Technical description and composition of the TV SONY KLV-40BX401, type of panel and applicable modules. The composition of the modules.SONY
Model: KLV-40BX401
Chassis / Version: AZ-1A
Panel: LTY400HM01 A05 // T400HW03 V.6
T-CON: FHD_MB4_C2LV1.4 E88441 431-9
Inverter (backlight): SSI400_10A01 // VIT71880.10 Rev: 1
PWM Inverter: SSI091ASN (24) // OZ964SN (20)
MOSFET Inverter: MDD1752 (3) // P4004ED. P2904BD
Trans Inverter: U400S32 U400S34
Power Supply (PSU): APS-254 G2
PWM Power: CXA3809M (PFC & PWM resonant), MIP2H2 (DIP-7 Standby)
MOSFET Power: K4096
MainBoard: BAA board A-1757-166-A (A1757166A) A1757169A
IC MainBoard: Scaler MT5388GFMG, audio TPA3110D2, flech K9F1208UOC, DC-DC: 95503
Tuner: TEQE8-L01A
Control: RM-GA019
Appearance
SONY KLV-40BX401
General recommendations for repairing TV LCD
It is advisable to start the repair and diagnostics of the SONY KLV-40BX401 TV with a careful external examination of the internal and external elements, including case parts, a display, buttons, and cables. Any external damage can sometimes prompt the repairman to take further steps to determine the malfunction of the TV and localize the defect. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when turned on, there is a certain chance that the G2 APS-254 power supply module is defective and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of processor power, but this happens much less often. 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. K4096 variants are possible.
In most cases, a breakdown of the N-Fet converter key does not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM MIP2H2 (7n) from the manufacturer.
If an active Power Factor Corrector (PFC) is used in the power module circuitry, it is sometimes more difficult to troubleshoot. Knowledge, experience, intuition and skills in such cases have a great advantage for a successful repair.
If the SONY KLV-40BX401 does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction of the display backlight, or their power converter - inverter. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the inverter itself, including in the secondary rectifier of the main PSU.
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.
When diagnosing with the protection off, special precautions must be taken, because there is a risk of failure of the power elements of the inverter. After the diagnosis, it is imperative to restore the protection circuits for the inverter to operate normally.
Repair or diagnostics of the BAA A-1757-166-A (A1757166A) A1757169A motherboard should be started by checking the power conditioners. If necessary, you should update the software (software).
If you suspect a malfunction of the TEQE8-L01A tuner, first of all, you need to make sure that the voltage of the varicaps (30-33V) is present on the corresponding output of the tuner, as well as other voltage supplying it.
Remember! Attempts to self-repair by users of the SONY KLV-40BX401 TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
Service / Schematic manual -----------------> Sony KLV-22BX300, KLV-26BX300, KLV-32BX300, KLV-40BX400 Chassis AZ1-A
Service / Schematic manual -----------------> APS-252, APS-253, APS-254 Power supply
The appearance of the MainBoard BAA is shown in the figure below:BAA
BAA can be used in TVs:
SONY KLV-22BX300 (Panel T216XW01 V.3), SONY KLV-22BX301 (Panel 22 "), SONY KLV-26BX301 (Panel V260B3-L05 Rev.C1), SONY KLV-26NX400 (Panel V260B3-L05 Rev.C1), SONY KLV-32BX300 (Panel LTY320AP04), SONY KLV-32BX301 (Panel LTY320AP05 006), SONY KLV-32NX500 (Panel T315HW04 V.0), SONY KLV-40BX400 (Panel LTZ400HM01 A13), SONY KLV-40BX401 (Panel LTY400HM01 A05 ), SONY KLV-32EX300 (Panel LTY320AP04), SONY KLV-40NX500 (Panel T400HW03 v.0).
PSU Advanced
The KLV-40BX401 model uses the APS-254 power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, it is a boost converter based on the CXA3809M & PWM resonant PWM controller, which eliminates the charge current of the rectifier filter's electrolytic capacitor directly from the network through open diodes when its charging current is determined by its reactance.
As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
The appearance of the power supply
Main features of the device SONY KLV-40BX401:
Installed matrix (LCD panel) LTY400HM01 A05 or T400HW03 V.6.
The matrix control uses the Timing Controller (T-CON) FHD_MB4_C2LV1.4.
To power the backlight, an SSI400_10A01 inverter is used, it is controlled by the PWM controller SSI091ASN (24) // OZ964SN (20). The transformer U400S32 U400S34 is installed in the inverter converter. As power elements of the inverter, keys of the type MDD1752 (3) // P4004ED are used. P2904BD.
The necessary supply voltages for all nodes of the SONY KLV-40BX401 TV are generated by the APS-254 power module or its analogs using CXA3809M (PFC & PWM resonant), MIP2H2 (DIP-7 Standby) microcircuits and K4096 type power switches.
MainBoard - the main board (motherboard) is a BAA module using Scaler MT5388GFMG chips, audio TPA3110D2, flech K9F1208UOC, DC-DC: 95503 and others.
The TEQE8-L01A tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: S-LCD
Model: LTY400HM01
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 885.6x498.15 mm
Surface: Antiglare (Haze 7%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 1.07B (8-bit + Hi-FRC), CIE1931 72%
Response Time: 12/8 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: 10 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (2 ch, 10-bit), 51 pins
Voltage: 12.0V
