Technical description and composition of the TV SHARP LC-37D44RU-BK, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-37D44RU-BK
Panel: LK370T3GW2AY
T-CON: no
Inverter (backlight): RUNTKA497WJQZ
Trans Inverter: ZI358 083IJ
Power Supply (PSU): PSD-0553 RDENCA267WJQZ
MainBoard: KE449WE03 QPWBXE449WJN3
IC MainBoard: VCT 7993P, 24C256
Tuner: AA019WJQZ
Technical Specifications LC-37D44RU
SHARP LC-37D44RU-BK
General recommendations for repairing TV LCD
It is advisable to start diagnosing a malfunction of the SHARP LC-37D44RU-BK TV, like all others, with an external examination of possible changes, both external and internal elements. Often, according to the external signs and the nature of some damage, it is possible to draw preliminary conclusions and determine a further algorithm for finding and localizing a malfunction. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
If the SHARP LC-37D44RU-BK does not turn on, no control lights on the front panel are lit or blinking, therefore, there is a very high probability of a malfunction of the power supply RDENCA267WJQZ. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and, in the event of an open circuit, the reason should be sought in the power semiconductor elements of the pulsed flyback converter of the main PSU. First of all, it is necessary to check the diodes of the bridge of the rectifier of the mains voltage and the power switch of the converter, which can be installed separately on the radiator, or integrated with a PWM controller.
It should be remembered that the N-FET keys used in flyback converters rarely fail for no reason that must be sought by checking other elements of the circuit. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in the resistors in the stabilization circuits. The PWM controller chip can also cause a breakdown of the power switch of the converter.
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 there is no image when you turn on the SHARP LC-37D44RU-BK, or it appears for a second and disappears completely, but there is sound, most likely either the backlight lamps or their power converter (inverter) are faulty. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit.
The operation of the power circuits of the inverter and the backlight in the normal mode are controlled by special protection, which is organized for fire safety, for example, to disconnect during short circuits or breaks in high-voltage connections or when the lamps are depressurized. This protection makes it difficult to diagnose and repair the inverter.
In these cases, special care must be taken in view of the risk of failure of the power elements. After completing all repair work, it is imperative to restore the protection circuits for full and safe further operation of the TV by the user.
It should be remembered! Attempts to repair the TV SHARP LC-37D44RU-BK, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
Service manual / schematic diagram -------------------> Sharp LC-37D44E-BK, LC-37D44S-BK, LC-37D44RU-BK, LC-37D44E-GY, LC-37D44S-GY, LC-37D44RU-GY
Main features of the SHARP LC-37D44RU-BK device:Installed matrix (LCD panel) LK370T3GW2AY.
The matrix control uses the Timing Controller (T-CON) no.
To power the backlight used inverter RUNTKA497WJQZ. The transformer ZI358 083IJ is installed in the inverter converter.
The formation of the necessary supply voltages for all nodes of the SHARP LC-37D44RU-BK TV is carried out by the PSD-0553 power supply module, or its analogs.
MainBoard - the main board (motherboard) is a KE449WE03 module, using VCT 7993P, 24C256 and other chips.
The AA019WJQZ tuner provides TV reception and channel tuning.
LCD TV SHARP LC-37D44RU with LCD LK370T3GW2AY, diagonal size 37 "(94 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 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 standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p.
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 146 watts.
Overall dimensions: with stand 904x637x270 mm, without stand 904x585x95 mm.
TV Weight: with stand: 17 kg, without stand: 14.5 kg.
Attention! The LK370T3GW2AY panel of the SHARP LC-37D44RU 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!