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KDL-26EX550
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127
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14.06 MB
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PDF
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Service Manual
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Device
TV
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kdl-26ex550.pdf
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Sony KDL-26EX550 Service Manual ▷ View online

SAFETY CHECK-OUT
Leakage Test
The AC leakage from any exposed metal part to earth ground and from all exposed metal parts to any exposed 
metal part having a return to chassis, must not exceed 0.5 mA (500 microamperes).
L k
b
d b
f h
h d
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers’ 
instructions to use these instructions.
2 A battery-operated AC milliampmeter The Data Precision 245 digital multimeter is suitable for this job
2. A battery operated AC milliampmeter. The Data Precision 245 digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM or battery-operated AC voltmeter. The 
“limit” indication is 0.75 V, so analog meters must have an accurate low voltage scale.
The Simpson’s 250 and Sanwa SH-63TRD are examples of passive VOMs that are suitable. Nearly all 
battery-operated digital multimeters that have a 2 VAC range are suitable (see Figure A).
How to Find a Good Earth Ground
How to Find a Good Earth Ground
A cold-water pipe is a guaranteed earth ground; the cover-plate retaining screw on most AC outlet boxes is also 
at earth ground.
If the retaining screw is to be used as your earth ground, verify that it is at ground by measuring the resistance 
between it and a cold-water pipe with an ohmmeter. The reading should be zero ohms.
If a cold water pipe is not accessible connect a 60 to 100 watt trouble light (not a neon lamp) between the hot
If a cold-water pipe is not accessible, connect a 60- to 100-watt trouble- light (not a neon lamp) between the hot 
side of the receptacle and the retaining screw. Try both slots, if necessary, to locate the hot side on the line; the 
lamp should light at normal brilliance if the screw is at ground potential (see Figure B).
KDL-26EX550
9
SELF DIAGNOSIS FUNCTION
The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY
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 th
If an error symptom cannot be reproduced, the remote commander can be used to review the
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.
STBY
Flash
2
3
If the screen displays a “0”, no error has occurred .
DISPLAY OF STANDBY LED FLASH COUNT
4
5
3
0.5
0 5
6
8
9
7
0.5
3
SELF-DIAGNOSTIC SCREEN DISPLAY
For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes o
fi
i
h
9
1
1
1
confirmation on the screen:
[To Bring Up Screen Test]
In standby mode, press buttons on the remote commander sequentially in rapid succession a
5
*
DISPLAY
Channel
Volume
KDL-26EX550
5
*
 : Note that this differs fro
DISPLAY
Channel
Volume
Y LED will automatically begin to flash.
he user’s knowledge and reference.
e failure occurrence data stored in memory to reveal past problems and how often these 
Y LED
h time
Service menu Item
name
(Screeen Display)
Diagnostic Item Description
2
MAIN_POWE
Main Power Over Voltage Protection
DC ALERT
DC ALERT
3
DC_ALERT
DC_ALERT
AUD_PROT
Audio Abnormal Detection
HDMI_EQ
HDMI equalizer/switch I2C NACK
TU_DEMOD
Tuner or dem odulator I2C NACK
4
-
Not used
5
P_ID_ERR
Panel ID NVM Error
3
6
BACKLITE
Backlight failure
TEMP_ERR
Therm al Error
FAN_ERR
Not used
8
-
Software Error (Also the main board’s mem ory or Wi-Fi
module is a suspect)
9
-
Not used
7
out” that cannot be confirmed, it is possible to bring up past occurrences of failure for 
9
Not used
0
-
Not used
1
-
Not used
2
-
Not used
as shown below:
TV POWER
10
 from entering the service mode (volume +)
TV POWER
SELF DIAGNOSIS FUNCTION
SELF CHECK
[SELF DIAGNOSTIC SAMPLE SCREEN DISPLAY]
000 RESERVED   ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 00
000 RESERVED   ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 00
002 MAIN_POWE  ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 00
003 DC_ALERT   ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 00
003 AUD_PROT   ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 00
003 HDMI_EQ    ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 00
Item name
003 TU_DEMOD   ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 00
004 VLED       ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 00
004 LD_ERR     ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 00
005 HFR_ERR    ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 00
005 TCON_ERR   1108231325 ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 01
005 P_ID_ERR   ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 00
Error count (00-99)
STBY LED flash time
006 BACKLITE   ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 00
007 TEMP_ERR   ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 00
007 FAN_ERR    ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 00
010 EMITTER    ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 00
101 VPC_WDT    ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 00
102 MEPS_WDT   ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 00
CPU Watch-dog timer
103 HOST_WDT   ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 00
104 STBY_WDT   ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 00
0081‐00671‐00088
Error history (Last failure time beforehand) *1
Error history (Failure time before last) *1
Error history (The last failure time) *1
Panel operation time by hour (MAX:65535)
CPU Watch dog timer
*1 :
Format of error history
Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen.
After you have completed the repairs clear the result display to “0”
Total operation time by hour (MAX:65535)
Boot count (MAX:65535)
Panel operation time by hour (MAX:65535)
1 : 
Format of error history
YYMMDDhhmm (in UTC)
Example:1108231325 -> Aug 23 13:25 2011 UTC
After you have completed the repairs, clear the result display to  0 .
Clearing the Self Check Diagnostic List
1. Error history and Error count :
Press the Channel 8 => Channel 0 .
2. Panel operation time :
Press the Channel 7 => Channel 0 .
KDL-26EX550
11
Exiting the Self-diagnostic screen
To exit the Self Diagnostic screen, turn off the power to the TV by pressing the POWER button on the remote or the POWER button on the TV.
SEC 1. DISASSEMBLY
• There are clutch in the yellow frame[           ]. Therefore please be careful in the case of the disassembly or assembly of parts.
Note: When removing the rear cover, to prevent damaging the rear cover, please refer Appendix 1.
1-1. KDL-26EX550
1-1-1. EASEL STAND
1
2
EASEL STAND
P/N:  4-300-957-01
(F F t P d P &
2 Screws (SCREW, +PSW M5X16) P/N: 2-580-608-01
EASEL STAND
(For Foot Pad P & 
Pipe Foot  P/N, 
Please refer to Other  
Part Section 5-1-4).
KDL-26EX550
12
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