When the results of check item (22) are "00 or 04"
(Detection of DDC is not OK.)
Check item(24). Check the DDC line HPD line :
Are waveforms of "DDCSCK" and "DDCSDA" observed at the test point near the HDMI input
terminal(JK701/JK711/JK721)?
HDMI 2
(DVD/Blu-ray)
HDMI 1
(CBL/SAT)
HDMI 3
(Media Player)
DDCSCK
DDCSDA
Check the DDC line (HDMI SW)
HDMI SW(IC701) is faulty.
Replace with a new device.
Check for a short circuit in the DDC line.
If there is no problem, the HDMI SW(IC701) is
faulty.
Replace with a new device.
Recheck from check item (2).
If it does not work, replace the PCB.
YES NO
less than 100KHz
5V
5V
This diagram shows an example of the DDC com-
munication waveform.
-The high level voltage is 5V.
-The frequency of the DDC CLK is 100 KHz or less.
Check at each test point.
When the results of check item (21) are "00"
(Detection of 5V is not OK)
Check item(23). Check the +5V voltage :
Does "+5 V" at the following test point indicate 5 V? (JK701/JK711/JK721)
Checking +5 V voltage (HDMI SW)
HDMI 1
(CBL/SAT)
HDMI 2
(DVD/Blu-ray)
+5V +5V
HDMI 3
(Media Player)
+5V
HDMI SW(IC701) is faulty.
Replace with a new device.
Check for a short circuit in the 5 V line and the 5
V Switch IC (IC733).
If there is no problem, the HDMI SW (IC701) is
faulty.
Replace with a new device.
YES NO
Recheck from check item (2).
If it does not work, replace the PCB.
83
Caution in
servicing
Electrical Mechanical Repair Information Updating
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