Technical description and composition of the TV SONY KLV-37S550A, type of panel and applicable modules. The composition of the modules.SONY
Model: KLV-37S550A
Chassis / Version: EX2T
Panel: T370XW02 v.c
T-CON: T370XW02 37T03-C04 AUO
Inverter (backlight): VIT71865.50 vit71861.50 LOGAH rev3
PWM Inverter: OZ964GN
MOSFET Inverter: P2504BDG
Power Supply (PSU): 3H267W-2 G4T
PWM Power: A6079 (7), SSC9503 (16)
MainBoard: BT22T A1707715B
IC MainBoard: TDA15420E / N1C00, MB90F334APMCGE1, CXB1444R-T6
Tuner: TEQE3-L02A
Control: RM-GA016
Technical Specifications KLV-37S550A
SONY KLV-37S550A
General recommendations for repairing TV LCD
Repair of a SONY KLV-37S550A TV is advisable to start with an external inspection of all its constituent elements, both internal electronic components and external. Inspection is also subject to body elements, control buttons, screen, connectors and cords. Any external damage can sometimes prompt the repairman to take further steps to determine the malfunction of the TV and localize the defect. Experienced repairmen are often aware of the causes of the defect and the possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
In the case when the KLV-37S550A does not turn on, does not respond to the remote control and the front panel buttons, does not blink bulbs and does not show any signs of operability, most likely in this case the 3H267W-2 G4T power module is faulty. In this case, first of all, it is necessary to check the fuse at the input of the network. 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.
It should be remembered that the N-FET keys used in flyback converters rarely fail for no reason that must be sought by checking other elements of the circuit. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in the resistors in the stabilization circuits. The PWM controller chip A6079 (7) SSC9503 (16) can also cause a breakdown of the power switch of the converter.
If the power module uses an active KKM circuit (power factor control), troubleshooting is somewhat more complicated.
If the SONY KLV-37S550A does not have an image, but there is sound, there is a possibility of a malfunction of the backlight or power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working.
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, special care should be taken during diagnostics, and after completion of all repair work, it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software).
Owners and users of the SONY KLV-37S550A 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 / Schematic manual -----------------> Sony KLV-26S550A KLV-32S530A KLV-32S550A KLV-37S550A/L/T CHASSIS EX2T KLV-26S550A, KLV-32S530A, KLV-32S550A, KLV-32S550A/L, KLV-32S550A/T, KLV-37S550A.
The appearance of the MainBoard BT22T is shown in the figure below:BT22T
BT22T can be used in TVs:
SONY KLV-22S570A (Panel T216XW01), SONY KLV-26S550A (Panel T260XW02 V.Q), SONY KLV-37S550A (Panel T370XW02 v.c).
Main features of the device SONY KLV-37S550A:
Installed matrix (LCD panel) T370XW02 v.c.
The matrix control uses the Timing Controller (T-CON) T370XW02.
The VIT71865.50 inverter is used to power the backlight lamps, it is controlled by the OZ964GN PWM controller. As power elements of the inverter, keys of the type P2504BDG are used.
The necessary supply voltages for all nodes of the SONY KLV-37S550A TV are generated by the 3H267W-2 power supply module or its analogs using A6079 (7) and SSC9503 (16) microcircuits.
MainBoard - the main board (motherboard) is a BT22T module, using TDA15420E / N1C00 chips, MB90F334APMCGE1, CXB1444R-T6 and others.
The TEQE3-L02A tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T370XW02 VC02
Type: a-Si TFT-LCD, Panel
Diagonal size: 37 inch
Resolution: 1366x768, WXGA
Display Mode: AMVA, Normally Black, Transmissive
Active Area: 819.6x460.8 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V