Technical description and composition of the TV SHARP LC-37RD2RU, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-37RD2RU
Panel: LK370T3LZ70Z
Inverter (backlight): RDENC2300TPZ
Power Supply (PSU): DUNTKE100FM01
PWM Power: BD3777, KIA324F (2pcs)
MainBoard: DUNTKD981FM02
Tuner: DUNTKD984WE01
Control: RRMC GA572WJSA
Technical Specifications LC-37RD2RU
SHARP LC-37RD2RU
General recommendations for repairing TV LCD
It is advisable to start diagnosing the malfunction of the SHARP LC-37RD2RU TV, like all others, with an external examination of possible changes, both external and internal elements. Many visible signs make it possible to determine the future direction of troubleshooting and localization of the defect. Ring cracks in the soldering of the leads of the heating elements, swollen electrolytic capacitors, a charred paint layer on the resistors - all this for the repairman can be a hint in the assumptions about the causes and consequences of the malfunction.
If the SHARP LC-37RD2RU does not turn on, no control lights on the front panel will light or blink, therefore, there is a very high probability of a power module malfunction. When diagnosing and repairing the power supply, first of all, it is necessary to check the fuse and, if it is broken, you must identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module - rectifier diodes or power switch.
Power switches in flyback converters fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The reason may be a malfunction of the PIA controller KIA324F 2pcs. BD3777, which can only be checked by replacing with a new or obviously working one.
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.
In cases where the SHARP LC-37RD2RU TV has lost its image, and the sound is there and all other functions are operational, there is a possibility of an inverter (converter for powering the backlight) malfunction. When you turn on the TV, the image may appear briefly and immediately disappear. It must be borne in mind that with such manifestations, the lamps themselves also fail, the malfunction of which can be detected by replacement, by connecting to the connectors for diagnostics that are known to be serviceable and suitable in power.
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.
It should be remembered that when the protection is turned off, there is always a risk of failure of the power elements of the inverter during diagnosis. After repair, it is necessary to restore all standard converter protection circuits.
Once again, remind users! Attempts to self-repair a TV SHARP LC-37RD2RU without the appropriate qualifications and experience can lead to its complete non-repairability!
Service manual / schematic diagram -------------------> Sharp LC-32RD2E, LC-32RD2S, LC-32RD2RU, LC-37RD2E, LC-37RD2S, LC-37RD2RU
Main features of the SHARP LC-37RD2RU device:Installed matrix (LCD panel) LK370T3LZ70Z.
The RDENC2300TPZ inverter is used to power the backlight.
The necessary supply voltages for all nodes of the SHARP LC-37RD2RU TV are generated by the DUNTKE100FM01 power module, or its analogs using BD3777, KIA324F microcircuits (2pcs).
MainBoard - the main board (motherboard) is a DUNTKD981FM02 module.
The tuner DUNTKD984WE01 provides reception of television programs and tuning to channels.
LCD TV SHARP LC-37RD2RU with LCD LK370T3LZ70Z, 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 1800: 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 sound speaker system 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 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 165 watts.
Overall dimensions: with stand 917x657x306 mm, without stand 917x600x125 mm.
TV Weight: with stand: 24.5 kg, without stand: 21.5 kg.
Attention! The LK370T3LZ70Z panel of an SHARP LC-37RD2RU 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!