KDL-32EX421/32EX423/32EX520/32EX521/32EX523/40EX520/40EX521/40EX523/46EX520/46EX521/46EX523 33
2X Blink - Main Power Error
A 2X protection mode blink pattern can be activated due to one of
the following defects:
●
Loss of REG12V (LVP)*
●
Loss of Power-ON Signal
●
Excessive LED Positive Supply (OVP)*
●
Excessive PFC Voltage (OVP)*
●
Excessive PFC Temperature (OTP)*
*Low Voltage Protection (LVP)
*Over Voltage Protection (OVP)
*Over Temperature Protection
A loss of the REG12VDC secondary voltage from the main power
supply will cause a 2X blink pattern on the standby LED. The 12Vdc
can be checked at CN6704 or CN6201/pin 16.
If the measurement is 0V before the TV shuts down the Power
Supply Board is defective.
If approximately 12Vdc is present and remains below 12Vdc before
shutdown then further troubleshooting is necessary to determine the
defective component.
A defective X-Reality processor on the Main Board or Switch circuit
on the Power Supply Board will cause a loss of the Power-ON signal
(2X). To determine which component is defective check the Power-
ON voltage level at CN6704 or CN6201/pin 1. In normal operation
3V should be measured. If the 3V is present before shut-off then the
Power Supply Board is defective. If 0V is measured before shut-off
then the Main Board is defective.
An over-voltage condition on the positive LED supply (~109V) will
cause a 2X protection mode. The positive supply can be checked at
CN6701 or CN6601.
Finally, there are PFC protection circuits on the Power Supply Board
that when activated will cause a 2X blink protection mode. The PFC
circuit is monitored for both over-voltage and over-temperature.
Therefore, if the previously discussed circuits checkout okay, there
could still be a problem on the Power Supply Board in the PFC circuit
causing the 2X blink. Replacing the Power Supply Board will fix the
TV.
3X Blink- DC Regulator/Audio Error
The Audio error can occur due to of the following error conditions:
●
Defective DC Regulator on Main Board
●
Shorted or Damaged Speaker Connections
●
Defective Audio Amplifier (Main Board)
●
Loss of AU12V (Open F4200 on Main Board)
●
Loss of AU12V (Connection between Power Supply and
Main Boards)
The first thing to check when a 3X blink protection mode occurs is
the physical condition of the speakers and speaker connections. The
speakers should measure 8 ohms. Shorted speakers or connections
can cause a 3X blink protection mode.
If the speakers and connections check okay, then the defective
component is on the Main Board. An open F4200, defective
DC Regulator, or defective Audio amplifier will cause a 3X blink
protection mode. In any of these cases, replace the Main Board to
fix this condition.
Summary of Contents for Bravia KDL-40EX520
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