Technical description and composition of the TV SHARP LC-22LE240RUX, type of panel and applicable modules. The composition of the modules.SHARP LED
Model: LC-22LE240RUX
Panel: 22 inch
LED driver (backlight): 17CON08-2 power supply lines 45v
PWM LED driver: TPS61199
Power Supply (PSU): 17PW80 .3 5v.12v.24v
PWM Power: H1227 / E2T, ICE3BR1765J (Standby), CAT7581 (8)
MOSFET Power: AO4842 (8)
MainBoard: 17MB62-2.6
IC MainBoard: FLASH U158: 25Q808VSIG
Tuner: SUT-RE216TN
Control: RC 1910
Technical Specifications LC-22LE240
SHARP LC-22LE240RUX
General repair guidelines for TV LCD LED
Repair of all electronic devices, including the SHARP LC-22LE240RUX TV, it is advisable to start with an external examination of its external and internal elements. According to some external signs of a change in the state of some elements, it is sometimes possible to make assumptions about the nature of the defect, as well as determine the further direction of the troubleshooting. 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 power supply module 17PW80.3 5v.12v.24v malfunctions, the power supply to the 45v rulers, the external manifestations may be different, for example, the SHARP LC-22LE240RUX does not turn on at all and there is no indication of the indicator lights on the front panel. With the same symptoms, the stabilizer (converter) of the power supply to the control processor may be faulty. It is advisable to start the troubleshooting of the power supply module by checking the state of the electrolytic capacitors of the rectifier filters and the mains fuse. Defective capacitors should be replaced. If the mains fuse is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and transistors, which are often found in such a state of breakdown.
In most cases, key breakdowns in switching power supplies (SMPS) do 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 H1227 / E2T / ICE3BR1765J CAT7581 (8), AO4842 (8) chips from the manufacturer.
In cases where the SHARP LC-22LE240RUX TV lost the image, and the sound is there and all other functions are operational, there is a possibility of a malfunction of the LED driver (converter for powering the panel backlight LEDs). 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.
To check the health of the LEDs, as well as contact connections in the ruler circuit, it is necessary to disassemble the panel.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source.
The motherboard 17MB62-2.6 must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up constantly. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary.
In cases of attempts to repair the MB (SSB) board, it is necessary to check the serviceability of its elements - FLASH U158: 25Q808VSIG which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
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 terminals, as well as the power supply of varicaps (30-33V).
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
Service manual / schematic diagram ------------> LC-22LE240E, LC-22LE240EV, LC-22LE240RU (LC-22LE240X) - 17MB62 CHASSIS.
Service manual / schematic diagram ------------> Sharp LC-32LE140E 17mb62
Service manual / schematic diagram ------------> Power Vestel 17PW80 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 "), 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-22LE240RUX device:
Installed matrix (LED-panel) 22 inches.
The LED driver 17CON08-2 is used to power the backlight LEDs, it is controlled by the TPS61199 PWM controller.
The necessary supply voltages for all nodes of the SHARP LC-22LE240RUX TV are generated by the 17PW80 power module or its analogs using H1227 / E2T, ICE3BR1765J (Standby), CAT7581 (8) microcircuits and AO4842 type power switches (8).
MainBoard - the main board (motherboard) is a 17MB62-2.6 module, using FLASH U158 chips: 25Q808VSIG and others.
The SUT-RE216TN tuner provides TV reception and channel tuning.