Technical description and composition of the SONY KDL-32EX720 TV, panel type and applicable modules. The composition of the modules.SONY LED
Model: KDL-32EX720
Chassis / Version: AZ2F_3a-2
Panel: LTY320HJ01
LED backlight: S1G1-320SM0-R0 LJ64-02834A
T-CON: EDL 4LV0.3
LED driver (backlight): 1-883-300-11 (1-732-438-11)
PWM LED driver: BD9276EFV
MOSFET LED driver: R5005CNJ
Power Supply (PSU): APS-312 1-884-888-11 G10A01
MainBoard: 1-883-753-32
IC MainBoard: CXD4727GB, K4B2G1646C-HCH9, KFM2GN6Q2B, Y164B, Sil9287BCNU, GL850G, BD95830MUV, PS54425
Tuner: CXD2825GA
Control: 1-883-756-11, 1-883-755-11
Technical Specifications KDL-32EX720
SONY KDL-32EX720
General repair guidelines for TV LCD LED
SONY KDL-32EX720, like other televisions, it is advisable to start repairing with a careful examination of the external and internal elements and modules. It often happens that visible damage to elements or connections helps determine the direction of the troubleshooting. If charred resistors, swollen electrolytic or cermet capacitors, ring cracks in the solders of the terminals of transformers or heating elements are found, it is advisable to establish the causes and consequences of the malfunction that has arisen, as well as to check the connected elements and assemblies.
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when turned on, there is a certain chance that the APS-312 power module is faulty and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of processor power, which is typical for certain SONY models. Diagnostics and repair of the common power supply should always begin with a check of the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for a breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the rectifier network, as well as the large electrolytic capacitor of the filter of the rectifier network.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors in switching power supplies (SMPS) fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, or dried electrolytic capacitors or dangling primary resistors BP circuits involved in the stabilization process. In this case, all semiconductor elements of the strapping of the PWM controller chip are subject to verification, which it is desirable to verify by replacement.
In cases where the SONY KDL-32EX720 TV has lost an image, and the sound is there and all other functions are operational, there is a possibility of a malfunction of the LED driver (converter for powering the LTY320HJ01 panel backlight LEDs). When you turn on the TV, the image may appear briefly and disappear immediately. It must be borne in mind that with such manifestations the LEDs themselves also fail.
Often in the absence of backlighting, disassembling the panel is required. It is necessary to check the serviceability of the transitions of the LEDs, as well as the reliability of the contact connections in the rulers and connectors.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source.
We recommend the owners of the KDL-32EX720 TV for repair only to qualified specialists with experience! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
Service manual / schematic diagram -------------------> Sony KDL-32EX720/721/723/724/725/726/727/728/729, KDL-37EX720/723/725, KDL-40EX720/721/723/724/725/726/727/728/729, KDL-46EX720/721/723/724/725/726/727/728/729, KDL-55EX720/721/723/725
UOC: CXD4727GB, Ram. K4B2G1646C-HCH9, Flash: ROM: KFM2GN6Q2B, Audio Amplifier: Y164B, HDMI Controller: Sil9287BCNU, USB 2.0 HUB Controller: GL850G DC/DC: BD95830MUV, DC/DC: PS54425
The appearance of MainBoard 1-883-753-32 is shown in the figure below:1-883-753-32
1-883-753-32 can be used in TVs:
SONY KDL-32CX520 (Panel V315H3-L01), SONY KDL-32EX421 (Panel LTY320AN02), SONY KDL-32EX720 (Panel LTY320HJ01), SONY KDL-40EX521 (Panel LTY400HM08 001), SONY KDL-46EX720 (Panel LTY460HJ05 3D), SONY KDL-46CX520 (Panel LTY460HN01), SONY KDL-40CX521 (Panel LTY400HM07).
The appearance of the power supply
Main features of the device SONY KDL-32EX720:
Installed matrix (LED-panel) LTY320HJ01.
The matrix control uses the Timing Controller (T-CON) EDL.
The LED driver 1-883-300-11 is used to power the backlight LEDs, it is controlled by the BD9276EFV PWM controller. As the power elements of the LED driver, keys of the type R5005CNJ are used.
The formation of the necessary supply voltages for all nodes of the SONY KDL-32EX720 TV is carried out by the APS-312 power module, or its analogues.
MainBoard - the main board (motherboard) is a module 1-883-753-32, using the chips CXD4727GB, K4B2G1646C-HCH9, KFM2GN6Q2B, Y164B, Sil9287BCNU, GL850G, BD95830MUV, PS54425 and others.
The CXD2825GA tuner provides TV reception and channel tuning.
