Technical description and composition of the TV SONY KDL-37S4000, type of panel and applicable modules. The composition of the modules.SONY
Model: KDL-37S4000
Chassis / Version: SE2AG
Panel: T370XW02 V.C
T-CON: 37T03-C04, AUO-11404, T370XW02 VC 37T03-C00 TPS65161 AS15
Inverter (backlight): VIT71060.50
PWM Inverter: OZ964GN (20pin)
Power Supply (PSU): 1-876-636-12 GA3
PWM Power: MCZ3001DB, MIP2H2, FA5501AN (PFC)
MainBoard: 1-876-638-11 BC1
IC MainBoard: TDA9973AHL / 8/12, VCT7593P A1 H802, CXB1444R, 24C32
Tuner: BTF-HF412T
Technical Specifications KDL-37S4000
SONY KDL-37S4000
General recommendations for repairing TV LCD
It is advisable to start the repair and diagnostics of the SONY KDL-37S4000 TV with a careful external examination of the internal and external elements, including case parts, a display, buttons, and cables. In some cases, visible external damage to the elements can suggest directions for troubleshooting and localizing the defect before starting the necessary measurements at the control points of the nodes of electronic circuits. 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 the case when the KDL-37S4000 does not turn on, does not respond to the remote control and buttons on the front panel, does not blink lights and does not show any signs of operability, most likely in this case the GA3 power supply module is faulty. It is advisable to start the troubleshooting of the power supply module by checking the mains fuse. If it is torn, it is necessary to check first of all the power semiconductor elements - rectifier diodes and the power switch of the converter, which are often found in a breakdown state in such situations.
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 cells 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.
In cases using a power module with an active KKM, troubleshooting is sometimes somewhat more complicated.
If the SONY KDL-37S4000 has no 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.
In most cases, the diagnosis and repair of the inverter is difficult due to the organization of protection, which turns it off in emergency cases in order to avoid fires during short circuits or breaks in high voltage circuits and during depressurization of lamps. Often, repairmen block the protection circuits in order to make the necessary measurements at the control points of the inverter to identify the causes of the defect.
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.
The BC1 motherboard must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up continuously. In such cases, if the power supply circuits of the microcircuits are working, a software update may be necessary. Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements TDA9973AHL / 8/12, VCT7593P A1 H802, CXB1444R, 24C32.
If there is no reception of television channels, but the TV works properly from external devices, first of all it is necessary to check the voltage of the BTF-HF412T tuner varicaps, which is usually within 30-33V, as well as other supply voltages on the tuner terminals.
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-26/32/37S4000 chassis SE2AG
PSU / schematic diagram -------------> Sony 1-876-636-11, 1-876-636-12 GA3
The appearance of MainBoard 1-876-638-11 is shown in the figure below:1-876-638-11
1-876-638-11 can be used in televisions:
SONY KDL-26U4000 (Panel LTA260AP01), SONY KDL-32V4000 (Panel LTZ320AA01), SONY KDL-37S4000 (Panel T370XW02 V.C), SONY KDL-37U4000 (Panel T370XW02 VC), SONY KDL-37V4000 (Panel T370XW02 V.C).
The appearance of the power supply
Main features of the device SONY KDL-37S4000:
Installed matrix (LCD panel) T370XW02 V.C.
The matrix control uses the Timing Controller (T-CON) 37T03-C04.
The VIT71060.50 inverter is used to power the backlight, it is controlled by the OZ964GN PWM controller (20pin).
The necessary supply voltages for all nodes of the SONY KDL-37S4000 TV are generated by the power module 1-876-636-12, or its analogs using microchips MCZ3001DB, MIP2H2, FA5501AN (PFC).
MainBoard - the main board (motherboard) is a module 1-876-638-11, using TDA9973AHL / 8/12, VCT7593P A1 H802, CXB1444R, 24C32 and others.
The BTF-HF412T tuner provides television 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