Technical description and composition of the TV SHARP LC-20AD5RU-BK, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-20AD5RU-BK
Panel: LK200T3LZ10
T-CON: CPWBX3335, EAGLE2
Inverter (backlight): RDENC2228TPZZ
PWM Inverter: Z594
MOSFET Inverter: RSS070, RSS080
Power Supply (PSU): CEF300B-4
PWM Power: FA5541A
MainBoard: CMF112C
IC MainBoard: VCT6973G, 24C64WP, SII9025CTV, LA42052,
Tuner: TDTG-S156D
Control: GA455WJSA
Technical Specifications LC-20AD5RU
SHARP LC-20AD5RU-BK
General recommendations for repairing TV LCD
Like any other TV, it is advisable to start repairing the SHARP LC-20AD5RU-BK with an external inspection of the visible changes in the external and internal elements. It often happens that some damage to elements or connections will help determine the correct direction of troubleshooting and localization of the defect. Ring cracks in the soldering of the leads of the heating elements, swollen electrolytic capacitors, a charred paint layer on the resistors - all this for the repairman can be a hint in the assumptions about the causes and consequences of the malfunction.
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when it is turned on, there is a certain chance that the CEF300B-4 power module is defective and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of processor power, but this happens much less often. The diagnostics of the power supply should always be started by checking the fuse and, if it is broken, it is first necessary to check the rectifier bridge diodes and the power switch for the possibility of an avalanche or thermal breakdown.
Power switches in flyback converters fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The reason may be a malfunction of the 5541A PWM controller chip, which can only be checked by replacing it with a new or obviously working one.
If an active Power Factor Corrector (CMC) is used in the power module circuitry, it can sometimes become more difficult to troubleshoot. Knowledge, experience, intuition and skills in such cases have a great advantage for a successful repair.
Sometimes the SHARP LC-20AD5RU-BK TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the backlight converter, or of the lamps themselves, which can be checked by replacement. In such cases, it is necessary to verify the serviceability of all electrolytic capacitors of the filter according to the power supply of the inverter itself, including in the power supply unit (power supply unit).
Repair of the RDENC2228TPZZ inverter can often be somewhat complicated by the use of special protection circuits, which are designed to disconnect it in emergency cases for fire safety when the lamps are depressurized, or short circuits or breaks in high-voltage circuits and connections. Sometimes it becomes necessary for diagnostic purposes to block the protection circuits to be able to make the necessary measurements at the control points of the circuit.
It should be remembered that in such cases there is a risk of failure of the power elements of the inverter and to take special care. After carrying out repairs, the protection circuit must be restored for further safe operation of the TV.
Repair of the CMF112C motherboard should begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM. In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - VCT6973G, 24C64WP, SII9025CTV, LA42052, with new or obviously working ones.
The TDTG-S156D tuner malfunction is established after checking the software and all the supply voltages at its terminals, including the varicap supply voltage (30-33V).
Remember! Attempts to self-repair by users of the SHARP LC-20AD5RU-BK TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
schematic / manual -------------------> Sharp LC-20AD5E-BK
Main features of the SHARP LC-20AD5RU-BK device:Installed matrix (LCD panel) LK200T3LZ10.
The matrix control uses the Timing Controller (T-CON) CPWBX3335.
The RDENC2228TPZZ inverter is used to power the backlight, controlled by the Z594 PWM controller. As power elements of the inverter, keys of the type RSS070, RSS080 are used.
The necessary supply voltages for all nodes of the SHARP LC-20AD5RU-BK TV are generated by the CEF300B-4 power supply module or its analogs using FA5541A microcircuits.
MainBoard - the main board (motherboard) is a CMF112C module, using VCT6973G, 24C64WP, SII9025CTV, LA42052, and others.
The TDTG-S156D tuner provides TV reception and channel tuning.
LCD TV SHARP LC-20AD5RU with LCD LK200T3LZ10, diagonal size 20 "format 16: 9. The brightness of the screen 450 cd / m² is organized by backlight fluorescent lamps CCFL (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 system 4 W (2x2W) 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, component, 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, 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 84 watts.
Overall dimensions: with stand 522x395x225 mm, without stand 522x360x103 mm.
TV mass: with stand: 7.3 kg, without stand: 6.5 kg.
Attention! The LK200T3LZ10 panel of an SHARP LC-20AD5RU LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!