Technical description and composition of the TV SHARP LC-26D44RU, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-26D44RU -BK
Chassis / Version: QPWBXE449WJN4
Panel: 26 inch unknown
Inverter (backlight): integrated into PSU
PWM Inverter: OZ964
Power Supply (PSU): RUNTKA395WJQZ
PWM Power: DAP005, LD7576PS
MOSFET Power: STP11NK50Z, STP9NK70Z
MainBoard: QPWBXE449WJN4 QKITPE449WJN4 KE449WE01
IC MainBoard: SII9025CTU VL5618, Eagle2 T3Z18AFG, FS49AUG-6NU2
Tuner: TDAG4-B03A
Control: IR: QPWBXE457WJN4 DUNTKE457WE
Technical Specifications LC-26D44RU
SHARP LC-26D44RU
General recommendations for repairing TV LCD
Possible malfunctions
- The SHARP LC-26D44RU TV does not turn on and does not show any signs of operability at all. There is no reaction to the remote control and control buttons from the front panel.
In some of these cases, the main switching power supply, the RUNTKA395WJQZ module, is found to be faulty. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of power switches (STP11NK50Z, STP9NK70Z) of converters and rectifier diodes for possible short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short-circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the main fuse and, less often, the current sensor at the source of the key are most often cut off.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback circuits (OOS) of stabilization. PWM controllers (PWM) DAP005, LD7576PS, if they do not have visible damage to the chassis and open short circuit between the terminals, are usually checked by replacement.
- There is no image, the screen is black, there is sound, with external illumination of the screen, you can sometimes see barely noticeable outlines of the image.
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.After checking all the electrolytic capacitors of the filters that are involved in the power supply to the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
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 QPWBXE449WJN4 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). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - SII9025CTU VL5618, Eagle2 T3Z18AFG, FS49AUG-6NU2 and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
Before changing the tuner TDAG4-B03A, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
Service manual / schematic diagram ----------> SHARP Chassis QPWBXE449WJN4 models LC-26D44E, LC-26D44S, LC-26D44RU, LC-26D44E-BK, LC-26D44S-BK, LC-26D44RU-BK, LC-26D44E-GY, LC-26D44S-GY, LC-26D44RU-GY
Service Manual with Schematic Diagram 136 pages of 2008 for the LC-26D44E, LC-26D44S, LC-26D44RU, LC-26D44E-BK, LC-26D44S-BK, LC-26D44RU-BK, LC-26D44E-GY, LC- 26D44S-GY, LC-26D44RU-GY.
QPWBXE449WJN4
Main features of the SHARP LC-26D44RU device:
Installed matrix (LCD panel) 26 inch unknown.
To power the backlight, a converter is used, combined with a power supply, controlled by the OZ964 PWM controller.
The necessary supply voltages for all nodes of the SHARP LC-26D44RU television are generated by the RUNTKA395WJQZ power supply module or its analogs using DAP005, LD7576PS microchips and power switches of the STP11NK50Z, STP9NK70Z type.
MainBoard - the main board (motherboard) is a QPWBXE449WJN4 module, using SII9025CTU VL5618, Eagle2 T3Z18AFG, FS49AUG-6NU2 and others.
The TDAG4-B03A tuner provides television reception and channel tuning.
models LC-26D44E, LC-26D44S, LC-26D44RU, LC-26D44E-BK, LC-26D44S-BK, LC-26D44RU-BK, LC-26D44E-GY, LC-26D44S-GY, LC-26D44RU-GY
LCD TV SHARP LC-26D44RU with LCD 26, 26 "(66 cm) diagonal 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 1500: 1. Dynamic contrast ratio of 10000: 1 is achieved by controlling the backlight depending on the brightness of the plot.
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 acoustic system of sound 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 x4, S-Video, component, SCART x2, RGB, VGA, HDMI x2, 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, 1360x768.
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 95 watts.
Overall dimensions: with stand 642x498x230 mm, without stand 642x446x94 mm.
TV Weight: with stand: 10.5 kg, without stand: 8.5 kg.
Attention! The 26 inch unknown LCD TV panel SHARP LC-26D44RU is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!
