Technical description and composition of the TV SHARP LC-26SD1RU, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-26SD1RU
Chassis / Version: KD890
Panel: LK260T3LF14 A31K1D26RJ
T-CON: X3509TP ZB
Inverter (backlight): RDENC2267TPZ D
PWM Inverter: BD9777 (SOP-20)
Power Supply (PSU): DUNTKD605WE - KD605WE18 // KD605WE12
PWM Power: MR4020, MR4030
MOSFET Power: TPC8110, RSS085, C5103
MainBoard: KD890 KD890WE14
IC MainBoard: VCT6973, SIL9021, BR24L64F, IXB832WJ, TDA8931T
Tuner: TD1613AF / IVP3
Technical Specifications LC-26SD1RU
SHARP LC-26SD1RU
General recommendations for repairing TV LCD
Repair SHARP LC-26SD1RU must begin with the diagnosis of the malfunction and a thorough inspection of its external and internal components, including the case. Visible damage to elements can sometimes suggest further directions for finding a defect before starting the necessary measurements. Experienced repairmen are often aware of the causes of the defect and the possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
In cases where the SHARP LC-26SD1RU TV does not turn on, does not respond to the remote control and buttons, any indicators on the front panel do not light up and do not blink, and there are no sounds and no signs of operability at all, the power module is most likely faulty or, what it happens much less often - there is no processor power on the motherboard. It is advisable to start the troubleshooting of the power supply module by checking the mains fuse. In the event that it is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and the power switch of the TPC8110 RSS085 C5103 converter, which are often found in breakdown conditions in such situations.
It should be remembered that in the practice of repair, usually the power keys of N-Fet converters do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the BD9777 EZ22A 224 MCR621 PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
Diagnostics of power modules with a Power Factor Corrector (CMC) is somewhat more complicated and requires a more detailed approach.
In cases where the SHARP LC-26SD1RU TV has lost an image, and the sound is there and all the other functions are operational, there is a possibility of a malfunction of the inverter (converter for powering the backlight). When you turn on the TV, the image may appear briefly and immediately disappear. It must be borne in mind that with such manifestations, the lamps themselves also fail, the malfunction of which can be detected by replacement, by connecting to the connectors for diagnostics that are known to be serviceable and suitable in power.
Diagnosis and repair of the inverter is often complicated by the organization of special protection circuits, which is necessary for fire safety and turns off the inverter in any emergency situation, for example, when the lamps are worn or depressurized. Often, to localize a defect, its blocking is required.
Turning off the protection for diagnostic purposes, it must be remembered that in this case there is a risk of failure of the inverter power elements. Upon completion of the diagnosis, all regular protection circuits should be restored.
Attention to users! Self-repair of a TV SHARP LC-26SD1RU without the appropriate qualifications and experience can lead to its complete non-repairability!
Service manual / schematic diagram --------------> Sharp LC-26SD1E, LC-26SD1RU, LC-32SD1E, LC-32SD1RU
Service Manual with Schematic Diagram 144 pages 2006 model LC-26SD1E, LC-26SD1RU, LC-32SD1E, LC-32SD1RU.
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-26SD1RU device:
Installed matrix (LCD panel) LK260T3LF14 A31K1D26RJ.
The matrix control uses the Timing Controller (T-CON) X3509TP.
The RDENC2267TPZ inverter is used to power the backlight, controlled by the BD9777 PWM controller (SOP-20).
The necessary supply voltages for all nodes of the SHARP LC-26SD1RU TV are generated by the DUNTKD605WE power module or its analogs using MR4020, MR4030 microcircuits and power switches of the TPC8110, RSS085, C5103 type.
MainBoard - the main board (motherboard) is a KD890 module, using VCT6973, SIL9021, BR24L64F, IXB832WJ, TDA8931T and others.
The TD1613AF / IVP3 tuner provides television reception and channel tuning.
LCD TV SHARP LC-26SD1RU with LCD, diagonal size 26 "(66 cm) in 16: 9 format. The brightness of the screen is 450 cd / m² by CCFL (EEFL) fluorescent lamps. 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.
The power consumed by the TV from the network in operating mode is 109 watts.
Overall dimensions: with stand 672x560x270 mm, without stand 672x501x137 mm.
TV Weight: with stand: 15.4 kg, without stand: 13.2 kg.
Attention! The LCD TV panel SHARP LC-26SD1RU is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!