SONY
Model: KDL-32V2500
Chassis / Version: WAX2T
Panel: LTZ320WS-LH3
T-CON: 320WSC4LV1.1
Inverter (backlight): PCB2737 A06-126731 B CSN308-00 (32Inch)
Power Supply (PSU): APS-220 B 1-869-132-42 1-468-980-21
PWM Power: MIP2H2, FA5501AN (PFC), CXD9841M
MOSFET Power: 2SK3561, 2SK3934
MainBoard: 1-871-991-21 & 1-869-850-15 (172723015)
IC MainBoard: CPU: NEC D61123F1 100, NAND: HYNIX HY27US08281A
Tuner: 1-869-657-12
Control: IR: 1-870-258-15 (172723015)
Technical Specifications KDL-32V2500
SONY KDL-32V2500
General recommendations for repairing TV LCD
Possible malfunctions
- SONY KDL-32V2500 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 such cases, the malfunction should be sought first in the APS-220 power module. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of power switches (2SK3561, 2SK3934) of converters and rectifier diodes for possible short circuit.
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.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM chips MIP2H2, FA5501AN (PFC), CXD9841M are usually checked by replacing with new ones, or obviously working.
- There is no image, there is sound, it responds to the remote control, the 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 the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply to the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
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 when working, 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 indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the motherboard 1-871-991-21 should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). If it is not possible to replace the MB board (SSB), you need to check the health of its elements - CPU: NEC D61123F1 100, NAND: HYNIX HY27US08281A. Defective components should be replaced.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltages at the terminals of the tuner 1-869-657-12. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
Service manual / schematic diagram -------------------> SONY KDL-32V2500 Chassis WAX2T
The appearance of MainBoard 1-871-991-21 is shown in the figure below:1-871-991-21
1-871-991-21 can be used in TVs:
SONY KDL-46S2530 (Panel LTY460WT-LH3), SONY KDL-40V2500 (Panel 720p HD).
The appearance of the power supply
Main features of the device SONY KDL-32V2500:
Installed matrix (LCD-panel) LTZ320WS-LH3.
The matrix control uses the Timing Controller (T-CON) 320WSC4LV1.1.
A PCB2737 inverter is used to power the backlight.
The necessary supply voltages for all nodes of the SONY KDL-32V2500 TV are generated by the APS-220 power supply module or its analogs using microchips MIP2H2, FA5501AN (PFC), CXD9841M and power switches of the type 2SK3561, 2SK3934.
MainBoard - the main board (motherboard) is a module 1-871-991-21, using CPU chips: NEC D61123F1 100, NAND: HYNIX HY27US08281A and others.
The tuner 1-869-657-12 provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: S-LCD
Model: LTZ320WS-LH3
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA