When the results of check item (88) are "78 or 70"
(Detection of 5V is not OK.)
When the results of check item (89) are "00 or 04"
(Detection of DDC is not OK.)
Check item(90). Check the +5V voltage.
Does the HDMI Tx [U3401] test point indicate (5V)?
The test points are as follows.
U3401
106 pin
Check item(91). Check the DDC line :
Are the "DDCSCK" and "DDCSDA" waveforms for
the HDMI Tx [U3401] signal correct (as shown in the
î™°gure)?
The test points are as follows.
N3403
F-HDMI
DDCSCK
DDCSDA
Check the +5V voltage. (HDMI DDC Buffer) Check the DDC Line. (HDMI DDC Buffer)
HDMI Tx [U3401] is faulty.
Replace with a new device.
Recheck from check item (4).
If it does not work, replace the PCB.
Recheck from check item (4).
If it does not work, replace the PCB.
HDMI Tx [U3401] 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 [U2400].
If there is no problem, the HDMI Tx [U3401] or
the 5V Switch [U2400] 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 HDMI DDC Buffer
[U5501] 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
136
Caution in
servicing
Electrical Mechanical Repair Information Updating
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