Technical description and composition of the TV SHARP LC-32DH77RU, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-32DH77RU LC-32DH77E
Panel: LK315D3LW1AY
Inverter (backlight): integrated into PSU
PWM Inverter: BD9883FV
MOSFET Inverter: 2SK3706, 2SJ655
Power Supply (PSU): RUNTKA456WJQZ PSD-0576
PWM Power: FA5500A, TNY274PN
MOSFET Power: 2SK4087, 2SK4096LS
MainBoard: DUNTKE685WE // QPWBXF190WJN1
IC MainBoard: STV8357F, IXC372WJ, S29G256P, MM1783CQ, STA333W
Tuner: TGA4-B03A
Control: H90420A
Technical Specifications LC-32DH77E
SHARP LC-32DH77RU
General recommendations for repairing TV LCD
Repair SHARP LC-32DH77RU must begin with the diagnosis of the malfunction and a thorough inspection of its external and internal components, including the case. Often, for certain external signs, the repairman can draw some conclusions about the reasons for the failure of certain elements of the circuit even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. In most cases, the repairman can guess the causes of the defect and possible consequences by the characteristic signs of typical TV defects, for example, ring cracks formed in the soldering of element leads, swollen rectifier filter capacitors, charred resistors and other circuit elements.
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 turned on, there is a certain chance that the RUNTKA456WJQZ power supply 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.
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.
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.
If the SHARP LC-32DH77RU does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction of the display backlight, or their power converter - inverter. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the inverter itself, including in the secondary rectifier of the main PSU.
Repair of the RUNTKA456WJQZ inverter is complicated by the fact that in case of any malfunction or emergency, even if the lamps are unevenly worn, a protection is triggered, which turns it off for fire safety purposes. Diagnostics become impossible and protection needs to be disabled.
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.
It should be remembered! Attempts to repair the TV SHARP LC-32DH77RU, 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-32DH77E, LC-32DH77RU, LC-32DH77S
psu / schematic diagram --------------> RUNTKA456WJQZ Power supply
The appearance of the MainBoard DUNTKE685WE is shown in the figure below:DUNTKE685WE
DUNTKE685WE can be used in TVs:
SHARP LC-32DH77RU LC-32DH77E (Panel LK315D3LW1AY), SHARP LC-52D65RU (Panel LK520D3LW1AY), SHARP LC-32D65E LC-32D65RU (Panel LK315D3LW1AY).
The appearance of the power supply
Main features of the SHARP LC-32DH77RU device:
Installed matrix (LCD panel) LK315D3LW1AY.
To power the backlight, a converter is used, combined with a power supply, controlled by the BD9883FV PWM controller. As power elements of the inverter, keys of the type 2SK3706, 2SJ655 are used.
The necessary supply voltages for all nodes of the SHARP LC-32DH77RU television are generated by the RUNTKA456WJQZ power supply module or its analogs using FA5500A, TNY274PN microchips and 2SK4087, 2SK4096LS power switches.
MainBoard - the main board (motherboard) is a DUNTKE685WE module, using microcircuits STV8357F, IXC372WJ, S29G256P, MM1783CQ, STA333W and others.
The TGA4-B03A tuner provides TV reception and channel tuning.
LCD TV SHARP LC-32DH77E with LCD LK315D3LW1AY, 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 30000: 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.
Supported media file formats: MP3, JPEG.
The power of the sound system 20 W (2x10 W) provides 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, component, SCART x2, RGB, VGA, HDMI x3, USB, 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.
The digital tuner is capable of receiving television channels in DVB-T MPEG4 standards.
The power consumed by the TV from the network in operating mode is 142 watts.
Overall dimensions: with stand 773x573x244 mm, without stand 773x528x103 mm.
TV Weight: with stand: 13.5 kg, without stand: 12 kg.
Attention! The LK315D3LW1AY panel of the SHARP LC-32DH77E 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!
