Technical description and composition of the SHARP LC-32AX5M TV, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-32AX5M LC-32BX6H
Panel: 32 inch
Inverter (backlight): RDENC2299TPZA
Power Supply (PSU): RDENCA182WJQZ
MainBoard: DUNTKD893WE04, DUNTKD892WE04
Control: GA518WJSB
Appearance
SHARP LC-32AX5M
General recommendations for repairing TV LCD
Repair of the SHARP LC-32AX5M, LC-32BX6H TV is better to start with a thorough external inspection and troubleshooting. It is advisable to carefully examine the internal and external components. Many visible signs make it possible to determine the future direction of troubleshooting and localization of the defect. In most cases, the repairman can guess the causes of the defect and possible consequences from the characteristic signs of typical TV defects, for example, ring cracks formed in the soldering of the element leads, swollen rectifier filter capacitors, charred resistors and other circuit elements.
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, it does not make any sounds or any signs of operability when it is turned on, there is a certain chance that the RDENCA182WJQZ power supply module is defective and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of processor power, but this happens much less often. When diagnosing and repairing the RDENCA182WJQZ power supply, it is first necessary to check the fuse, and if it breaks, the power switch and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors of the N-FET type fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, either dried electrolytic capacitors or dangling resistors of the primary circuit of the PSU, involved in the stabilization process. In this case, all semiconductor elements of the strapping of the PWM controller chip are subject to verification, which it is desirable to verify by replacement.
If the power module uses an active KKM circuit (power factor control), troubleshooting is somewhat more complicated.
If there is no image when you turn on the SHARP LC-32AX5M, LC-32BX6H, or it appears for a second and disappears completely, but there is sound, most likely either the backlight lamps or their power converter (inverter) are faulty. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit.
Diagnostics of the RDENC2299TPZA inverter can be difficult due to the operation of the protection, 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.
In such cases, special care should be taken during diagnostics, and after completion of all repair work, it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
The motherboard DUNTKD893WE04, DUNTKD892WE04 must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up constantly. In such cases, if the power supply circuits of the microcircuits are working, a software update may be necessary.
Attention to users! Self-repair of a TV SHARP LC-32AX5M, LC-32BX6H without the appropriate qualifications and experience can lead to its complete non-repairability!
Service manual / schematic diagram --------------> Sharp LC-32AX5H, LC-32AX5M, LC-32AX5X
Main features of the SHARP LC-32AX5M device:
Installed matrix (LCD-panel) 32 inches.
The RDENC2299TPZA inverter is used to power the backlight.
The formation of the necessary supply voltages for all nodes of the SHARP LC-32AX5M TV is carried out by the RDENCA182WJQZ power supply module, or its analogs.
MainBoard - the main board (motherboard) is a DUNTKD893WE04 module.