Technical description and composition of the TV SHARP LC-37RD1RU, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-37RD1RU
Chassis / Version: KD890
Panel: LK370T3LZ5BX
T-CON: CPWBX3508TPZQ TPS65160A, LMX6332T1A, BD921ABL6, 24C64, 443X (6), AG32AE2 (8x4),
Inverter (backlight): RUNTKA216WJZZ
Power Supply (PSU): DPS-267AP RDENCA200WJQZ
PWM Power: L6562, DAS01A, DLA001, DAP011A
MainBoard: KD890 KD890WE24
IC MainBoard: VCT6993 B3 000, FRC9429A B2, EPM240T100CSH, SiI9023CTU, PIC16F913
Tuner: NQA033WJ DUNTKD609FM16
Control: GA538WJSA
Technical Specifications LC-37RD1RU
SHARP LC-37RD1RU
General recommendations for repairing TV LCD
It is advisable to start any repair and diagnostics of the SHARP LC-37RD1RU TV with a careful external examination of internal and external elements, including case parts, a display, buttons, and cables. 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. 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.
If the power supply module malfunctions, external manifestations may be different, for example, the SHARP LC-37RD1RU does not turn on at all and there is no indication of the indicator lights on the front panel. 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.
It should be remembered that the N-FET keys used in flyback converters rarely fail for no reason that must be sought by checking other elements of the circuit. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in the resistors in the stabilization circuits. The PWM controller chip can also cause a breakdown of the power switch of the converter.
In cases using a power module with an active KKM, troubleshooting is sometimes somewhat more complicated.
If the SHARP LC-37RD1RU TV does not have an image, but there is sound, the malfunction should be sought in the power converter of the backlight (inverter). It is also necessary to check the serviceability of the electrolytic capacitors of the filter of the secondary rectifiers of the BP (power supply) for an overstated ESR.
Repair of the RUNTKA216WJZZ inverter can often be somewhat complicated by the use of special protection circuits, which are designed to disconnect it in emergency cases for fire safety when the lamps are depressurized, or short circuits or breaks in high-voltage circuits and connections. Sometimes it becomes necessary for diagnostic purposes to block the protection circuits in order to be able to make the necessary measurements at the control points of the circuit.
When diagnosing with the protection off, special precautions must be taken, because there is a risk of failure of the power elements of the inverter. After the diagnosis, it is imperative to restore the protection circuits for the inverter to operate normally.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
Service Manual with Schematic Diagram 186 pages 2007 on models LC-32RA1E, LC-32RA1RU, LC-32RD1E, LC-32RD1RU, LC-32SA1EA, LC-32SA1RUA, LC-32SD1EA, LC-32SD1RUA, LC-32ST1EA, LC- 32ST1RUA, LC-32SV1EA, LC-32SV1RUA (LC-37RD1RU).
Service manual / schematic diagram -------------------> Sharp LC-42RD1E, LC-42RD1RU
PSU / schematic diagram -------------------> DPS-267AP RDENCA200WJQZ
The appearance of the MainBoard KD890 is shown in the figure below:Kd890
The appearance of the power supply
Main features of the SHARP LC-37RD1RU device:
Installed matrix (LCD panel) LK370T3LZ5BX.
The matrix control uses the Timing Controller (T-CON) CPWBX3508TPZQ.
RUNTKA216WJZZ inverter is used to power the backlight.
The necessary supply voltages for all nodes of the SHARP LC-37RD1RU television are generated by the DPS-267AP power supply module or its analogs using L6562, DAS01A, DLA001, DAP011A microcircuits.
MainBoard - the main board (motherboard) is a KD890 module, using VCT6993 B3 000, FRC9429A B2, EPM240T100CSH, SiI9023CTU, PIC16F913 and other chips.
Tuner NQA033WJ DUNTKD609FM16 provides the reception of television programs and tuning to channels.
LCD TV SHARP LC-37RD1RU with an LCD display, 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 , no less than 1200: 1. Dynamic contrast ratio of 3000: 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 acoustic system of sound 20 W (2x10 W) provide two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x3, 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.
A digital tuner is capable of receiving television channels in DVB-T standards.
Overall dimensions: with stand 920x657x291 mm, without stand 920x600x116 mm.
TV Weight: with stand: 25.5 kg, without stand: 22.9 kg.
Attention! The LCD TV panel SHARP LC-37RD1RU is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!