Technical description and composition of the SONY KDL-40U2000 TV, panel type and applicable modules. The composition of the modules.SONY
Model: KDL-40U2000
Chassis / Version: SE-1
Panel: LTA400WT-L05
T-CON: 400WSC4LV0.4 - LJ94-01488D
Inverter (backlight): KLS-400W2 Rev0.6
PWM Inverter: BD9886FV (28), BA9201F (14)
MOSFET Inverter: FDD6635 (3), FDD6637 (3)
Trans Inverter: IT-136 071U
Power Supply (PSU): 1-869-027-12 - A1169591D - G2
PWM Power: MIP2H2 (Standby), CXD9841M, FA5501A (PFC)
MainBoard: 1-871-490-11 - 172783611 - A-1202-962-A - I1205695A A1P
IC MainBoard: TDA9974AHS / 8/12, 4776, 14052BG,
Tuner: BTP-HC401 (10)
Control: Remote: RM-ED007, IR: 1-871-493-11 172783611
Technical Specifications KDL-40U2000
SONY KDL-40U2000
General recommendations for repairing TV LCD
Repair SONY KDL-40U2000 must begin with the diagnosis of a malfunction and a thorough inspection of its external and internal components, including those of the body. Often, according to 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. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
Faults in the G2 A-1189-416-A power supply module can be expressed in different ways, for example, the SONY KDL-40U2000 does not turn on at all and the control lamps on its front panel do not light up and do not blink, there are no signs of operability. 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. Options are 2SK3797.
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 defective PWM chips FA5501AN-D1-TE1, MCZ3001DB, MM1431ATT, STR-A6169, TDA7495S from the manufacturer.
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-40U2000 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).
The operation of the power circuits of the inverter and the backlight in the normal mode are controlled by special protection, which is organized for fire safety, for example, to disconnect during short circuits or breaks in high-voltage connections or when the lamps are depressurized. This protection makes it difficult to diagnose and repair the inverter.
All necessary precautions must be observed when disabling the inverter protection during diagnostics and not leaving it disconnected after the repair is completed.
If the BDT, A1P motherboard is faulty, first of all it is necessary to check all the linear power regulators of its chips and, if necessary, update the software. Sometimes you can check the health of MB only by replacement. In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - TDA9974AHS / 8/12, 4776, 14052BG, which may require replacement with new ones.
Before changing the BTP-HC401 tuner (10), if it is not possible to tune to television channels, make sure that there are supply voltages, including varicap supply (30-33V), which must be measured on the corresponding tuner pins.
It should be remembered! Attempts to repair the SONY KDL-40U2000 TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
Service manual / schematic diagram ------------------> Sony KDL-26U2000, KDL-32U2000, KDL-40U2000 CHASSIS SE-1
The appearance of MainBoard 1-871-490-11 is shown in the figure below:1-871-490-11
PSU Advanced
The KDL-40U2000 model uses a G2 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 PWM controller FA5501AN-D1-TE1, 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-40U2000:
Installed matrix (LCD-panel) LTA400WT-L05.
The matrix control uses the Timing Controller (T-CON) 400WSC4LV0.4.
To power the backlight, an inverter KLS-400W2 is used, it is controlled by the PWM controller BD9886FV (28), BA9201F (14). The transformer IT-136 071U is installed in the inverter converter. As power elements of the inverter, keys of the type FDD6635 (3), FDD6637 (3) are used.
The necessary supply voltages for all nodes of the SONY KDL-40U2000 TV are generated by the power module 1-869-027-12, or its analogs using microchips MIP2H2 (Standby), CXD9841M, FA5501A (PFC).
MainBoard - the main board (motherboard) is a module 1-871-490-11, using TDA9974AHS / 8/12, 4776, 14052BG, and others.
Tuner BTP-HC401 (10) provides the reception of television programs and tuning to channels.
Information from an alternative source:
SONY KDL-40U2000 Chassis SE-1
Panel Type (Matrix): LTA400WT-L05
Motherboard: 1-870-688-13, INPUTS: 1-871-490-11
T-con: 400WSC4LV0.4
Invertor: KLS-400W2
PSU: 1-870-686-13, IR Sensor: A-1202-965-A, Key Controller: 1-871-491-11
Remote control: RM-ED007
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA400WT-L05
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
Display Colors: 16.7M (8-bit), CIE1931 72%
Frequency: 60Hz
Lamp Type: CCFL