When the results of check item (3-12.3.) are "00"
(Detection of 5V is not OK.)
When the results of check item (3-12.4.) are "00 or 04"
(If the DDC are not OK)
Check item(3-12.5.). Check the +5V voltage :
Does "+5 V" at the following test point indicate 5V?
The test points are as follows.
U1000
70pin
Check item(3-12.6.). Check the DDC line :
Does "DDCCL / DDCDA" signal of the RX1 [U1000]
indicate 5 V?
The test points are as follows.
U1000
74/75pin
Check the +5V voltage. (HDMI DDC Buffer) Check the DDC line. (HDMI DDC Buffer)
HDMI Rx1 [U1000] is faulty.
Replace with a new device.
Recheck from check item (3.2.).
If it does not work, replace the PCB.
Recheck from check item (3.2.).
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 Cable.
If there is no problem, the HDMI DDC Buffer
[IC201] is faulty.
Replace with a new device.
YESYES
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
112
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