Technical description and composition of the SONY KDL-32U4000 TV, panel type and applicable modules. The composition of the modules.SONY
Model: KDL-32U4000
Chassis / Version: SE2AG
Panel: LK315T3LA3S
T-CON: CPWBN RUNTK 4024TP ZA
Inverter (backlight): RDENC2562TPZZ REV: 06A DAC-24T067 BF
Power Supply (PSU): 1-876-635-12 A1556796A
PWM Power: MCZ3001DB, MIP2H2, PQ1CG203
MOSFET Power: K3568, 2SC3052EF-T
MainBoard: 1-876-638-11
IC MainBoard: VCT7593, TDA9973AHL / 8/12, CXA1444R, CXD1978, NJM3414, SIL9021CTU, D61123F1-100, HY27US0828IA
Tuner: BTF-HF412T
Control: IR: 1-877-115-11 (172988011)
Technical Specifications KDL-32U4000
SONY KDL-32U4000
General recommendations for repairing TV LCD
Possible malfunctions
- SONY KDL-32U4000 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.
In some of these cases, the main switching power supply, module 1-876-635-12, is faulty. Then we recommend that you measure its output voltages and, if they are absent, you should check the health of the power switches (K3568, 2SC3052EF-T) and rectifier diodes of the converters for probable short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke the excess of maximum current or voltage values. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) MCZ3001DB, MIP2H2, PQ1CG203, in the absence of external damage and a short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, there is sound, it reacts to the remote control, channels are switched. In some cases, the image appears when you turn on and immediately disappears.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or inverter. If all the electrolytic capacitors of the filter according to the power supply of the inverter are working, make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the motherboard 1-876-638-11 should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). Sometimes it is necessary to check or replace (if necessary) the elements of the MainBoard board - VCT7593, TDA9973AHL / 8/12, CXA1444R, CXD1978, NJM3414, SIL9021CTU, D61123F1-100, HY27US0828IA. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
If the TV works normally from external devices, but does not tune into television channels, the BTF-HF412T tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Once again, remind users! Attempts to self-repair a SONY KDL-32U4000 TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!
Service manual / schematic diagram -------------------> SONY KDL-32U4000 Chassis SE2AG
The appearance of MainBoard 1-876-638-11 is shown in the figure below:1-876-638-11
1-876-638-11 can be used in televisions:
SONY KDL-26U4000 (Panel LTA260AP01), SONY KDL-32V4000 (Panel LTZ320AA01), SONY KDL-37S4000 (Panel T370XW02 V.C), SONY KDL-37U4000 (Panel T370XW02 VC), SONY KDL-37V4000 (Panel T370XW02 V.C).
The appearance of the power supply
Main features of the device SONY KDL-32U4000:
Installed matrix (LCD panel) LK315T3LA3S.
The matrix control uses the Timing Controller (T-CON) CPWBN.
To power the backlight used inverter RDENC2562TPZZ.
The necessary supply voltages for all nodes of the SONY KDL-32U4000 TV are generated by the power module 1-876-635-12, or its analogs using microchips MCZ3001DB, MIP2H2, PQ1CG203 and power switches of the type K3568, 2SC3052EF-T.
MainBoard - the main board (motherboard) is a module 1-876-638-11, using VCT7593, TDA9973AHL / 8/12, CXA1444R, CXD1978, NJM3414, SIL9021CTU, D61123F1-100, HY27US0828IA and others.
The BTF-HF412T tuner provides television reception and channel tuning.