Protection Mode System Troubleshooting; Bink - Power Error (12V); Blink- Regulator Error (5V); Blink - Backlight Error - Sony KLV-40ZX1M Training Manual

Protection Mode System Troubleshooting

Reference Figure 2-4
The KLV-40ZX1M includes the following protection mode blink patterns.
NOTE: All protection mode blink patterns occur using the RED Power-
LED at the lower right front of the TV.

2 Bink - Power Error (12V)

The 2X Power-LED blink pattern basically indicates a power supply error.
Something has caused the main power supply IC6501 not to output
the 12V secondary voltage. The 12V is monitored directly by the BE-
Microprocessor on the B-Board. If the 12V is not detected at power-on, a
2X blink pattern is activated.
This blink pattern can also be caused by a missing Power-On signal from
the B-Board. Reference the "2X Protection Mode Blink Pattern" description
in the Power Supply Troubleshooting section for more details.

3 Blink- Regulator Error (5V)

The 3X protection mode blink can only be caused by a defective 5V
regulator IC2505 or an open F2502 on the B-Board. Therefore, if the TV
is shutting-off and a 3X blink pattern is activated replace the B-Board.

6 Blink - Backlight Error

The 6X protection mode blink pattern is caused by any error in the backlight
system including the LEDs in the LCD Panel assembly. Reference the
"LED Backlight System Troubleshooting" section for more details on
troubleshooting when this blink pattern occurs.
CTV-54

7 Blink - Temperature Error

This model does not display a temperature warning OSD dialogue box
before shutting-off and going into a 7X Power-LED blink pattern. It will just
shut-off and activates a 7X.
The main objective when a 7X blink pattern occurs is to determine which
of the following possible defects is causing the excessive temperature
indication.
• Excessively Ambient Room Temperature
• Dust or Debris Blocking the TV Ventilation Apertures
• Defective Temperature Sensor IC3502 or BE-Microprocessor
(B-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 activate a 7X blink protection
mode. This is because it will take time for the TV 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 following
items:
• The TV should not be located too close to any heating
elements.
• The TV should have at least 4 inches of clearance around all
sides 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 (Not an Actual Excessive Temperature
Condition) after the TV powers ON then one of the following components
has failed.
• Main Microprocessor IC3011 (B-Board)
• Temperature Sensor IC3502 (B-Board)
In either case, the B-Board must be replaced to fix the problem.
Troubleshooting
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