Technical description and composition of the SONY KDL-37V4000 TV, panel type and applicable modules. The composition of the modules.SONY
Model: KDL-37V4000
Chassis / Version: SE2AG
Panel: T370XW02 V.C
T-CON: AUO-11401, TPS65161, AS15-F
Inverter (backlight): VIT71060.50
PWM Inverter: 0Z964GN
MOSFET Inverter: P4404EDG
Power Supply (PSU): 1-876-636-11
PWM Power: FA5501AN (PFC), MCZ3001DB, MIP2H2
MOSFET Power: 2SK3797, 2SK3568
MainBoard: 1-876-638-11 A1560389A
IC MainBoard: VCT7593, TDA9973AHL / 8/12, CXA1444R, CXD1978, NJM3414, SIL9021CTU, D61123F1-100, HY27US0828IA
Tuner: BTF-HF412T
Technical Specifications KDL-37V4000
SONY KDL-37V4000
General recommendations for repairing TV LCD
Possible malfunctions
- SONY KDL-37V4000 does not turn on, the indicators on the front panel do not light up and do not blink. The TV does not respond to the control buttons and the remote control.
With such manifestations, the power module 1-876-636-11 usually fails. It is necessary to measure its output voltages and, if they are absent, check the power switches (2SK3797, 2SK3568) and rectifier diodes for the probability of short circuit in the converters.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) FA5501AN (PFC), MCZ3001DB, MIP2H2, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound, it responds to the remote. Or the image appears when you turn it on and immediately disappears
These manifestations can be triggered by the power module, or by inverter defects, as well as by the distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the power supply of the inverter are serviceable, you should make sure that the lamps are in good working condition, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken when working, and the protection circuits should be restored immediately after the repair is completed.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the motherboard 1-876-638-11 should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace 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 - VCT7593, TDA9973AHL / 8/12, CXA1444R, CXD1978, NJM3414, SIL9021CTU, D61123F1-100, HY27US0828IA and replace the failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
Before changing the tuner BTF-HF412T, if it is not possible to tune to television channels, you should make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
One of the typical defects of the SONY KDL-37V4000 TV can occur in the panel T370XW02 V.C.Attention TV owners! Self-repair attempts by SONY KDL-37V4000 are not recommended by the manufacturer and can lead to serious negative consequences!
External manifestations: color distortion in the image as a negative in the image, light tones predominate. Usually in such cases, the AS15-F gamma corrector is faulty. Another indicator of its malfunction is an excessively strong heating, which in practice allows you to do without measuring voltage gradations of gray.
In most cases, replacing the AS15-F solves the problem.
It should be remembered that similar symptoms can cause faults in the column drivers of the panel, which is usually indicated by interference in the form of even vertical stripes on the screen. Then, after replacing the AS15-F, the situation does not change. Drivers are in loops and cannot be replaced. In this case, it is necessary to replace the glass panel.
Service manual / schematic diagram -------------> Sony KDL-26V4000, KDL-32V4000, KDL-37V4000 CHASSIS SE2AG
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-37V4000:
Installed matrix (LCD panel) T370XW02 V.C.
The matrix control uses the AUO-11401 Timing Controller (T-CON).
To power the backlight, an inverter VIT71060.50 is used, it is controlled by a PWM controller 0Z964GN. As power elements of the inverter, keys of the P4404EDG type are used.
The necessary supply voltages for all nodes of the SONY KDL-37V4000 TV are generated by the power module 1-876-636-11, or its analogs using the FA5501AN (PFC), MCZ3001DB, MIP2H2 microchips and power switches of the 2SK3797, 2SK3568 type.
MainBoard - the main board (motherboard) is a module 1-876-638-11, using VCT7593, TDA9973AHL / 8/12, CXA1444R, CXD1978, NJM3414, SIL9021CTU, D61123F1-100, HY27US0828IA 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