Technical description and composition of the TV SONY KDL-40S2000, type of panel and applicable modules. The composition of the modules.SONY
Model: KDL-40S2000
Chassis / Version: WAX2
Panel: LTY400WS-L02
Inverter (backlight): D0656437CA d0658258CA PCB2676, PCB2677 A06-126268, A06-126269
PWM Inverter: BD9886FV (28 pin) LM2901 (14 pin)
Power Supply (PSU): 1-869-027-12 - A1169591D G2
PWM Power: FA5501AN (PFC), CXD9841M, MIP2H2
MOSFET Power: RSS065 (8H) PL
MainBoard: 1-869-850-12
IC MainBoard: LM393DT, MB91305, BD9775FV
Tuner: BTD-HF431Z - 1-869-657-12 - 172714612 - CFE-050-TUE-08
Technical Specifications KDL-40S2000
SONY KDL-40S2000
General recommendations for repairing TV LCD
It is reasonable to start the repair of the SONY KDL-40S2000 TV with a careful external inspection before proceeding to the diagnosis of the malfunction. It is advisable to carefully internal and external components. It often happens that some damage to elements or connections will help determine the correct direction of troubleshooting and localization of the defect. Experienced repairmen are often aware of the causes of the defect and possible consequences, for example, by ring cracks in the soldering of the leads of the elements, as well as by swollen capacitors or resistors burnt to coal dust and other external indirect signs.
In the absence of any signs of operability, when the SONY KDL-40S2000 does not turn on and does not signal anything with the control lights on the panel, the G2 power module is most likely faulty. When diagnosing and repairing the G2 power supply, it is necessary first of all to check the fuse, and if it breaks, you should check the power switch RSS065 (8n) pl and rectifier bridge diodes for avalanche (thermal) breakdown.
As a rule, the keys of flyback converters, which use an N-Fet field effect transistor on a separate radiator, or integrated with a FA5501AN, CXD9841M, MIP2H2 PWM controller in a single chip, are quite reliable and rarely fail for no reason. The reasons for the breakdown of the key should be sought by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is checked by replacing it with a known good one.
When using an active Power Factor Correction (CMC) circuit in the power module, the search for faulty elements is somewhat more complicated.
Sometimes the SONY KDL-40S2000 TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the backlight converter, or of the lamps themselves, which can be checked by replacement. In such cases, it is necessary to verify the serviceability of all electrolytic capacitors of the filter according to the power supply of the inverter itself, including in the power supply unit (power supply unit).
Diagnostics and repair of the inverter are 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.
Diagnosis and repair of the BE motherboard is carried out by checking the performance of power stabilizers or updating the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - LM393DT, MB91305, BD9775FV and replace failed chips with new ones.
Before changing the BTD-HF431Z tuner, if it is not possible to tune to television channels, make sure that there are supply voltages, including varicap power (30-33V), which must be measured on the corresponding tuner pins.
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-26S2000, KDL-32S2000, KDL-40S2000, KDL-46S2000, KDL-26S2010, KDL-32S2010, KDL-40S2010, KDL-46S2010, KDL-26S2020, KDL-32S2020 CHASSIS WAX2
The appearance of MainBoard 1-869-850-12 is shown in the figure below:1-869-850-12
1-869-850-12 can be used on TVs:
SONY KDL-40S2000 (Panel LTY400WS-L02), SONY KDL-40S2010 (Panel LTZ400WS-L02 ).
PSU Advanced
The G2 power module is made using the Power Factor Correction (PFC) scheme to eliminate multiple AC harmonics introduced into the power supply by the device. The PFC node is a Step-Up Converter based on the FA5501AN PWM controller, which evenly distributes high-frequency pulses of the charging current of the electrolytic capacitor of the rectifier filter of the mains voltage over a period of 50 Hz. The current of its charge in this case will already be determined not by its reactance (usually 10-30 ohms for the network frequency), but by the elements of the converter. As a result, a change in the amplitude of the pulses (envelope) of the consumed current of the converter will repeat the shape and phase of the input sinusoidal voltage. The availability of an increased voltage (about + 380V) in the operating mode on the capacitor of the line filter indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the device SONY KDL-40S2000:
Installed matrix (LCD-panel) LTY400WS-L02.
To power the backlight, the inverter D0656437CA is used, it is controlled by the BD9886FV PWM controller (28 pin) LM2901 (14 pin).
The necessary supply voltages for all nodes of the SONY KDL-40S2000 TV are generated by the power module 1-869-027-12, or its analogs, using FA5501AN (PFC), CXD9841M, MIP2H2 microcircuits and power switches of the type RSS065 (8n) pl.
MainBoard - the main board (motherboard) is a module 1-869-850-12, using microchips LM393DT, MB91305, BD9775FV and others.
Tuner BTD-HF431Z - 1-869-657-12 - 172714612 - CFE-050-TUE-08 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: S-LCD
Model: LTY400WS-L02
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1366x768, WXGA
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 885.168x497.664 mm
Surface: Antiglare (Haze 44%), Hard coating (3H)
Brightness: 530 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 10/6 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: 20 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 41 pins
Voltage: 5.0V