Blink - Balancer Failure (55" Model Only); 5X Blink - Tcon & Hfr Failure; Blink - Backlight System Failure (60" Models); Blink - Backlight System Failure (55" Models) - Sony KDL-55EX500 Troubleshooting Manual

If the speakers and connections check okay, then the defective component
is on the A-Board. Either a open F1 or defective audio amplifier will cause
a 3X blink protection mode. In either case, replace the A-Board to fix this
condition.
4X Blink - Balancer Failure (55" Model Only)
In most cases, a 4X protection mode indicates a defective lamp or lamps.
A defective panel can be confirmed by checking the LD protection voltage
level at CN6702/pin 5. In normal operation LD should be 12V. If the voltage
goes low then replace the LCD panel to fix this condition. If the voltage
is 12V then there could be a problem on the A-Board or D1-Board. First
replace the D1-Board then the A-Board.
5X Blink - TCON & HFR Failure
The 5X blink protection mode indicates a communications error between
the TCON/HFR board and the MT5388 microprocessor on the A-Board.
First replace the TCON/HFR Board if the 5X protection mode blink pattern
occurs. If the TCON/HFR Board does not repair the problem then replace
the A-Board.
6X Blink - Backlight System Failure (60" Models)
NOTE: All models will make three attempts to power up before a 6X
error is activated. The SONY logo (Backlight) will display on the screen
and the tones (with Volume up) will be heard three times. After the
third attempt the TV will turn off and the Standby LED will blink a 6X
protection mode.
In most cases, if the backlight momentarily illuminates and the TV
shuts off and a 6X is activated than one or more of the backlight lamps
are defective. The LCD Panel assembly panel must be replaced for a
defective lamp.
If a 6X blink pattern is activated than a defect has occurred in one of the
following areas.
• Defective Panel Lamp(s)
• Defective Backlight Inverter Board
CTV-65
• Defective TV Microprocessor
• Defective 24V 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 Lamp (Part of LCD Panel Assb)
b) Defective Backlight Inverter Brd (Part of LCD Panel Assb)
2) No Backlight and 6X
a) Defective TV Microprocessor
b) Defective 24V Power Supply
c) Defective Backlight Inverter Brd (Part of LCD Panel Assb)
IMPORTANT: 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 24V power supply from the G8S-Board.If the
"Backlight ON" and 24V power supply are okay than the Backlight
Inverter board has failed and the LCD Panel Assembly must be
replaced.
6X Blink - Backlight System Failure (55" Models)
The 55" models have both a 4X and 6X blink protection mode. The 4X
blink will, in most cases, be caused by a defective lamp (Reference 4X
Blink description).
The visual symptom for a 6X Blink error for the 55" model will be "No
Backlight Illumination" before shutdown. Because all the Backlight HV
Inverter circuits are located on the D1-Board, a 6X blink protection
mode will be fixed, in most cases, by replacing the D1-Board. If the D1-
Board does not repair the problem replace the A-Board. The BL-ON
and Dimmer signals come from the microprocessor on the A-Board.
A shorted or open BL-ON signal will cause this 6X condition. Also a
shorted Dimmer will cause this 6X condition.
AZ1K Chassis Models Overview
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