Technical description and composition of the TV SHARP LC-32LE140RU, type of panel and applicable modules. The composition of the modules.SHARP LED
Model: LC-32LE140RU LC-32LE140
Chassis / Version: 17MB62
Panel: LC320EXN
T-CON: LC320EXN 6870C-0370A
LED driver (backlight): 6917L-0072A PPW-LE32GD-O B REV0.1
PWM LED driver: BD9262EFV
MOSFET LED driver: DB31AB
Power Supply (PSU): 17PW07-2
PWM Power: FAN7621 (PWM resonant), FAN7529 (PFC), FSDL321 (Standby), NCP1579 (Step-Down)
MOSFET Power: FQPFN50C, A04842
MainBoard: 17MB62-2.6
IC MainBoard: TPA3113D2, LD1117AL, 25Q80BVS10, 9EBR 158 (6), ZV23t (6), RT8293AH (8), 3503MP-G1 (8), ALCBF (6)
Tuner: SUT-RE216TN
Technical Specifications LC-32LE140
SHARP LC-32LE140RU
General repair guidelines for TV LCD LED
Possible manifestations of defects
- SHARP LC-32LE140RU does not turn on and does not show any signs of operability at all. Does not blink indicators and does not respond to control buttons.
In such cases, the fault should be sought first in the 17PW07-2 power supply module. It is then necessary to measure its output voltages and, if they are absent, check the power switches (FQPFN50C, A04842) and the rectifier diodes of the converters for a short-circuit probability.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers FAN7621 (PWM resonant), FAN7529 (PFC), FSDL321 (Standby), NCP1579 (Step-Down), in the absence of visible damage or frank short-circuit between the terminals, are checked by replacing with new, or obviously working.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
As a rule, in such cases there is no display backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect the probes in the forward direction to it (red probe to the anode, black to the cathode). In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the 17MB62-2.6 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuits and matrix. If necessary, update or replace the software (software). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - TPA3113D2, LD1117AL, 25Q80BVS10, 9EBR 158 (6), ZV23t (6), RT8293AH (8), 3503MP-G1 (8), ALCBF (6) with new ones or obviously working. In cases where BGA technologies are used, defects are usually localized by the heating method.
If the TV works normally with external devices, but does not tune into television channels, the SUT-RE216TN tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Owners and users of the SHARP LC-32LE140RU television 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 -----------> SHARP LC-32LE140E, LC-32LE140EV, LC-32LE140EK, LC-32LE140RU Chassis 17MB62
Service Manual with Schematic Diagram 88 pages of 2011 for the LC-32LE140E, LC-32LE140EV, LC-32LE140EK, LC-32LE140RU.
To reduce the backlight current in LED drivers with the BD9262EFV controller, the total resistance of the resistors from terminal 23 (ISET) to the housing should be proportionally increased.Repair MainBoard
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 "), SHARP LC-40LE240RUX (Panel LTA400HM13 C04), SHARP LC-32LE140RU LC-32LE140 (Panel LC320EXN), TOSHIBA 23KL934R (Panel LTM230HT10 75029655), TOSHIBA 32KL934R (Panel LTA320AN12 T01).
The appearance of the power supply
Main features of the SHARP LC-32LE140RU device:
Installed matrix (LED-panel) LC320EXN.
The matrix control uses the Timing Controller (T-CON) LC320EXN.
The LED driver 6917L-0072A is used to power the backlight LEDs, it is controlled by the BD9262EFV PWM controller. As power elements of the LED driver, keys of the DB31AB type are used.
The necessary supply voltages for all nodes of the SHARP LC-32LE140RU TV are generated by the 17PW07-2 power module or its analogs using FAN7621 (PWM resonant), FAN7529 (PFC), FSDL321 (Standby), NCP1579 (Step-Down) microcircuits and power switches type FQPFN50C, A04842.
MainBoard - the main board (motherboard) is a 17MB62-2.6 module, using TPA3113D2, LD1117AL, 25Q80BVS10, 9EBR 158 (6), ZV23t (6), RT8293AH (8), 3503MP-G1 (8), ALCBF (6) microcircuits ) and others.
The SUT-RE216TN tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC320EXN-SDP1
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 10%), Hard coating (2H)
Brightness: 380 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 68%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
