Thursday, October 22, 2015

SONY KDL-32L4000 - KDL-37L4000 SERVICE MODE FACTORY RESET AND POWER SUPPLY CIRCUIT

SONY KDL-32L4000 - KDL-37L4000 

SERVICE MODE FACTORY RESET AND POWER SUPPLY CIRCUIT 

ACCESSING SERVICE (FACTORY) MODE
Use the remote commander to access Service (Factory) mode after completing a repair to the TV set.
1. TV must be turned On (Power ON).
2. To display the service menu, quickly press the following buttons on the Remote Commander:
LEFT ARROW > RIGHT ARROW > MUTE > ENTER >MUTE > MENU

RESETTING TO FACTORY DEFAULTS AFTER BOARD REPLACEMENT
If you are replacing the A Board, the new A Board will be pre-programmed, therefore, a factory reset is not required. However, if you have the User
Data from the customer you should reset the customer settings after replacing the board.
Use the instructions below if you were able to repair the A Board.
CAUTION: Resetting the TV to the Factory Defaults will over-write all customer settings including Parental Lock setting. Before performing this reset, contact the customer to determine what adjustments they have made.
1. TV must be in Service (Factory) Mode.
2. Press DOWN to select Factory Reset.
3. Press ENTER  to select Yes.
4. When the Reset is complete, the text changes to No.
5. To exit “service mode”, press the MENU button
VIEWING MODEL INFORMATION
Use the Setup settings menu to display information about the TV.
1. TV must be On.
2. Press the button MENU to display the User Menus.
3. Press DOWN until the Settings icon is selected, and then press ENTER.
4. Press DOWN until Product Information is selected, and then press ENETR.
5. To exit, press the MENU button
CLEANING THE LCD PANEL
CAUTION: When cleaning the TV, be sure to unplug the power cord to avoid any chance of electric shock.
1 Clean the cabinet of the TV with a dry soft cloth.
2 Wipe the LCD screen gently with a soft cloth.
 # Stubborn stains may be removed with a cloth slightly moistened with a solution of mild soap and warm water.
 # If using a chemically pretreated cloth, please follow the instruction provided on the package.
 # Never use strong solvents such as a thinner, alcohol or benzine for cleaning.
 # Periodic vacuuming of the ventilation openings is recommended to ensure to proper ventilation.
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.
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.
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

POWER SUPPLY CIRCUIT 

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