Technical description and composition of the TV SONY KDL-26S2020, type of panel and applicable modules. The composition of the modules.SONY
Model: KDL-26S2020
Chassis / Version: WAX2
Panel: LTY260W2-L16
T-CON: 260W3C4L V2.4
Inverter (backlight): CSN304-00 PCB2680 A06-126290
PWM Inverter: BD9886FV
Power Supply (PSU): APS-220 (CH) 1-468-980-12 G1
PWM Power: MIP2H2, FA5501AN (PFC), CXD9841M
MainBoard: 1-869-852-12 - 172723112
IC MainBoard: S29AL016D70, MSP4400K, M61571AFP, CXA2069Q, MB91305, CXD9199CG, 24C256
Tuner: BTD-HF431Z 1-869-657-12 BE TUE
Control: RM-ED005
Technical Specifications KDL-26S2020
SONY KDL-26S2020
General recommendations for repairing TV LCD
Like any other TV, SONY KDL-26S2020 should start repairing with an external inspection for visible changes in the external and internal elements. Often, for certain external signs, the repairman can draw some conclusions about the reasons for the failure of certain elements of the circuit even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.
In cases where the SONY KDL-26S2020 TV does not turn on, does not respond to the remote control and buttons, any indicators on the front panel do not light up and do not blink and there are no sounds and no signs of operability at all, the G1 APS220 power supply module is most likely to be faulty ( CH) 1-468-980-12 or, which is much less common, there is no processor power on the motherboard. In this case, first of all, it is necessary to check the fuse at the mains input. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the N-FET converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Possible options.
In most cases, a breakdown of the N-Fet converter key does not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible PWM chip MIP2H2, FA5501AN G, CXD9841M from the manufacturer.
It is somewhat more difficult to look for a malfunction in the converter of the power module with an active KKM (power factor corrector).
If when you turn on the SONY KDL-26S2020 there is no image, or it appears for a second and disappears completely, but there is sound, most likely either the backlight or their power converter (inverter) are faulty. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit.
Diagnosis and repair of the inverter is often complicated by the organization of special protection circuits, which is necessary for fire safety and turns off the inverter in any emergency situation, for example, when the lamps are worn or depressurized. Often, to localize a defect, its blocking is required.
In such cases, the risk of failure of the power elements of the inverter is most likely, and special care is required during work, and after their completion, it is necessary to restore the protection circuit for further safe operation of the TV by the owner in normal mode.
In cases of attempts to repair the BE, TUE 1-869-657-12 motherboard, it is necessary to check the operability of the power supply circuits of the microcircuits and, if possible, update the software (software). In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its chips MSP4400K, M61571AFP, CXA2069Q, MB91305, CXD9199CG and other possible faulty components.
The malfunction of the BTD-HF431Z tuner is established after checking the software and all the supply voltages at its terminals, including the varicap supply voltage (30-33V).
Attention to the owners! Attempts at self-repair of the SONY KDL-26S2020 TV are not recommended by the manufacturer and can lead to serious negative consequences!
Service manual / schematic diagram -------------------> Sony KDL-26S2000, KDL-32S2000, KDL-40S2000, KDL-46S2000, KDL-26S2010, KDL-32S2010, KDL-40S2010, KDL-46S2010, KDL-26S2020, KDL-32S2020 CHASSIS WAX2
PSU schematic diagram -------------------> Sony APS-220 Power supply
The appearance of MainBoard 1-869-852-12 is shown in the figure below:1-869-852-12
1-869-852-12 can be used in televisions:
SONY KDL-26S2020 (Panel LTY260W2-L16), SONY KDL-32V2000 (Panel LTZ320WS-LH3).
PSU Advanced
The KDL-26S2020 model uses the APS-220 power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, it is a boost converter based on the FA5501AN PWM controller, which eliminates the charge current of the electrolytic capacitor of the rectifier filter directly from the network through open diodes, when its charging current is determined by its reactance.
As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
The appearance of the power supply
Main features of the device SONY KDL-26S2020:
Installed matrix (LCD panel) LTY260W2-L16.
The matrix control uses the Timing Controller (T-CON) 260W3C4L.
To power the backlight, an inverter CSN304-00 is used, it is controlled by the BD9886FV PWM controller.
The necessary supply voltages for all nodes of the SONY KDL-26S2020 TV are generated by the APS-220 power supply module or its analogs using MIP2H2, FA5501AN (PFC), CXD9841M microcircuits.
MainBoard - the main board (motherboard) is a module 1-869-852-12, using chips S29AL016D70, MSP4400K, M61571AFP, CXA2069Q, MB91305, CXD9199CG, 24C256 and others.
The BTD-HF431Z 1-869-657-12 BE TUE tuner allows you to receive TV programs and tune to channels.
Additional technical information about the panel:
Brand: S-LCD
Model: LTY260W2-L16
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Active Area: 575.769x323.712 mm
Frequency: 60Hz
Lamp Type: CCFL
