Technical description and composition of the SONY KDL-42EX440 TV, panel type and applicable modules. The composition of the modules.SONY
Model: KDL-42EX440
Chassis / Version: AZ3FK
Panel: 42 inch
T-CON: V320HJ2-CPE3
Power Supply (PSU): APS-334
MainBoard: IP-0125J00-4011
IC MainBoard: CPU: MT5367ZUNU; EEPROM: 24C128
Tuner: SUT-RE215TN
Technical Specifications KDL-42EX440
SONY KDL-42EX440
General recommendations for repairing TV LCD
An external examination of the external and internal elements should be carried out in a timely manner before the start of operations for their dismantling. Often, by the visible signs of a change in the state of some elements, one can judge the causes of the defect. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in solders will help the master to guess the causes and possible consequences of the malfunction.
If the SONY KDL-42EX440 does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a failure of the APS-334 power module. In some cases, only the processor power regulator may be faulty. In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should be started by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
If the power keys of the pulse converter are not equal, you should pay attention to other elements in their bundling, which may be the result or cause of their breakdown.
If the SONY KDL-42EX440 does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction of the display backlight, or their power converter - inverter. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the inverter itself, including in the secondary rectifier of the main PSU. When disabling protection in order to enable the diagnosis of a malfunction, special care should be taken, and after completion of all repair work, it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
On the IP-0125J00-4011 motherboard, in case of a malfunction, you should first check the performance of all the stabilizers and power converters of the microcircuits, and also, if necessary, update the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - CPU: MT5367ZUNU; EEPROM: 24C128 and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
Before changing the SUT-RE215TN 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 pins and check the software for correctness.
Attention to the owners! Attempts to self-repair a SONY KDL-42EX440 TV are not recommended by the manufacturer and can lead to serious negative consequences!
Service manual / Schematic Diagram ------------------> Sony KDL-32EX340, KDL-42EX440, KDL-42EX441. CHASSIS AZ3FK
The appearance of MainBoard IP-0125J00-4011 is shown in the figure below:IP-0125J00-4011
The appearance of the power supply
Main features of the device SONY KDL-42EX440:
Installed matrix (LCD-panel) 42 inches.
The matrix control uses the Timing Controller (T-CON) V320HJ2-CPE3.
The formation of the necessary supply voltages for all nodes of the SONY KDL-42EX440 TV is carried out by the APS-334 power module, or its analogs.
MainBoard - the main board (motherboard) is an IP-0125J00-4011 module, using CPU chips: MT5367ZUNU; EEPROM: 24C128 and others.
The SUT-RE215TN tuner provides television reception and channel tuning.