Technical description and composition of the SONY KLV-40BX400 TV, panel type and applicable modules. The composition of the modules.SONY
Model: KLV-40BX400
Chassis / Version: AZ-1 5-2
Panel: LTZ400HM01 A13
T-CON: E88441
Inverter (backlight): SSI400_10A01 Rev0.4
PWM Inverter: SSI091ASN
MOSFET Inverter: APM4018N
Trans Inverter: C U400S34
Power Supply (PSU): APS-254 G2HE A-1752-780-A
PWM Power: CXA3809M (PFC & PWM resonant), MIP2H2 (DIP-7 Standby)
MOSFET Power: 16N50C3 K4096
MainBoard: BAA board A-1784-340-A
IC MainBoard: MT5388GF MG, TPA3110D2, H5PS5162FFR, K9F1208UOC
Tuner: TEQE8-L01A
Control: Remote: RM-GA019, IR 1-880-416-11 (1-731-165-1)
Technical Specifications KLV-40BX400
SONY KLV-40BX400
General recommendations for repairing TV LCD
It is advisable to start diagnosing a malfunction of the SONY KLV-40BX400 TV, like all others, with an external examination of possible changes, both external and internal elements. 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. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in solders will help the master to guess the causes and possible consequences of the malfunction.
In the case when the KLV-40BX400 does not turn on, does not respond to the remote control and the front panel buttons, does not blink light bulbs and does not show any signs of operability, most likely in this case the APS-254 G2HE A-1752-780-A power supply module is faulty. In this case, the diagnosis and repair of the common power supply should always be started by checking the mains fuse. When it breaks, it is advisable to check for a breakdown, first of all, all power semiconductor elements of the converter and the diode bridge of the network rectifier, as well as the large electrolytic capacitor of the filter of the network rectifier and the key transistor 16N50C3 K4096.
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 MIP2H2 (7) CXA3809M can also cause a breakdown of the power switch of the converter.
It is somewhat more difficult to look for a malfunction in the converter of the power module with an active KKM (power factor corrector).
If the SONY KLV-40BX400 TV does not have an image, but there is sound, the malfunction should be sought in the power converter of the backlight (inverter). It is also necessary to check the serviceability of the electrolytic capacitors of the filter of the secondary rectifiers of the PSU (power supply) for an overstated ESR.
When repairing the SSI400_10A01 Rev0.4 inverter, it is often necessary to disable protection for diagnostics, which, for the purpose of fire safety, turns it off in any emergency situation, for example, during a malfunction or uneven wear of the lamps, which makes it difficult to find a defect.
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.
In cases of attempts to repair the BAA A-1784-340-A motherboard, it is necessary to check the operability of the power supply circuits of the microcircuits and, if possible, update the software (software). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - TPA3110D2 A0066A with new or obviously good ones.
If the TV works normally from external devices, but does not tune into television channels, the TEQE8-L01A tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals, as well as the power supply of varicaps (30-33V).
Owners and users of the SONY KLV-40BX400 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-22BX300, KLV-26BX300, KLV-32BX300, KLV-40BX400 Chassis AZ1-A
Service / Schematic manual -----------------> APS-252, APS-253, APS-254 Power supply
Service Manual 112 pages of 2010 for the KLV-22BX300, KLV-26BX300, KLV-32BX300, KLV-40BX400
2. Service Manual 39 pages of 2010 on the KLV-32BX300, KLV-40BX400
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-40BX400 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-40BX400:
Installed matrix (LCD panel) LTZ400HM01 A13.
The matrix control uses the Timing Controller (T-CON) E88441.
To power the backlight, an SSI400_10A01 inverter is used, it is controlled by the SSI091ASN PWM controller. A transformer C U400S34 is installed in the inverter converter. As power elements of the inverter, keys of the APM4018N type are used.
The necessary supply voltages for all nodes of the SONY KLV-40BX400 TV are generated by the APS-254 power module or its analogs using CXA3809M (PFC & PWM resonant), MIP2H2 (DIP-7 Standby) microcircuits and 16N50C3 K4096 power switches.
MainBoard - the main board (motherboard) is a BAA module, using microchips MT5388GF MG, TPA3110D2, H5PS5162FFR, K9F1208UOC and others.
The TEQE8-L01A tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: S-LCD
Model: LTZ400HM01
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
Lamp Type: WLED