Technical description and composition of the SHARP LC-26P50E TV, panel type and applicable modules. The composition of the modules.SHARP
Model: LC-26P50E
Panel: LK255P3FZA1
Inverter (backlight): PSC10124H (RUNTKA151WJZZ)
PWM Inverter: STR-H2013
Power Supply (PSU): RDENCA122WJZZ PSC10125F M PKG1
PWM Power: STR-A6159M (Standby), MC33262D (PFC), SPF9001
MainBoard: KD186 + XD187WJ (WE485200S, WE37517DS)
IC MainBoard: MM1630EQ, MSP3413G1E, IXB427WJ, 24C64, IXB405WJ, SIL9021
Tuner: QA021WJ, RTUNQA021WJZZ
Control: IR: KD189
Technical Specifications LC-26P50E
SHARP LC-26P50E
General recommendations for repairing TV LCD
Possible malfunctions
- The SHARP LC-26P50E TV does not turn on and does not show any signs of turning on, it does not respond to the control buttons or to the remote control.
In such cases, the RDENCA122WJZZ power supply is usually faulty. It is necessary to measure its output voltages and, if they are absent, to check for short-circuit probabilities in the converters, power switches and rectifier diodes.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback circuits (OOS) of stabilization. PWM controllers (PWM) STR-A6159M (Standby), MC33262D (PFC), SPF9001, if they do not have visible damage to the case and open fault between the terminals, are usually checked by replacement.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply to the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
Sometimes, for diagnostic purposes, inverter protection must be disabled. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the XD187WJ motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements MM1630EQ, MSP3413G1E, IXB427WJ, 24C64, IXB405WJ, SIL9021 requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
Before changing the tuner QA021WJ, RTUNQA021WJZZ, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
It should be remembered! Attempts to independently repair the SHARP LC-26P50E TV, 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-26P50E, LC-32P50E, LC-37P50E
Service Manual with Schematic Diagram 108 pages of 2005 for the LC-26P50E, LC-32P50E, LC-37P50E
The appearance of the MainBoard KD186 is shown in the figure below:KD186
The appearance of the power supply
Main features of the SHARP LC-26P50E device:
Installed matrix (LCD panel) LK255P3FZA1.
To power the backlight, an inverter PSC10124H is used, it is controlled by the PWM controller STR-H2013.
The necessary supply voltages for all nodes of the SHARP LC-26P50E TV are generated by the RDENCA122WJZZ power supply module or its analogs using the STR-A6159M (Standby), MC33262D (PFC), SPF9001 microcircuits.
MainBoard - the main board (motherboard) is a KD186 module, using microchips MM1630EQ, MSP3413G1E, IXB427WJ, 24C64, IXB405WJ, SIL9021 and others.
Tuner QA021WJ, RTUNQA021WJZZ provides the reception of television programs and tuning to channels.