Technical description and composition of the SONY KDL-22PX300 TV, panel type and applicable modules. The composition of the modules.SONY
Model: KDL-22PX300
Chassis / Version: AZ1-L
Panel: A216V3
Inverter (backlight): integrated into PSU
PWM Inverter: OZ9972A
MOSFET Inverter: SP8K4FU7TB
Power Supply (PSU): 1-881-518-11 (1-474-264-11)
PWM Power: FA5571P-A2, R1225N332A
MOSFET Power: FMV10N80E
MainBoard: 1-881-636-23 (A1798-464-A)
IC MainBoard: CPU: MB91F313A, EEPROM: 24C32, Audio: TA55707
Tuner: SUT-AE101T
Technical Specifications KDL-22PX300
SONY KDL-22PX300
General recommendations for repairing TV LCD
Possible manifestations of defects
- The SONY KDL-22PX300 TV does not turn on at all. The control lights do not light or flash. The TV on the remote control and the control panel buttons do not respond.
Typically, with such manifestations, the defect is caused by faulty elements in the main power module 1-881-518-11. It is necessary to measure its output voltages and, if they are absent, check the serviceability of power switches (FMV10N80E) and rectifier diodes in the converters for possible breakdown.
In case of breakdowns of diodes in the secondary circuits, the converter can operate in emergency short circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback (OOS) stabilization circuits. PWM controllers (PWM) FA5571P-A2, R1225N332A, if they do not have visible damage to the case and open short circuit between the terminals, are usually checked by replacement.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
These manifestations can be triggered by the power module, or by inverter defects, as well as by the distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the power supply of the inverter are serviceable, you should make sure that the lamps are in good working condition, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The indicator on the front panel blinks, the TV does not turn on in operating mode, it does not respond to the remote control.
Repair or diagnostics of the 1-881-636-23 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). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements TA55707, MB91F313A requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the voltage of the tuner SUT-AE101T and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
TV users and owners need to remember that attempts to self-repair a SONY KDL-22PX300 TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
The appearance of MainBoard 1-881-636-23 is shown in the figure below:1-881-636-23
The appearance of the power supply
Main features of the device SONY KDL-22PX300:
Installed matrix (LCD-panel) A216V3.
To power the backlight, a converter is used, combined with a power supply, controlled by the OZ9972A PWM controller. As power elements of the inverter, keys of the type SP8K4FU7TB are used.
The necessary supply voltages for all nodes of the SONY KDL-22PX300 TV are generated by the power module 1-881-518-11, or its analogs using the FA5571P-A2, R1225N332A microchips and power switches of the FMV10N80E type.
MainBoard - the main board (motherboard) is a 1-881-636-23 module, using CPU chips: MB91F313A, EEPROM: 24C32, Audio: TA55707 and others.
The SUT-AE101T tuner provides television reception and channel tuning.
