Technical description and composition of the SONY KLV-40V550A TV, panel type and applicable modules. The composition of the modules.SONY
Model: KLV-40V550A
Chassis / Version: EX2L
Panel: LTY400HA12
T-CON: E88441 NP_HAC2LV1.1
Inverter (backlight): SSB400W12S01 Rev0.1 DARFON
MOSFET Inverter: 2903 (8)
Trans Inverter: 119N C956E
Power Supply (PSU): IP1 board A-1660-720-B - IP1 1-878-598-11
PWM Power: CXD9969P (PWM Resonant), MIP2H2 (Standby)
MainBoard: 1-878-942-12 BA board
IC MainBoard: CPU: MC10147F1 410, MB91F313A, NAND Flash: K9F1208UOC, EEPROM: 24C32
Tuner: BTFBG442T 8-597-708-00
Control: RM-GA015
Technical Specifications KLV-40V550A
SONY KLV-40V550A
General recommendations for repairing TV LCD
It is advisable to start the repair and diagnostics of the SONY KLV-40V550A 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. 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 IP1 A1660720B 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. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and, in the event of a break, the cause should be sought in the power semiconductor elements of the pulsed flyback converter of the main PSU. First of all, it is necessary to check the diodes of the bridge of the rectifier of the mains voltage and the power switch of the converter, which can be installed separately on the radiator, or integrated with a PWM controller.
If a breakdown of the power switch of the flyback converter of the power supply unit is detected, it should be remembered that it does not fail without any reasons that should be sought by checking other elements of the primary circuit - electrolytic capacitors, PWM controller MIP2H2 (8). CXD9969P (16), which can only be checked by replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
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 when you turn on the SONY KLV-40V550A there is no image, or it appears for a second and disappears completely, but there is sound, most likely either the backlight or their power converter (inverter) are faulty. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit.
Often, attempts to repair an SSB400W12S01 Rev0.1 DARFON inverter are hampered by the fact that the diagnosis of the malfunction is complicated by the operation of its protection, which is designed to turn off the inverter in emergency conditions - when the lamps are depressurized, breaks or short circuits in high-voltage connections and other emergency situations. Lock protection to localize the defect is popular among repairmen.
All necessary precautions must be observed when disabling the inverter protection during diagnostics and not leaving it disconnected after the repair is completed.
The BAX2L 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.
If the TV works normally from external devices, but does not tune into television channels, the BTFBG442T 8-597-708-00 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).
Once again, remind users! Attempts to self-repair a SONY KLV-40V550A TV without the appropriate qualifications and experience can lead to its complete non-repairability!
Service / Schematic manual -----------------> Sony KLV-32V530A, 32V550A/R/W, 40V530A 40V550A/R/W, 46V550A, 52V550A, CHASSIS EX2L KLV-32V530A, KLV-32V550A, KLV-32V550A/R, KLV-32V550A/W, KLV-40V530A, KLV-40V550A, KLV-40V550A/R, KLV-40V550A/W, KLV-46V550A, KLV-52V550A
The appearance of MainBoard 1-878-942-12 is shown in the figure below:1-878-942-12
1-878-942-12 can be used on TVs:
SONY KDL-46V5500 (Panel LTY460HB11), SONY KLV-32V550A (Panel LTY320HA03 A06), SONY KLV-40V550A (Panel LTY400HA12), SONY KLV-52V550A (Panel LTY520HB11), SONY KDL-46V5610 (Panel LTY460HB10), SONY KDL-32V5610 (Panel LTY320HA02), SONY KDL-32V5500 (Panel LTY320HA02).
The appearance of the power supply
Main features of the device SONY KLV-40V550A:
Installed matrix (LCD-panel) LTY400HA12.
The matrix control uses the Timing Controller (T-CON) E88441.
To power the backlight used inverter SSB400W12S01. A transformer 119N C956E is installed in the inverter converter. As power elements of the inverter, keys of type 2903 (8) are used.
The necessary supply voltages for all nodes of the SONY KLV-40V550A TV are generated by the IP1 power supply module or its analogs using CXD9969P (PWM Resonant), MIP2H2 (Standby) microcircuits.
MainBoard - the main board (motherboard) is a module 1-878-942-12, using CPU chips: MC10147F1 410, MB91F313A, NAND Flash: K9F1208UOC, EEPROM: 24C32 and others.
The BTFBG442T 8-597-708-00 tuner provides reception of television programs and tuning to channels.