Technical description and composition of the TV SHARP LC-40LE240RUX, type of panel and applicable modules. The composition of the modules.SHARP LED
Model: LC-40LE240RUX
Chassis / Version: 17MB62 VESTEL
Panel: LTA400HM13 C04
T-CON: 400HR42S4LV0A MAX9695, 24C64WP, LOF6041T08-01, SM4109 DA1219
LED driver (backlight): SSL400 0E2B REV0.1
Power Supply (PSU): 17PW07-2
PWM Power: FAN7621 (PWM resonant), FAN7529 (PFC), FSDL321 (Standby), NCP1579 (Step-Down)
MOSFET Power: FQPFN50C, AO4842
MainBoard: 17MB62-2.6
Tuner: SUT-RE216TN
Control: RC1910
Appearance
SHARP LC-40LE240RUX
General repair guidelines for TV LCD LED
Repair of the TV SHARP LC-40LE240RUX should begin with the diagnosis of a malfunction, which involves a careful examination of the external and internal elements of the device. Often, based on certain external signs, it may be possible to draw certain conclusions about the reasons for the failure of certain elements of the circuit even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing 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.
In the absence of any signs of operability, when the SHARP LC-40LE240RUX does not turn on and does not signal anything with the control lights on the panel, there is a possibility of a malfunction of the 17PW07-2 power supply module of the TV. With the same manifestations, the power regulator of the control processor on the motherboard may be faulty. When diagnosing and repairing the power supply, first of all, replace the swollen filter capacitors of the secondary rectifiers and check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module — rectifier diodes and transistors in the primary circuit.
Power switches in pulsed power supplies (SMPS) fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The cause may be a malfunction of the PWM controller chip, which can only be checked by replacing it with a new or obviously working one.
In cases where the SHARP LC-40LE240RUX TV lost the image, and the sound is there and all the other functions are functional, there is a possibility of a malfunction of the LED driver (converter for powering the backlight LEDs of the LTA400HM13 C04 panel). When you turn on the TV, the image may appear briefly and disappear immediately. It must be borne in mind that with such manifestations the LEDs themselves also fail.
A malfunction in the backlight circuits often occurs due to an open in the power circuit of the LED lines. It requires disassembling the panel and checking the LEDs themselves, the soldering of their outputs, as well as the reliability of the connections in the connectors and the soldering of the conclusions of the connectors.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
Repair or diagnostics of the 17MB62-2.6 motherboard should begin by checking the stabilizers or power converters of its microcircuits. If necessary, you should update the software (software).
Before replacing the SUT-RE216TN tuner, if there is no tuning to the channels, you must first check the supply voltage at its terminals, including the varicap supply (30-33V).
Attention to users! Self-repair of a TV SHARP LC-40LE240RUX without the appropriate qualifications and experience can lead to its complete non-repairability!
Service manual / schematic diagram -----------------------------> Sharp LC-32LE140E 17mb62
psu / schematic diagram -----------------------------> Power Vestel 117PW07-2 Schematic diagram
The appearance of the MainBoard 17MB62-2.6 is shown in the figure below:The 17MB62-2.6 motherboard is made using the MSD9WB9PT-2 processor, combined with a scaler. For its operation, random-access memory (DDR) K4T1G164QF, or HY5PS121621C, and NAND512-A read-only memory (ROM) are used. To ensure processor power, DC / DC converters with output voltages of 1.2V, 2.5V, 3.3V are used. For DDR, the voltage is 1.8V, for NAND it is either 1.8 or 3.3V. It is advisable to start the repair by checking the supply voltage in stand-by mode (12V), 5V and 3.3V. Further, in the operating mode, it is necessary to check the operability of all linear stabilizers and DC / DC voltage converters used to power the MB and LCD panel chips. If there is a backlight and no image, depending on the type of panel used, its 5V or 12V power supply can be measured directly on the LVDS connector.
A typical malfunction of this board is a NAND software failure. At the same time, the TV does not turn on and blinks alternately with indicators on the panel. If the software of the SPI FLASH chip, in which the bootloader is located, is not damaged, NAND is updated via the USB port with standard software. Otherwise, it makes sense to try downloading the software if there is a mboot.bin file on the media, which can be used as standard SPI FLASH content.
17MB62-2.6 can be used in TVs:
PHILIPS 19PFL2908H/60 (Panel HT185WX1-300), PHILIPS 22PFL2807H/60 (Panel LM215WF4 (TL)(G1)), PHILIPS 24PFL2908H/60 (Panel V236BJ1-LE1 Rev.C2), PHILIPS 22PFL2908H/60 (Panel M215HGE-L21 ), SHARP LC-22LE240RUX (Panel 22 дюйма), SHARP LC-40LE240RUX (Panel LTA400HM13 C04), SHARP LC-32LE140RU LC-32LE140 (Panel LC320EXN), TOSHIBA 23KL934R (Panel LTM230HT10 75029655), TOSHIBA 32KL934R (Panel LTA320AN12 T01).
PSU Advanced
The 17PW07-2 power supply module is made using the Power Factor Correction (PFC) scheme to eliminate multiple AC harmonics introduced into the power supply by the device. The PFC assembly is a Step-Up Converter based on the FAN7529 PWM controller, which evenly distributes high-frequency pulses of the charging current of the electrolytic capacitor of the rectifier filter of the mains voltage over a period of 50 Hz. The current of its charge in this case will already be determined not by its reactance (usually 10-30 ohms for the network frequency), but by the elements of the converter. As a result, a change in the amplitude of the pulses (envelope) of the consumed current of the converter will repeat the shape and phase of the input sinusoidal voltage. The availability of an increased voltage (about + 380V) in the operating mode on the capacitor of the line filter indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the SHARP LC-40LE240RUX device:
Installed matrix (LED-panel) LTA400HM13 C04.
The matrix control uses the Timing Controller (T-CON) 400HR42S4LV0A.
The LED driver SSL400 is used to power the backlight LEDs.
The necessary supply voltages for all nodes of the SHARP LC-40LE240RUX TV are generated by the 17PW07-2 power supply module or its analogs using FAN7621 (PWM resonant), FAN7529 (PFC), FSDL321 (Standby), NCP1579 (Step-Down) microcircuits and power switches type FQPFN50C, AO4842.
MainBoard - the main board (motherboard) is a 17MB62-2.6 module.
The SUT-RE216TN tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA400HM13
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
Brightness: 400 cd / m²
Contrast Ratio: 4000: 1
Display Colors: 16.7M (8-bit), CIE1931 70%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V