When the results of check item (3-14.1.) are "61"
(Detection of 5V is not OK.)
When the results of check item (3-14.3.) are "Other than 03"
(Detection of DDC is not OK.)
Check item(3-14.4.). Check the +5V voltage.
Does the HDMI Tx [U9101] test point indicate (5V)?
Test points near the [N2402] are as follows.
N2402
HDMI IN 7
[8K]
+5V
Check item(3-14.5.). Check the DDC line :
Are the "DDCSCK" and "DDCSDA" waveforms for
the HDMI Tx [U9101] signal correct (as shown in the
gure)?
Test points near the [N2402] are as follows.
N2402
HDMI IN 7
[8K]
DDCSCK
DDCSDA
Check the +5V voltage. (HDMI IN7) Check the DDC Line. (HDMI IN7)
HDMI Tx [U9101] is faulty.
Replace with a new device.
Recheck from check item (3.4.).
If it does not work, replace the PCB.
Recheck from check item (3.4.).
If it does not work, replace the PCB.
HDMI Tx [U9101] is faulty.
Replace with a new device.
Check for a short circuit in the 5V line and
check the [N2402].
If there is no problem, the HDMI Tx [U9101] is
faulty.
Replace with a new device.
Check for a short circuit in the DDC line and
check the [N2402].
If there is no problem, the HDMI Tx [U9101] is
faulty.
Replace with a new device.
YESYES
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 100kHz or less.
Check at each test point.
Voltage scale : 2.0V/div
Time scale : 40us/div
142
Before Servicing
This Unit
Electrical Mechanical Repair Information Updating
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