]
or 5VSwitch[
U1025
] 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
[
U3000
] is faulty.
Replace with a new device.
YES
YES
NO
NO
less than 100KHz
5V
5V
This diagram shows an example of the DDC commu-
nication waveform.
-The high level voltage is 5V.
-The frequency of the DDC CLK is 100 KHz or less.
Check at each test point.
Voltage scale：2.0V/div
Time scale：40us/div
98
Caution in
servicing
Electrical
Mechanical
Repair Information
Updating
