Technical description and composition of the SONY KDL-32R423A TV, panel type and applicable modules. The composition of the modules.SONY LED
Model: KDL-32R423A
Chassis / Version: RB1FK
Panel: S320DB3-1
LED backlight: SVG320AE1_REV4_130107
T-CON: 320KSB_S2L V0.3 SM4151 DA1308
LED driver (backlight): integrated into PSU
PWM LED driver: BD9488F
MOSFET LED driver: KF5N50FZA
Power Supply (PSU): APS-348 1-888-423-21 - 173429221 - GL3c
PWM Power: BD7677FJ (PFC), MIP2H2 (Standby), CXA3810M (PWM resonant), LV5980MC
MOSFET Power: QM12N70F (PFC), KF5N50FZA
MainBoard: 1P-012CJ01-4010 - FY13_EU - Y200A510A
IC MainBoard: MT5367ZUHU
Tuner: SUT-RE227TN
Control: Remote: RM-ED054, IR: FY13ODM_PP_HF_HIR 1P-112B801-2010
Technical Specifications KDL-32R423A
SONY KDL-32R423A
General repair guidelines for TV LCD LED
Repair of the SONY KDL-32R423A TV should begin with a careful external examination of all its components and modules. Specific external damage to some elements can sometimes indicate further actions to determine the malfunction of the TV and localize the defect before the necessary measurements are taken. Experienced repairmen are often aware of the causes of the defect and the possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
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, it does not make any sounds or any signs of operability when turned on, there is a certain chance that the APS-348 C power supply module is defective 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. 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 a breakdown of the power switch is detected, it should be remembered that in a switching power supply (IIP) it does not fail by itself without any reasons that should be sought by checking other elements of the primary circuit - electrolytic capacitors, a PWM controller, which can only be checked replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
If there is no image when you turn on the SONY KDL-32R423A, or it appears for a second and disappears, but there is sound, most likely there is a malfunction in the backlight LED circuit of the S320DB3-1 panel, or in their power converter. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit.
A malfunction in the backlight circuits often occurs due to a break in the power supply lines of the LED lines. It is necessary to disassemble the panel and check the LEDs themselves, the soldering of their conclusions, as well as the reliability of the connections in the connectors and the soldering of the conclusions of the connectors.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes.
Repair or diagnostics of the Y200A530 motherboard should begin by checking the stabilizers or power converters of its microcircuits. If necessary, you should update the software (software).
If it is not possible to replace the MB (SSB) card, you need to check the health of its elements - MT5367ZUHU. Defective components should be replaced.
The malfunction of the SUT-RE227TN tuner is established after checking the software and all the supply voltages at its terminals, including the varicap supply voltage (30-33V).
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
Service manual / schematic diagram -------------------> Sony KDL-32R420A/421A/423A/424A, KDL-40R470A/471A/473A/474A/470A/473A Chassis RB1FK
PSU / schematic diagram -------------------> Sony ASP-348, ASP-349, ASP-350
The appearance of MainBoard 1P-012CJ01-4010 is shown in the figure below:1P-012CJ01-4010
1P-012CJ01-4010 can be used in TVs:
SONY KDL-32R423A (Panel S320DB3-1), SONY KDL-32R424A (Panel S320DB3-1), SONY KDL-40R473A (Panel S400DH1-3), SONY KDL-40R474A (Panel S400DH1-2), SONY KDL-46R473A (Panel S460DH1-1).
The appearance of the power supply
Main features of the device SONY KDL-32R423A:
Installed matrix (LED-panel) S320DB3-1.
The matrix control uses the Timing Controller (T-CON) 320KSB_S2L.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by a BD9488F PWM controller. As the power elements of the LED driver, keys of the type KF5N50FZA are used.
The necessary supply voltages for all nodes of the SONY KDL-32R423A TV are generated by the APS-348 power module or its analogs using BD7677FJ (PFC), MIP2H2 (Standby), CXA3810M (PWM resonant), LV5980MC and QM12N70F (PFC) power switches KF5N50FZA.
MainBoard - the main board (motherboard) is a 1P-012CJ01-4010 module, using MT5367ZUHU chips and others.
The SUT-RE227TN tuner provides television reception and channel tuning.