Category: LCD Television Repair and Service
Contents of this article
- How to enter to service mode
- LED Blinking and Causes
- Self diagnostics
Sony KLV-40S550A
SELF DIAGNOSIS FUNCTION
If an error occurs, the STANDBY LED will automatically begin to flash. The number of times the LED flashes translates to a probable source of the problem. A definition of the STANDBY LED flash indicators is listed in the instruction manual for the user’s knowledge and reference. If an error symptom cannot be reproduced, the remote commander can be used to review the failure occurrence data stored in memory to reveal past problems and how often these problems occur.
DIAGNOSTIC TEST INDICATORS
When an error occurs, the STANDBY LED will flash a set number of times to indicate the possible cause of the problem.
If there is more than one error, the LED will identify the first of the problem areas. Result for all of the following diagnostic items are displayed on screen. If the screen displays a “0”, no error has occurred .
DIAGNOSTIC TEST INDICATORS
When an error occurs, the STANDBY LED will flash a set number of times to indicate the possible cause of the problem.
If there is more than one error, the LED will identify the first of the problem areas. Result for all of the following diagnostic items are displayed on screen. If the screen displays a “0”, no error has occurred .
LED BLINKING CODE
Number of times STANDY LED (Red) flashes
|
Monitoring Items
(Screen Display) |
Diagnostic Item Description
|
2 times
|
DC_DET
|
Power supply voltage error
|
3 times
|
DC_ALERT 1
|
Confirm the voltage at F7016 is about 3.3V and F7016 is not open.
Confirm the voltage at F7015 is about 5V and F7015 is not open. |
4 times
|
DC_ALERT 2
|
Confirm the voltage at F7017 is about 1.8V and F7017 is not open.
Confirm the voltage at C7110 is about 5.5V and F7012 is not open. (Only applicable for AM series) |
5 times
|
DC_ALERT 3
|
Confirm if F7003 is open.
Confirm voltage at either pin 5, 6, 7 or 8 of IC7009 is the following: 12V |
6 times
|
BACKLIGHT/INVERTER ERROR
|
Confirm if input to Q9008 is about 3.3V.
|
7 times
|
INTERNAL TEMP ERROR
|
If internal temperature of the LCD set increases over 70C it will shut down and the set goes to standby.
|
8 times
|
AUDIO ERROR
|
Confirm the correct value at AU_13V, AU_12V (=10V).
Confirm the speaker is OK, speaker terminal is not shorted to GND. Change IC2007 to a new one. |
9 times
|
FAN ERROR
|
Fan error.
|
10 times
|
DEF ERROR
|
Digital EF circuit error.
|
11 times
|
NVM ERROR
|
NVM is broken.
No power supply to NVM. |
12 times
|
IIC ERROR
|
No communication between IC9000 and IC3000.
|
13 times
|
BALANCER ERROR
|
Confirm if input to Q9009 is about 3.3V.
|
14 times
|
HDMI ERROR
|
-
|
STOPPING THE STANDBY FLASH
Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY LED from flashing.
SELF-DIAGNOSTIC SCREEN DISPLAY
For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confirmed, it is possible to bring up past occurrences of failure for confirmation on the screen:
SELF-DIAGNOSTIC SCREEN DISPLAY
For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confirmed, it is possible to bring up past occurrences of failure for confirmation on the screen:
To Bring Up Screen Test
In standby mode, press buttons on the remote commander sequentially in rapid succession as shown below:
In standby mode, press buttons on the remote commander sequentially in rapid succession as shown below:
DISPLAY > Channel 5 > Volume - > POWER On.
Quitting Self-diagnostic screen
To quit the entire self-diagnostic screen, turn off the power switch on the remote commander or the main unit.
To quit the entire self-diagnostic screen, turn off the power switch on the remote commander or the main unit.
ACCESSING THE DIGITAL SERVICE
ADJUSTMENT MENUS
1. Turn the TV on and view a Digital channel.
2. Put the TV in standby mode. (Power off).
3. Press the following buttons on the Remote Commander within a second:
DISPLAY > Channel 5 > Volume + > POWER On.
The Digital service menu displays.
ADJUSTMENT MENUS
1. Turn the TV on and view a Digital channel.
2. Put the TV in standby mode. (Power off).
3. Press the following buttons on the Remote Commander within a second:
DISPLAY > Channel 5 > Volume + > POWER On.
The Digital service menu displays.
