Protection Mode Symptom Troubleshooting; Failure Symptoms; 2X Blink - Main Power Error; 3X Blink- Audio Error - Sony KDL-55EX500 Troubleshooting Manual

Protection Mode Symptom Troubleshooting

Reference Figures 2-5, 2.6, and 2-7
The KDL-55EX500, KDL-55EX501, and KDL-60EX500 include the
following protection mode blink patterns (or self-diagnostics).
Protect Description
Main Power Error
Audio Error
Balancer Error (55")
TCON Error
HFR Error
Backlight Error
Temperature Error
NOTE: All red protection mode LED blink patterns occur using the
Standby-LED at the lower left front of the TV.

Failure Symptoms

2X Blink - Main Power Error

A 2X protection mode blink pattern can be activated due one of the
following defects on the G5E-Board or G8S-Board..
• Loss of AU12V (LVP)*
• Excessive AU12V Level (OVP)*
• Excessive 24V Level (OVP) (60" Model)
• Excessive PFC Voltage (OVP)
CTV-65
Possible Error
Blink Pattern
Location
G5E, G8S-Brd, or A-
2
A-Brd or G5E, G8S-
3
LCD Panel, A-Brd, D1-
4
Brd, or G5E-Brd
TCON/HFR Brd or A-
5
TCON/HFR Brd or A-
5
G8S-Board,D1-Brd,
6
LCD Panel,or A-Board
7 Ventilation or A-Board
• Excessive PFC Temperature (OTP)
*Low Voltage Protection (LVP)
*Over Voltage Protection (OVP)
A loss or excessive condition of the AU12Vdc secondary voltage from the
main power supply will cause a 2X blink pattern on the Standby-LED. The
12Vdc can be checked at CN6201/pin 9 or CN2/pin 9.
If the measurement is 0V or rises above 12Vdc (approaches 15V) before
the TV shuts down then the G5E-Board or G8S-Board is defective.
Brd
If approximately 12Vdc is present and remains below 12Vdc before
shutdown then the A-Board is defective.
Brd
An excessive 24Vdc (60" Model) secondary voltage from the power supply
Z301 will also cause a 2X blink pattern on the Standby-LED. The 24Vdc
can be measured at CN4/pin 3 or CN5/pin3 on the G8S-Board before the
TV shuts down. If the voltage rises above the 24V level (approaches 27)
Brd
before the TV shuts down then the power supply is defective, replace the
G8S-Board to fix the problem.
Brd
Finally, there are PFC protection circuits on the power supply board that
when activated will cause a 2X blink protection mode (reference Figure 2-
7). The PFC circuit is monitor for both over-voltage and over-temperature.
Therefore, if the AU12V and 24V circuits checkout okay, there could still
be a problem on the power supply board in the PFC circuit causing the 2X
blink. Replace the G5E-Board or G8S-Board to fix this condition.

3X Blink- Audio Error

The Audio error can occur due one of the following error conditions.
• Shorted or Damaged Speaker Connections
• Defective Audio Amplifier (A-Board)
• Loss of AU12V (Open F1 on A-Board)
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.
AZ1K Chassis Models Overview
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