Sony KDL-40HX750 Service Training Manual page 20

2X Blink - Main Power Error
A loss of REG12V from the power supply triggers this protect event. The
usual cause is a failure of the main switching supply. In some instances,
excessive loading on the secondary supply lines can cause the switching
regulator to stop, or fail again, if a replacement board is installed.
3X Blink- DC Regulator/Audio Error/HDMI/Tuner
Several items are monitored on the main board. Any error detected in the
following circuits will cause the television to shut down and generate a 3X
error:
● Loss of regulated B+ circuits
● Audio amplifier failure
● HDMI equalizer IC
●
Tuner demodulator circuits
In most cases, replacement of the main board will remedy a 3X error.
4X Blink – Balancer Error
NOT USED IN THIS MODEL SERIES
5X Blink - TCON Error
The 5X blink protection mode indicates a communications error between
the TCON Board and the X-Reality microprocessor on the Main Board. If
the TCON is available for replacement, replace the TCON. If the TCON is
not available, the LCD panel must be replaced since the TCON circuit is
part of the LCD panel assembly. In rare cases a loose or defective LVDS
cable could also be the cause.
6X Blink - Converter System Failure
An open LED in the backlight strings will cause an over-voltage condition
in the converter circuits. The symptom will be a momentary appearance
of the backlights (Sony logo may appear) followed by a 6X shutdown.
Replacement of the LCD panel is required to remedy this condition.
If the converter fails to generate voltage for the LED backlights, the low-
voltage protection circuits are activated and the television will shut down
with a 6X error. Replacement of the Power Supply Board should remedy
this condition.
KDL-40HX750/46HX750/46HX751/55HX750/55HX751
SECTION 2 - TROUBLESHOOTING
7X Blink - Temperature Failure
If the temperature inside the television becomes excessive, the temperature
sensor (located on the Main Board) notifies the TV to shut down and display
a 7X error. Excessive temperature errors will always occur when the TV
has been running a while and can be caused by excessive ambient heat or
improper ventilation of the television.
If the television shuts down immediately, this can be caused by a defective
temperature sensing IC or failure of the communications bus between the
IC and the microprocessor. Replacement of the Main Board is necessary.
8X Blink – Not listed in Self Check
The 8X blink code is mainly used during TV software development. Look in
TV's service Self Check for error code history and notice at the bottom of
the list WDT (Watch Dog Timer) error codes, in particular notice 103 HOST_
WDT. If this error code appears, check for any additional documentation on
the Sony ESI site.
10X Blink – IR Sync Transmitter Failure
A failure of the infrared sync transmitter circuits on the HEM3 board will
cause a 10X error and replacement of this board will usually rectify the
problem. In rare cases, the Main Board could be the source of the failure.
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