Technical description and composition of the TV SHARP LC-32D44RU-BK, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-32D44RU-BK LC-32D44RU
Panel: LK315T3GW30Y
Inverter (backlight): RUNTKA396WJQZ
PWM Inverter: BD9883
Power Supply (PSU): RUNTKA396WJQZ
PWM Power: FA5500AN (PFC), TNY276PN (Standby)
MOSFET Power: 2SK4096 (2 pcs.)
MainBoard: QPWBXE449WJN2
IC MainBoard: VCT7993P, 24C64
Tuner: TDAG4-B03A
Control: Remote: GA591WJSA, IR DUNTKE457WE QPWBXE457WJN1
Technical Specifications LC-32D44RU
SHARP LC-32D44RU-BK
General recommendations for repairing TV LCD
Like any other TV, it is advisable to start repairing the SHARP LC-32D44RU-BK with an external examination of the visible changes in the external and internal elements. Any external damage can sometimes prompt the repairman to take further steps to determine the malfunction of the TV and localize the defect. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in solders will help the master to guess the causes and possible consequences of the malfunction.
Malfunctions of the RUNTKA396WJQZ power module can be expressed in different ways, for example, the SHARP LC-32D44RU-BK does not turn on at all and the control lamps on its front panel do not light up and do not blink, there are no signs of operability. In this case, the diagnosis and repair of the common power supply should always be started by checking the mains fuse. When it breaks, it is advisable to check for a breakdown, first of all, all power semiconductor elements of the converter and the diode bridge of the network rectifier, as well as a large electrolytic capacitor of the filter of the network rectifier and a key transistor 2SK4096 (2 pcs.).
If a breakdown of the power switch of the flyback converter of the power supply unit is detected, it should be remembered that it does not fail without any reasons that should be sought by checking other elements of the primary circuit - electrolytic capacitors, PWM controller FA5500AN - PFC, TNY276PN - PWM BP DR, which You can check only by replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
In cases where the Power Factor Corrector (PFC) is used in the power supply, troubleshooting can be a bit more complicated.
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.
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.
If the QPWBXE449JN2 motherboard is faulty, first of all it is necessary to check all the linear power regulators of its chips and, if necessary, update the software. Sometimes you can check the health of MB only by replacement.
Attention to the owners! Attempts at self-repair of the SHARP LC-32D44RU-BK TV are not recommended by the manufacturer and can lead to serious negative consequences!
Service manual / schematic diagram --------------> Sharp LC-32D44E-BK, LC-32D44S-BK, LC-32D44RU-BK, LC-32D44E-GY, LC-32D44S-GY, LC-32D44RU-GY LC-32D44E-BK, LC-32D44S-BK, LC-32D44RU-BK, LC-32D44E-GY, LC-32D44S-GY, LC-32D44RU-GY.
The appearance of the MainBoard QPWBXE449WJN2 is shown in the figure below:QPWBXE449WJN2
PSU Advanced
The model LC-32D44RU-BK uses the RUNTKA396WJQZ power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, it is a step-up converter based on the FA5500AN PWM controller, which eliminates the charge current of the electrolytic capacitor of the rectifier filter directly from the network through open diodes when its charging current is determined by its reactance.
As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
The appearance of the power supply
Main features of the SHARP LC-32D44RU-BK device:
Installed matrix (LCD panel) LK315T3GW30Y.
To power the backlight, the RUNTKA396WJQZ inverter is used, controlled by the BD9883 PWM controller.
The necessary supply voltages for all nodes of the SHARP LC-32D44RU-BK TV are generated by the RUNTKA396WJQZ power supply module or its analogs using FA5500AN (PFC), TNY276PN (Standby) microcircuits and 2SK4096 power switches (2 pcs.).
MainBoard - the main board (motherboard) is a QPWBXE449WJN2 module, using VCT7993P, 24C64 and others.
The TDAG4-B03A tuner provides television reception and channel tuning.
LCD TV SHARP LC-32D44RU with LCD LK315T3GW30Y, diagonal size 32 "(81 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.
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 120 watts.
Overall dimensions: with stand 776x575x230 mm, without stand 776x523x95 mm.
TV Weight: with stand: 13 kg, without stand: 11 kg.
Attention! The LK315T3GW30Y panel of the SHARP LC-32D44RU 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!
