Technical description and composition of the SONY KDL-40V4000 TV, panel type and applicable modules. The composition of the modules.SONY
Model: KDL-40V4000
Chassis / Version: EG1L-L
Panel: LTY400HA06
T-CON: FS HBC2LV2.4
Inverter (backlight): integrated into PSU & SSB400W20S01 Rev0.5
Power Supply (PSU): 1-876-467-12 A-1548231-A
PWM Power: MIP2H2 (Stb), CXD9841P (PWM), MAX232N (PFC), LX1692BIDW (HV)
MOSFET Power: 2SK3569, 2SK3561, 2SK3934
MainBoard: 1-877-114-11 A-1545-599-A
IC MainBoard: CPU: MB90F334A, NAND128W3A28N6, EEPROM: 24C32; RAM: HY825DC256160CE
Control: IR: 1-876-417-11 A-1494-139-A
Technical Specifications KDL-40V4000
SONY KDL-40V4000
General recommendations for repairing TV LCD
Possible manifestations of defects
- The SONY KDL-40V4000 TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
Typically, with such manifestations, the defect is caused by faulty elements in the main power module 1-876-467-12. It is necessary to measure its output supply voltages, and in case of their absence, check the operability of power switches (2SK3569, 2SK3561, 2SK3934) of converters and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually 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 the excess of maximum current or voltage values. 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) MIP2H2 (Stb), CXD9841P (PWM), MAX232N (PFC), LX1692BIDW (HV), 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 reacts to the remote control. 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. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of the transformers for an open.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the motherboard 1-877-114-11 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 - CPU: MB90F334A, NAND128W3A28N6, EEPROM: 24C32; RAM: HY825DC256160CE and failed chips replace with new ones. Some malfunctions can be associated with the use of BGA soldering technologies in modern Main Board. Typically, such defects are detected by local heating of the chip.
Owners and users of the SONY KDL-40V4000 TV should 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-40V4000 Chassis EG1L-L
The appearance of MainBoard 1-877-114-11 is shown in the figure below:1-877-114-11
The appearance of the power supply
Main features of the device SONY KDL-40V4000:
Installed matrix (LCD panel) LTY400HA06.
The matrix control uses the Timing Controller (T-CON) FS.
To power the backlight, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the SONY KDL-40V4000 TV are generated by the power module 1-876-467-12, or its analogs using microchips MIP2H2 (Stb), CXD9841P (PWM), MAX232N (PFC), LX1692BIDW (HV) and power keys of type 2SK3569, 2SK3561, 2SK3934.
MainBoard - the main board (motherboard) is a module 1-877-114-11, using CPU chips: MB90F334A, NAND128W3A28N6, EEPROM: 24C32; RAM: HY825DC256160CE and others.
Additional technical information about the panel:
Brand: S-LCD
Model: LTY400HA06
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive