Technical description and composition of the SONY KDL-60LX900 TV, panel type and applicable modules. The composition of the modules.SONY LED
Model: KDL-60LX900
Chassis / Version: AZ1-H
Panel: P-MOD60LETT
T-CON: CPWBX4351TP / RUNTK4351TP
LED driver (backlight): integrated into PSU
Power Supply (PSU): APS-267 (CH) 1-881-894-11
PWM Power: MIP2H2
MainBoard: 1-881-779-12
IC MainBoard: K9F1208U0C, TAS5707
Tuner: SUT-HE111Z
Technical Specifications KDL-60LX900
SONY KDL-60LX900
General repair guidelines for TV LCD LED
Possible malfunctions
- SONY KDL-60LX900 does not turn on, the indicators on the front panel do not light up and do not blink. The TV does not respond to the control buttons and the remote control.
Often in such cases, the APS-267 power module is faulty. Then it is necessary to measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of power switches and rectifier diodes of the converters for a possible short circuit.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And during short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. MIP2H2 PWM controllers, in the absence of visible damage or explicit short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
A malfunction is usually most likely in these cases at the backlight nodes of the display matrix. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
To check the health in the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can check each LED individually with a simple Chinese multimeter (powered by 9 volts) in the P-N-junction test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. A zener diode PN junction indirectly indicates a LED-a
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the 1-881-779-12 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements K9F1208U0C, TAS5707. BGA chip malfunctions are usually easy to detect by warming up.
Before changing the SUT-HE111Z tuner, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding tuner terminals and checked for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Owners and users of the SONY KDL-60LX900 TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
Service Manual with Schematic Diagram 138 pages of 2010 for the ---------> KDL-40LX900, KDL-40LX903, KDL-40LX904, KDL-40LX905, KDL-52LX900, KDL-52LX904, KDL-52LX905, KDL-60LX900, KDL-60LX903, KDL-60LX905.
The appearance of MainBoard 1-881-779-12 is shown in the figure below:1-881-779-12
The appearance of the power supply
Main features of the device SONY KDL-60LX900:
Installed matrix (LED-panel) P-MOD60LETT.
The matrix control uses the Timing Controller (T-CON) CPWBX4351TP.
To power the backlight LEDs, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the SONY KDL-60LX900 TV is carried out by the APS-267 power module, or its analogs using MIP2H2 microcircuits.
MainBoard - the main board (motherboard) is a module 1-881-779-12, using chips K9F1208U0C, TAS5707 and others.
The SUT-HE111Z tuner provides television reception and channel tuning.