When the results of check item (49) are "
00
"
(Detection of 5V is not OK.)
When the results of check item (50) are "
00 or 04
"
(If the DDC are not OK)
Check item(51).
Check the +5V voltage :
Does "+5 V" at the following test point indicate 5 V?
The test points are as follows.
U1000
70 pin
5V
Check item(52).
Check the DDC line :
Does "
DDCCL / DDCDA
" signal of the RX1 [
U1000
]
indicate 5 V?
The test points are as follows.
U1000
74/75 pin
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 (2).
If it does not work, replace the PCB.
Recheck from
check item (2).
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 Rx1 [
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
[
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 communica-
tion 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
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
113
