Technical description and composition of the TV SHARP LC-37SD1RU, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-37SD1RU
Chassis / Version: KD890
Panel: LK370T3LZ5BX
Power Supply (PSU): DUNTKD605WE (KD605WE18)
PWM Power: MR4020, TA76431R, TA76431R
MainBoard: KD890 + KD604WE20 (QPWBFD604WJN4)
IC MainBoard: VCT 6973G B3 000 (B3), LPM240T100G5N, DFN9M0637A (B823), SIL9023CTU, 24LC64
Tuner: QPWBND609WJN4
Technical Specifications LC-37SD1RU
SHARP LC-37SD1RU
General recommendations for repairing TV LCD
Possible manifestations of defects
- The SHARP LC-37SD1RU TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
Typically, with such manifestations, the defect is caused by faulty elements in the DUNTKD605WE main power module. Then it is necessary to measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of power switches and rectifier diodes of the converters for a possible short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) MR4020, TA76431R, TA76431R, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- 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.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or the inverter. If all the electrolytic capacitors of the filter for the power supply of the inverter are working, you should make sure the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required when working, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the KD890 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its chips VCT 6973G B3 000 (B3), LPM240T100G5N, DFN9M0637A (B823), SIL9023CTU, 24LC64 and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the tuner QPWBND609WJN4. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
We recommend the owners of the LC-37SD1RU TV for repair only to qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
Service manual / schematic diagram -------------------> SHARP LC-37SD1E, LC-37SD1RU
The appearance of the MainBoard KD890 is shown in the figure below:Kd890
The appearance of the power supply
Main features of the SHARP LC-37SD1RU device:
Installed matrix (LCD panel) LK370T3LZ5BX.
The necessary supply voltages for all nodes of the SHARP LC-37SD1RU television are generated by the DUNTKD605WE power module or its analogs using MR4020, TA76431R, and TA76431R microcircuits.
MainBoard - the main board (motherboard) is a KD890 module, using VCT 6973G B3 000 (B3), LPM240T100G5N, DFN9M0637A (B823), SIL9023CTU, 24LC64 and others.
The tuner QPWBND609WJN4 provides the reception of television programs and tuning to channels.
LCD TV SHARP LC-37SD1RU with LCD, diagonal size 37 "(94 cm) in 16: 9 format. Brightness of the screen glow 450 cd / m² is organized by backlighting with CCFL fluorescent lamps (EEFL). Contrast, as the ratio of maximum brightness to minimum not less than 1200: 1.
You can view images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i.
The power of the sound speaker system 20 W (2x10 W) provide two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x3, S-Video, SCART x2, RGB, VGA, HDMI, RS-232. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768.
A digital tuner is capable of receiving television channels in DVB-T standards.
Overall dimensions: with stand 926x703x305 mm, without stand 926x644x119 mm.
TV Weight: with stand: 22.8 kg, without stand: 20.1 kg.
Attention! The LCD TV panel SHARP LC-37SD1RU is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!