Technical description and composition of the TV SHARP LC-20D1RU, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-20D1RU
Chassis / Version: DS-1107A
Panel: LQ197V3GZ83
T-CON: OEC7162A-083 RENESAS R8J66606A72FP, KE45U2380, BD8139EFV
Inverter (backlight): CEF205B DS1107A
PWM Inverter: C5886A
Power Supply (PSU): CMF088B
PWM Power: STR-W6765
MOSFET Power: C5886A (chip) 3n
MainBoard: CEF196A PAL (OR DVB-T) A6147DH061965DIGITALH
IC MainBoard: MSP34103C12, BA7810, LC373A, LC245A, STV0360C, M29W160ET
Tuner: 1ER2087 6716A
Control: GA481WJSA
Technical Specifications LC-20D1RU
SHARP LC-20D1RU
General recommendations for repairing TV LCD
It is advisable to start any repair and diagnostics of the SHARP LC-20D1RU TV with a careful external examination of internal and external elements, including case parts, a display, buttons, and cables. Visible damage to elements can sometimes suggest further directions for finding a defect before starting the necessary measurements. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
In cases where the SHARP LC-20D1RU TV does not turn on, does not respond to the remote control and buttons, any indicators on the front panel do not light up and do not blink and there are no sounds and no signs of operability at all, the CMF088B power supply module is most likely faulty or, which happens much less often - there is no power to the processor on the motherboard. 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. Options are C5886A (chip) 3n.
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 STRW6765 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.
In cases where the Power Factor Corrector (PFC) is used in the power supply, troubleshooting can be a bit more complicated.
If the SHARP LC-20D1RU 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.
Diagnosis of the CEF205B DS1107A inverter can be difficult due to the protection being triggered, which is organized by the designers to prevent negative consequences or fires in emergency cases, for example, during short circuits or breaks in the lamp power supply circuit, as well as their possible depressurization. To make the necessary measurements at control points or to take the necessary waveforms, repairmen have to block the protection circuits in order to be able to diagnose.
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.
Repair of the CEF196A PAL (OR DVB-T) A6147DH061965DIGITALH motherboard should begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM. Board repair and chip replacement MSP34103C12, BA7810, LC373A, LC245A, STV0360C, M29W160ET are carried out with the necessary equipment, and the corresponding element base.
Before replacing the tuner 1ER2087 6716A, if there is no tuning to the channels, you must first check the supply voltage at its terminals, including the power supply of varicaps (30-33V).
Attention to the owners! Attempts to repair the TV SHARP LC-20D1RU by yourself are not recommended by the manufacturer and can lead to serious negative consequences!
Main features of the SHARP LC-20D1RU device:
Installed matrix (LCD panel) LQ197V3GZ83.
The matrix control uses the Timing Controller (T-CON) OEC7162A-083.
A CEF205B inverter is used to power the backlight, controlled by a C5886A PWM controller.
The necessary supply voltages for all nodes of the SHARP LC-20D1RU TV are generated by the CMF088B power supply module or its analogs using STR-W6765 microchips and 3N type power switches C5886A (chip).
MainBoard - the main board (motherboard) is a CEF196A module, using microchips MSP34103C12, BA7810, LC373A, LC245A, STV0360C, M29W160ET and others.
The 1ER2087 6716A tuner provides TV reception and channel tuning.
Information from an alternative source:
SHARP LC-20D1RU Chassis: DS-1107A
Motherboard:CEF196A PAL (OR DVB-T) \ A6147DH061965DIGITALH \ TO8-66B, OMEGA STi5516AUC, EM639165TS-7G, EM638165TS-7G, M29W160ET, STV0360C, LC244A, LC245A, LC373A, BA7810, Tuner: 1ER2087 6716A
T-con: OEC7162A-083, RENESAS R8J66606A72FP, KE45U2380, OEC7162A, BD8139EFV
Invertor: CEF205B DS-1107A, C5886A
PSU: CMF088B, STRW6765, 070XZ5M, MSP34103C12
LCD TV SHARP LC-20D1RU with LCD LQ197V3GZ83, diagonal size 20 "4: 3 format. The brightness of the screen 430 cd / m² is organized by backlighting with CCFL fluorescent lamps (EEFL). Contrast, as the ratio of maximum brightness to minimum, not less than 500: 1. The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation takes place in the standards 480i, 480p, 576i, 576p.
The power of the sound system 4 W (2x2W) 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), S-Video, component, SCART, RGB. An output for connecting headphones is provided.
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 89 watts.
Overall dimensions: with stand 483x476x224 mm, without stand 483x433x107 mm.
TV Weight: with stand: 10.4 kg, without stand: 7.4 kg.
Attention! The LQ197V3GZ83 panel of the SHARP LC-20D1RU 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!
