Technical description and composition of the TV SHARP LC-32X20RU, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-32X20RU
Panel: LK315D3LZ20Y
T-CON: CPWBX3830TP
Inverter (backlight): RUNTKA332WJZZ (75)
Power Supply (PSU): RDENCA230WJQZ DPS-204CPA Rev: S3F
PWM Power: DLA001DTR, L6562DTR (PFC), TNY264PN
MOSFET Power: 2SK3569,10N60
MainBoard: DUNTKE237WE - QPWBXE237WJN2 - RAV4138; DUNTKE238WE RAV3238
IC MainBoard: MP2367DN; R2S15502; S29GL128; Sii9185 +; TAS3102D; TPS40055; YDA147SZ
Control: GA586WJSA
Technical Specifications LC-32X20RU
SHARP LC-32X20RU
General recommendations for repairing TV LCD
Repair of the SHARP LC-32X20RU TV is better to begin with a thorough external inspection and diagnosis of the malfunction. It is advisable to carefully examine the internal and external components. In some cases, visible external damage to the elements can suggest directions for troubleshooting and localizing the defect before starting the necessary measurements at the control points of the nodes of electronic circuits. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.
Malfunctions of the power supply module RDENCA230WJQZ DPS-204CPA Rev: S3F can be expressed differently, for example, the SHARP LC-32X20RU does not turn on at all and the control lamps on its front panel do not light up and do not blink, and there are no signs of operability. 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.
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 chip from the manufacturer.
When using the Active Power Factor Correction (CMC) circuitry in the power module, the search for faulty elements is somewhat 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 supplying the inverter should be checked.
Often, attempts to repair the DUNTKA332WJZZ inverter are complicated by the fact that the fault diagnosis is complicated by the operation of its protection, which is designed to turn off the inverter in emergency conditions - when the lamps are depressurized, breaks or short circuits in high-voltage connections and other emergency situations. Lock protection to localize the defect is popular among repairmen.
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.
It should be remembered! Attempts to repair the SHARP LC-32X20RU TV, 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-32X20E, LC-32X20S, LC-32X20RU, LC-37X20E, LC-37X20S, LC-37X20RU
The power module RDENCA230WJQZ is installed on the LC-32X20RU TV using the PFC (Power Factor Correction) scheme acting as an active filter to eliminate the higher harmonic components of the current consumption. The boost converter based on the L6562DTR PWM controller does not allow the input rectifier filter's electrolytic capacitor to be connected to the network directly through open diodes when the charge current determines its reactance (of the order of 15-30 ohms at a frequency of 50 Hz). As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current will repeat the phase and shape of the sine wave of the input voltage. The health check of the PFC unit is carried out by measuring the DC voltage on the capacitor of the rectifier network. In operating mode, it should be around 380V, in standby approximately 300V.Main features of the SHARP LC-32X20RU device:
Installed matrix (LCD panel) LK315D3LZ20Y.
The matrix control uses the Timing Controller (T-CON) CPWBX3830TP.
The RUNTKA332WJZZ inverter (75) is used to power the backlight.
The necessary supply voltages for all nodes of the SHARP LC-32X20RU television are generated by the RDENCA230WJQZ power supply module or its analogs using DLA001DTR, L6562DTR (PFC), TNY264PN microcircuits and 2SK3569,10N60 type power switches.
MainBoard - the main board (motherboard) is a DUNTKE237WE module, using MP2367DN chips; R2S15502; S29GL128; Sii9185 +; TAS3102D; TPS40055; YDA147SZ and others.
LCD TV SHARP LC-32X20RU with LCD LK315D3LZ20Y, 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 2000: 1. Dynamic contrast ratio of 10000: 1 is achieved by controlling the backlight depending on the brightness of the plot.
The design and technical capabilities of the TV include watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphical decomposition according to the standard 1080p (Full HD). 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 x3, 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, 1280x1024, 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 132 watts.
Overall dimensions: with stand 776x572x276 mm, without stand 776x517x95 mm.
TV Weight: with stand: 18 kg, without stand: 15 kg.
Attention! The LK315D3LZ20Y panel of the SHARP LC-32X20RU 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!