Technical description and composition of the TV SHARP LC-42RD2RU, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-42RD2RU
Panel: R1T420XW01 ++ A
Inverter (backlight): 4HV1838.371 / C2, 4HV1838.381 / C2
PWM Inverter: OZ964SN (20), 393 (8), 358 (8), 324 (14), 4427YM (8), 78M12
MOSFET Inverter: P2804ND5G (5) 10pcs
Trans Inverter: 4004Q73J D02 of 10pcs
Power Supply (PSU): DPS-268AP B - RDENCA209WJQZ
PWM Power: L6562D (PFC), DAP011 (Standby), DLA001DTR (PWM Push-pull)
MainBoard: DUNTKD981FM03, DUNTKD628FM18, PSLDMA898WJFW, RTUNQA035WJZZ, DUNTKD604FM26
IC MainBoard: IXB680WJ, BU4228G, TC7SHU04FU, MP1583
Tuner: DUNTKD984FM01, PAE2-806 M116P
Control: GA572WJSA
Technical Specifications LC-42RD2RU
SHARP LC-42RD2RU
General recommendations for repairing TV LCD
Any repair of electronic equipment begins with an external inspection of the device and diagnostics of the malfunction. In this case, you should visually carefully examine all the elements of the SHARP LC-42RD2RU TV, both internal and external. 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. Swollen electrolytic or cermet capacitors, charred resistors, ring cracks in the soldered terminals of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
If the LC-42RD2RU does not turn on, does not respond to the remote control and the front panel buttons, does not blink light bulbs and does not show any signs of operability, most likely in this case the power supply module RDENCA209WJQZ DPS-268AP B, is faulty. In this case, first of all, it is necessary to check the fuse at the input of the network. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the N-FET converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Possible options.
It should be remembered that in the practice of repair, usually the power keys of N-Fet converters do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
When using a power factor correction unit (PFC) in the power modules, troubleshooting becomes somewhat more complicated and requires additional experience and knowledge of the device for their operation.
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.
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.
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.
In cases of attempts to repair the motherboard DUNTKD981FM03, DUNTKD628FM18, PSLDMA898WJFW, RTUNQA035WJZZ, DUNTKD604FM26, it is necessary to check the operation of the power supply circuits of the microcircuits and, if possible, update the software (software). When repairing an MB board, you need to check its components IXB680WJ, BU4228G, TC7SHU04FU, MP1583. Defective items should be replaced.
If the TV works normally from external devices, but does not tune into television channels, the tuner DUNTKD984FM01 may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals, as well as the power supply of varicaps (30-33V).
Owners and users of the SHARP LC-42RD2RU television must remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
Service manual / schematic diagram -------------------> Sharp LC-42RD2E, LC-42RD2RU
LC-42RD2E, LC-42RD2S, LC-42RD2RU.
The DPS-268AP power supply module is made using the Power Factor Correction (PFC) scheme to eliminate multiple AC harmonics introduced into the power supply by the device. The PFC assembly is a Step-Up Converter based on the L6562D PWM controller, which evenly distributes high-frequency impulses of the charging current of the electrolytic capacitor of the rectifier filter of the mains voltage over a period of 50 Hz. The current of its charge in this case will already be determined not by its reactance (usually 10-30 ohms for the network frequency), but by the elements of the converter. As a result, a change in the amplitude of the pulses (envelope) of the consumed current of the converter will repeat the shape and phase of the input sinusoidal voltage. The availability of the increased voltage (about + 380V) in the operating mode on the capacitor of the line filter indicates the serviceability of the PFC node.
Main features of the SHARP LC-42RD2RU device:
Installed matrix (LCD panel) R1T420XW01 ++ A.
To power the backlight, an inverter 4HV1838.371 is used, it is controlled by the PWM controller OZ964SN (20), 393 (8), 358 (8), 324 (14), 4427YM (8), 78M12. A transformer 4004Q73J D02 of 10 pieces is installed in the inverter converter. As power elements of the inverter, keys of the type P2804ND5G (5) 10pcs are used.
The necessary supply voltages for all nodes of the SHARP LC-42RD2RU television are generated by the DPS-268AP power supply module or its analogs using L6562D (PFC), DAP011 (Standby), DLA001DTR (PWM Push-pull) microcircuits.
MainBoard - the main board (motherboard) is a DUNTKD981FM03 module, using IXB680WJ, BU4228G, TC7SHU04FU, MP1583 and others microcircuits.
The tuner DUNTKD984FM01, PAE2-806 M116P provides the reception of television programs and tuning to channels.
LCD TV SHARP LC-42RD2RU with LCD R1T420XW01 ++ A, diagonal size 42 "(106 cm) in 16: 9 format. The brightness of the screen is 500 cd / m² by CCFL (EEFL) fluorescent lamps. Contrast, as a ratio maximum brightness to minimum, at least 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 speaker system of sound 30 W (2x15W) 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 x2, audio x4, S-Video, 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 214 watts.
Overall dimensions: with stand 1027x724x306 mm, without stand 1027x667x142 mm.
TV Weight: with stand: 33.5 kg, without stand: 30.5 kg.
Attention! The R1T420XW01 ++ A panel of the SHARP LC-42RD2RU 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!
