Technical description and composition of the TV SONY KDL-40U2520, type of panel and applicable modules. The composition of the modules.SONY
Model: KDL-40U2520
Chassis / Version: SE-1
Panel: LTA400WT-L05
T-CON: 400WSC4LV0.4
Inverter (backlight): LJ97-00860A
Power Supply (PSU): 1-870-686-13 A-1189-416-A G2 BOARD
PWM Power: FA5501AN (PFC), MCZ3001DB, MM1431ATT, STR-A6169, TDA7495S
MainBoard: 1-872-686-11 A-1242-773-A BDTR-2 BOARD
IC MainBoard: TDA9974AHS / 8/12, HY27US0828A1, LVC541A G841325, 4776, PA8718, LVX8053, LVXT4053
Tuner: FSS BTP-HC401
Control: RM-ED007
Technical Specifications KDL-40U2520
SONY KDL-40U2520
General recommendations for repairing TV LCD
Repair of electronic equipment usually begins with an external inspection of the device and diagnosis of the malfunction. In this case, you should visually carefully examine all the elements of the SONY KDL-40U2520 TV, both internal and external. Visible damage to elements can sometimes suggest further directions for finding a defect before starting the necessary measurements. Ring cracks in the soldering of the leads of the heating elements, swollen electrolytic capacitors, a charred paint layer on the resistors - all this for the repairman can be a hint in the assumptions about the causes and consequences of the malfunction.
In cases where the SONY KDL-40U2520 TV does not turn on, does not respond to the remote control and buttons, no indicators on the front panel light up or blink and there are no sounds and no signs of operability when turning on, the A-1189 power supply module is most likely faulty -416-A G2 BOARD or, which is much less common, there is no processor power on the motherboard. The diagnostics of the power supply should always be started by checking the fuse and, if it is broken, it is first necessary to check the rectifier bridge diodes and the power switch for the possibility of an avalanche or thermal breakdown.
The reasons for the breakdown of the power switch of the flyback converter of the power module can be different, for example, a malfunction of semiconductor elements or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM controller chip or breakage of the resistors in its bundle.
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 the SONY KDL-40U2520 does not have an image, but there is sound and the TV is controlled by the remote control, a malfunction in the display backlight nodes is likely. The lamps or the power converter - inverter may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the inverter, and check the LCD lamps by connecting external and obviously serviceable for diagnosis to the connectors.
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.
Turning off the protection for diagnostic purposes, it must be remembered that in this case there is a risk of failure of the power elements of the inverter. Upon completion of the diagnosis, all regular protection circuits should be restored.
Repair of the motherboard A-1247-116-A A1P BOARD, * A-1242-773-A BDTR-2 BOARD must begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
In cases where there is no tuning to the local television channels, you should make sure that there is a varicap supply voltage (30-33V) and other supply voltages at the terminals of the FSS BTP-HC401 tuner.
Owners and users of the SONY KDL-40U2520 TV must remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
Service manual / schematic diagram ------------------> Sony KDL 32/40U2520 chassis SE-1
The appearance of MainBoard 1-872-686-11 is shown in the figure below:1-872-686-11
1-872-686-11 can be used in televisions:
SONY KDL-26P2530 (Panel T315XW02 V1), SONY KDL-32P2520 (Panel T315XW02 V.1.), SONY KDL-32P2530 (Panel T315XW02 V.1), SONY KDL-40P2530 (Panel LTA400WT-L05 1-802-386-21), SONY KDL-40U2520 (Panel LTA400WT-L05), SONY KDL-40U2530K (Panel LTA400WT-L05).
The appearance of the power supply
Main features of the device SONY KDL-40U2520:
Installed matrix (LCD-panel) LTA400WT-L05.
The matrix control uses the Timing Controller (T-CON) 400WSC4LV0.4.
To power the backlight used inverter LJ97-00860A.
The necessary supply voltages for all nodes of the SONY KDL-40U2520 TV are generated by the power module 1-870-686-13, or its analogs using microchips FA5501AN (PFC), MCZ3001DB, MM1431ATT, STR-A6169, TDA7495S.
MainBoard - the main board (motherboard) is a module 1-872-686-11, using TDA9974AHS / 8/12, HY27US0828A1, LVC541A G841325, 4776, PA8718, LVX8053, LVXT4053 and others.
The FSS BTP-HC401 tuner provides television reception and channel tuning.
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