SONY KDL-32EX725 / KDL-32EX725 / KDL-40EX725 / KDL-40EX725 / KDL-55EX725 / KDL-55EX725
FULL HD 3D EDGE LED TV
ERROR CODES AND DESCRIPTION
2X Blink - Main Power Error
A 2X protection mode blink pattern can be activated due one of thefollowing defects.
● Loss of REG12V (LVP)*
● Loss of -125V (Single Line)
● Excessive -125V Level (OVP)*
● Loss of Power-ON Signal
● Excessive PFC Voltage (OVP)
● Excessive PFC Temperature (OTP)
*Low Voltage Protection (LVP)
*Over Voltage Protection (OVP)
A loss or excessive condition of the REG12VDC secondary voltage from the main power supply IC6351 will cause a 2X blink pattern on the standby LED. The 12Vdc can be checked at CN6704/pin 16. If the measurement is 0V or rises above 12Vdc (approaches 15V) 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.
After confiming proper REG12V levels, check the Negative LED Backlight supply levels. A loss or excessive condition of the negative supply will cause a 2X blink failure. The voltage level can be checked at CN6701/pins 1 & 3 before the TV shuts off. There will be 2 to 4 wires (Red & Blue) depending on the panel size. All individual wires should be checked for proper voltage level. In normal operation the voltage level will initially rise to approximately -175V and then should regulate down to between 89V and 125V depending on the Backlight adjustment in the User Menu. If one of the negative supplies is 0V or rises above -175V before shut-off then the Power Supply Board is defective, replace it to fi the problem.
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 PowerON voltage level at CN6704/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.
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 all 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 fi the TV.
3X Blink- DC Regulator/Audio Error
The Audio error can occur due on of the following error conditions.● Defective DC Regulator on Main Board
● Shorted or Damaged Speaker Connections
● Defective Audio Amplifir (Main Board)
● Loss of AU12V (Open F4200 on Main Board)
● Loss of AU12V (Open Fuse on Power Supply Board)
The fist 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. Either
an open F4200, defective DC Regulator, or defective Audio amplifir will cause a
3X blink
protection mode. In any of these cases, replace the Main Board to fi this condition. A defect on the Power Supply Board can cause a 3X blink protection mode and shut-off. Check the AU12V level at CN6704/pin 14. If 0V is measure before shut-off the Power Supply Board is defective.
protection mode. In any of these cases, replace the Main Board to fi this condition. A defect on the Power Supply Board can cause a 3X blink protection mode and shut-off. Check the AU12V level at CN6704/pin 14. If 0V is measure before shut-off the Power Supply Board is defective.
4X Blink – Balancer Error
The 4X error code is only used on models incorporating local dimming LED
backlighting. If a failure occurs on the LD board the TV will shut down and
display this diagnostic code. Models using conventional non-local dimming LED
backlighting do not utilize this error code.
5X Blink - T-CON Error
The 5X blink protection mode indicates a communications error between the T-CON
Board and the X-Reality microprocessor on the Main Board. If the T-CON is available
for replacement, replace the T-CON. If the T-CON is not available, the LCD
panel must be replaced since the T-CON circuit is part of the LCD panel
assembly. In rare cases a loose or defective LVDS cable could also be the cause.
6X Blink - Backlight System
Failure
NOTE: All models will make two attempts to power up before a 6X is activated.
The SONY logo (Backlight) may or may not display on the screen. However, the
splash tones will be heard two times. After the second attempt the TV will turn
off and the standby LED will blink a 6X protection mode. (Note: The splash tone
may not be heard if it is turned off or the volume is set to minimum.) If a 6X
blink pattern is activated then a defect has occurred in one of the following
areas.● Defective Panel LED(s)
● Defective Power Supply
When troubleshooting a 6X backlight system failure it is key to notice if the backlights illuminate before the TV shuts off. The following list shows the possible backlight status and blink pattern and the possible failed components.
1) Momentary Backlight and 6X
a) Defective LED(s) (LCD Panel Assb.)
2) No Backlight and 6X
a) Replace Power Supply
In most cases, if the Sony logo (Backlight) momentarily illuminates and the TV shuts off and a 6X is activated than one or more of the backlight LEDs are defective. The LCD Panel assembly panel must be replaced for a defective LED. However, before replacing the LCD panel assembly check for a complete loss of the Negative Backlight (-89V to -125V) power supply. The -89V to -125V power supply can be checked at CN6702/pins 1 & 3.
If there is no backlight before the TV shuts
off and activates a 6X, 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 following items:
● 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 fi the problem.
● 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 fi the problem.
