Technical description and composition of the SHARP LC-26GA4E TV, panel type and applicable modules. The composition of the modules.SHARP
Model: LC-26GA4E
Panel: LK255T3FZA1
T-CON: XC807WJ KC807
Inverter (backlight): RUNTKA075WJZZ QKITS0059SNE2 (41)
Power Supply (PSU): QPWBS0067SNEZ (45) RDENCA072WJZZ
MainBoard: XC585WJ KC585 DE4655 + XC586WJ
IC MainBoard: RHIXA091WJZZ, CXA2069Q, MM1519XQ, SDA5550M, MSP3450G, AK4586VQ, TDA2024
Tuner: XC586WJ KC586 VTUATMQZ6-423
Technical Specifications LC-26GA4E
SHARP LC-26GA4E
General recommendations for repairing TV LCD
Possible malfunctions
- SHARP LC-26GA4E TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
Failure in such cases should begin to be sought in the QPWBS0067SNEZ power supply circuits. It is necessary to measure its output voltages and, in case of their absence, check the serviceability of power switches and rectifier diodes in the converters for possible breakdown.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke the excess of maximum current or voltage values. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately 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.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required when working, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- 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 XC585WJ 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). Sometimes it is necessary to check or replace (if necessary) the elements of the MainBoard board - RHIXA091WJZZ, CXA2069Q, MM1519XQ, SDA5550M, MSP3450G, AK4586VQ, TDA2024. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
The malfunction of the tuner XC586WJ KC586 VTUATMQZ6-423 is established after checking the software and all the supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
schematic service manual ------------------> SHARP LC-26GA4E
Service Manual with Schematic Diagram 59 pages 2004 model LC-26GA4E.
The appearance of the MainBoard XC585WJ is shown in the figure below:XC585WJ
XC585WJ can be used in TVs:
SHARP LC-32GA3 LCD-32GA3 (Panel 32 дюйма RLCDTA028WJZZ), SHARP LC-26GA4E (Panel LK255T3FZA1).
The appearance of the power supply
Main features of the SHARP LC-26GA4E device:
Installed matrix (LCD panel) LK255T3FZA1.
The matrix control uses the Timing Controller (T-CON) XC807WJ.
RUNTKA075WJZZ inverter is used to power the backlight.
The necessary supply voltages for all nodes of the SHARP LC-26GA4E TV are generated by the QPWBS0067SNEZ power supply module, or its analogs.
MainBoard - the main board (motherboard) is an XC585WJ module using RHIXA091WJZZ, CXA2069Q, MM1519XQ, SDA5550M, MSP3450G, AK4586VQ, TDA2024 and others.
Tuner XC586WJ KC586 VTUATMQZ6-423 provides the reception of television programs and tuning to channels.