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Model
KDL-46HX900 KDL-46HX903 KDL-46HX905 KDL-52HX900 KDL-52HX903 KDL-52HX905
Pages
51
Size
2.69 MB
Type
PDF
Document
Service Manual
Brand
Device
TV
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kdl-46hx900-kdl-46hx903-kdl-46hx905-kdl-52hx900-kd.pdf
Date

Sony KDL-46HX900 / KDL-46HX903 / KDL-46HX905 / KDL-52HX900 / KDL-52HX903 / KDL-52HX905 Service Manual ▷ View online

KDL-46/52HX900,903,905(AEP/UK)
8
SAFETY CHECK-OUT
After correcting the original service problem, perform the following safety checks before 
releasing the set to the customer:
1. Check the area of your repair for unsoldered or poorly soldered connections. Check the entire 
board surface for solder splashes and bridges.
2. Check the interboard wiring to ensure that no wires are “pinched” or touching high-wattage 
resistors.
3. Check that all control knobs, shields, covers, ground straps, and mounting hardware have been 
replaced. Be absolutely certain that you have replaced all the insulators.
4. Look for unauthorized replacement parts, particularly transistors, that were installed during a 
previous repair. Point them out to the customer and recommend their replacement.
5. Look for parts which, though functioning, show obvious signs of deterioration. Point them out 
to the customer and recommend their replacement.
6. Check the line cords for cracks and abrasion. Recommend the replacement of any such line 
cord to the customer.
7. Check the antenna terminals, metal trim, “metallized” knobs, screws, and all other exposed 
metal parts for AC leakage. Check leakage as described below.
8. For safety reasons, repairing the Power board and/or Inverter board is prohibited.
KDL-46/52HX900,903,905(AEP/UK)
9
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).
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.
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
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 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-46/52HX900,903,905(AEP/UK)
10
SELF DIAGNOSIS FUNCTION
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 .
The units in this manual contain a self-diagnostic 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.
STBY LED
Flash time
Service menu Item name
(Screen Display)
Diagnostic Item Description
2
MAIN_POWE
Main Power Over Voltage Protection
DC_ALERT
DC_ALERT
DTT_WDT
DTT Error
AUD_PROT
Audio Abnormal Detection
4
BALANCER_
Panel Balancer Error
TCON_ERR
T-CON Error
HFR_ERR
HFR Error
P_ID_ERR
Panel ID NVM Error
6
BACKLITE_
Back Light Error (Panel Inverter)
TEMP_ERR
Thermal Error
-
RGB sensor I2C Error
FAN_ERR
FAN Error (Not Detected. Display Only)
8
-
Not used
9
-
Not used
10
-
Not used
11
-
Not used
12
-
Not used
-
RGB_SEN
RGB Sensor ACK Error
3
5
7
KDL-46/52HX900,903,905(AEP/UK)
11
SELF DIAGNOSIS FUNCTION
0.5
0.5
3
DISPLAY OF STANDBY LED FLASH COUNT
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:
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