When the results of check item (53) are "
78 or 70
"
(Detection of 5V is not OK.)
When the results of check item (54) are "
00 or 04
"
(Detection of DDC is not OK.)
Check item(55).
Check the +5V voltage.
Does the HDMI Tx (
IC431
) test point indicate (
5V
)?
The test points are as follows.
IC431
106 pin
5V
Check item(56).
Check the DDC line :
Are the "
DDCSCK
" and "
DDCSDA
" waveforms for
the HDMI Tx (
IC431
) signal correct (as shown in the
figure)?
The test points are as follows.
CN431
DDCSCK
DDCSDA
Check the +5V voltage. (Front HDMI Buffer)
Check the DDC Line. (Front HDMI Buffer)
HDMI Tx (
IC431
) is faulty.
Replace with a new device.
Recheck from
check item (5).
If it does not work, replace the PCB.
Recheck from
check item (5).
If it does not work, replace the PCB.
HDMI Tx (
IC431
) 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 (
IC392
).
If there is no problem, the HDMI Tx (
IC431
) or
the 5 V Switch (
IC392
) 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(
IC101
) is faulty.
Replace with a new device.
YES
YES
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 100 KHz or less.
Check at each test point.
123
Caution in
servicing
Electrical
Mechanical
Repair Information
Updating
