Technical description and composition of the TV SHARP LC-26SA1RU, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-26SA1RU
Chassis / Version: KD890
Panel: LK260T3LF14
T-CON: X3509TP
Inverter (backlight): RDENC2267TPZ D (7lamp)
PWM Inverter: BD9777 (SOP-20)
Power Supply (PSU): QPWBSD605WJN5 DUNTK605WE
PWM Power: MR4030, MR4020
MOSFET Power: C5103, TPC8110 (8) RSS085 (8)
MainBoard: KD890 KD890WE12
IC MainBoard: VCT 6973G B3 000 (B3), LPM240T100G5N, DFN9M0637A (B823), SIL9023CTU, 24LC64
Tuner: DUNTKD608WE
Technical Specifications LC-26SA1RU
SHARP LC-26SA1RU
General recommendations for repairing TV LCD
Any repair of electronic equipment begins with an external inspection of the device and diagnosis of the malfunction. In this case, you should visually carefully examine all the elements of the SHARP LC-26SA1RU TV, both internal and external. Visible damage to elements can sometimes suggest further directions for finding a defect before starting the necessary measurements. Electrolytic capacitors of filters with a swollen casing, as well as ring cracks formed in the soldered leads of heating elements, or a layer of coal on burnt resistors sometimes tell the repairman the causes of the malfunction and possible consequences.
In the case when the LC-26SA1RU does not turn on, does not respond to the remote control and the front panel buttons, does not blink bulbs and does not show any signs of operability, most likely in this case the QPWBSD605WJN5 DUNTK605WE power module is faulty. When diagnosing and repairing the power supply, first of all, it is necessary to 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 or power switch C5103 (pl) TPC8110 (pl) 8n RSS085 (8n) pl.
In most cases, a breakdown of the N-Fet converter key does 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 BD9777 (20) pl EZC8 224 MRC616 (14) pl from the manufacturer.
It is somewhat more difficult to look for a malfunction in the converter of the power module with an active KKM (power factor corrector).
If, when you turn on the TV, the image appears and immediately disappears, or is initially absent when you turn on, but there is sound and other functions work, there is a high probability of a malfunction of the inverter (power converter for the backlight). In such cases, the lamps, the inverter and the common power module are subject to verification, in which the electrolytic capacitors of the rectifier filter feeding the inverter should be checked.
Diagnostics of the inverter RDENC2267TPZ D (7lamp) can be difficult due to the operation of the protection, which is organized by the designers to prevent negative consequences or fires in emergency cases, for example, during short circuits or breaks in the lamp power supply circuit, as well as their possible leakage. To make the necessary measurements at control points or to take the necessary waveforms, repairmen have to block the protection circuits in order to be able to diagnose.
All necessary precautions must be observed when disabling the inverter protection during diagnostics and not leaving it disconnected after the repair is completed.
Repair or diagnostics of the KD890WE12 motherboard should be started by checking the power conditioners. If necessary, you should update the software (software).
If there is no reception of television channels, but the TV works properly from external devices, first of all it is necessary to check the voltage of the tuner DUNTKD608WE, which is usually in the range 30-33V, as well as other supply voltages on the terminals of the tuner.
Attention to users! Self-repair of a TV SHARP LC-26SA1RU without the appropriate qualifications and experience can lead to its complete non-repairability!
Service manual / schematic diagram -------------> Sharp LC-26SA1E, LC-26SA1RU, LC-32SA1E, LC-32SA1RU
Service Manual with Schematic Diagram 164 year 2006 model LC-26SA1E, LC-26SA1RU, LC32SA1E, LC32SA1RU.
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-26SA1RU device:
Installed matrix (LCD panel) LK260T3LF14.
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-26SA1RU TV are generated by the QPWBSD605WJN5 power supply module or its analogs using MR4030, MR4020 microcircuits and power switches of the type C5103, TPC8110 (8) RSS085 (8).
MainBoard - the main board (motherboard) is a KD890 module, using VCT 6973G B3 000 (B3), LPM240T100G5N, DFN9M0637A (B823), SIL9023CTU, 24LC64 and others.
The DUNTKD608WE tuner provides television reception and channel tuning.
LCD TV SHARP LC-26SA1RU with LCD, diagonal size 26 "(66 cm) in 16: 9 format. The brightness of the screen is 450 cd / m² 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.
The power consumed by the TV from the network in operating mode is 102 watts.
Overall dimensions: with stand 672x560x270 mm, without stand 672x501x137 mm.
TV Weight: with stand: 15.2 kg, without stand: 13 kg.
Attention! The LCD TV panel SHARP LC-26SA1RU is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!