Sony KDL-22EX425 Service Manual page 38

than check the "Backlight ON" signal from the TV microprocessor
and the Positive (+145V) Backlight power supply from the Power
Supply Board. The BL-ON signal can be checked at CN6704/pin 5
and the +145V at CN6701/pins 1 & 3.
If the "Backlight-ON" signal is okay and the Positive Power supply
is missing then the Power Supply Board is defective. However, if
the Backlight-ON is missing then the X-Reality Microprocessor is
defective and the Main Board must be replaced to repair the problem.
7X Blink - Temperature Failure
These models do not display a temperature warning OSD dialogue
box before shutting off and going into a 7X standby LED blink pattern.
The main objective when a 7X blink pattern occurs is to determine
which of the following possible defects is causing the excessive
temperature condition indication.
● Excessive Ambient Room Temperature
● Dust or Debris Blocking the TV Ventilation Apertures
● Defective Temperature Sensor or X-Reality Microprocessor
(Main Board)
The first step is to notice how long it takes the TV to shut off and
trigger a 7X blink protection mode.
If the TV has an actual excessive temperature condition it will
take a considerable period of time to shut off and indicate a 7X
blink protection mode. This is because it will take time for the TV
components to heat up and for the temperature sensor to detect the
excessive temperature and shut the TV off.
If the TV takes a considerable period of time to shut-off check the
KDL-22EX425/32EX425/32EX525/40EX525/46EX525
SECTION 4 - TROUBLESHOOTING
following items:
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The TV should not be located too close to any heating
devices.
The TV should have at least 4 inches of clearance around
the sides & rear, and 11 inches of clearance over the top to
ensure adequate ventilation.
Check that all vented areas on the TV are clear of all dust
and debris.
If the TV shuts off immediately after Power-ON then one
of the following components has failed (Not an Actual
Excessive Temperature Condition).
X-Reality Microprocessor (Main Board)
Temperature Sensor (Main Board)
In either case the Main Board must be replaced to fix the
problem.
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