Technical description and composition of the SHARP LC-26GA5E TV, panel type and applicable modules. The composition of the modules.SHARP
Model: LC-26GA5E
Panel: LK255T3FZA1
T-CON: KC919 XC919WJ
Inverter (backlight): RUNTKA094WJZZ QKITS0077SNE4 (48) RUNTKA095WJZZ QKITS0076SNE5 (48)
Power Supply (PSU): PSD-0411 QPWBN0091SNEZ (49) RDENCA101WJZZ
PWM Power: TNY266P (7), MP1583DDP, MP1580HP (8), MC33262D (PFC)
MOSFET Power: FQPF9N50C SSS10N60A FQPF12N60C K3520
MainBoard: QPWXC656WJN4
Technical Specifications LC-26GA5E
SHARP LC-26GA5E
General recommendations for repairing TV LCD
Any repair of electronic equipment begins with an external inspection of the device and diagnostics of the malfunction. In this case, you should visually carefully examine all the elements of the SHARP LC-26GA5E TV, both internal and external. Many visible signs make it possible to determine the future direction of troubleshooting and localization of the defect. 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.
In the absence of any signs of operability, when the SHARP LC-26GA5E does not turn on and does not signal anything with the control lights on the panel, the PSD-0411 QPWBN0091SNEZ (49) RDENCA101WJZZ module is most likely to be faulty. It is advisable to start the troubleshooting of the power supply module by checking the mains fuse. If it is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and the power switch of the FQPF9N50C SSS10N60A FQPF12N60C K3520 converter, which are often found in breakdown conditions in such situations.
If a breakdown of the power switch of the flyback converter of the power supply unit is detected, it should be remembered that it does not fail without any reasons that should be sought by checking other elements of the primary circuit - electrolytic capacitors, PWM controller TNY266P (7) MP1583DDP (8) MP1580HP (8 ) MC33262D (8), which can only be checked by replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
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-26GA5E TV does not have an image, but there is sound, the malfunction should be sought in the backlight lamp power converter (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 inverter RUNTKA094WJZZ QKITS0077SNE4 (48) RUNTKA095WJZZ QKITS0076SNE5 (48) 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 open circuits in high voltage. 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.
It should be remembered that in such cases there is a risk of failure of the power elements of the inverter and to take special care. After carrying out repairs, the protection circuit must be restored for further safe operation of the TV.
The QPWXC656WJN4 motherboard must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up continuously. In such cases, if the power supply circuits of the microcircuits are working, a software update may be necessary.
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----------> Sharp LC-26GA5EE, LC-26GA5EF, LC-26GA5EI, LC-26GA5EK, LC-26GA5ERU, LC-32GA5E, LC-32GA5EF, LC-32GA5EI, LC-32GA5EK, LC-32GA5ERU
Service Manual with Schematic Diagram 136 pages 2005 models LC-26GA5E, LC-26GA5EE, LC-26GA5EF, LC-26GA5EI, LC-26GA5EK, LC-26GA5ERU, LC-32GA5E, LC-32GA5EE, LC-32GA5EF, LC- 32GA5EI, LC-32GA5EK, LC-32GA5ERU
The LC-26GA5E model uses the PSD-0411 power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, it is a boost converter based on the MC33262D PWM controller, which eliminates the charge current of the electrolytic capacitor of the rectifier filter directly from the network through open diodes when its charging current is determined by its reactance.As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
Main features of the SHARP LC-26GA5E device:
Installed matrix (LCD panel) LK255T3FZA1.
The matrix control uses the Timing Controller (T-CON) KC919.
The RUNTKA094WJZZ inverter is used to power the backlight.
The necessary supply voltages for all nodes of the SHARP LC-26GA5E television are generated by the PSD-0411 power module or its analogs using TNY266P (7), MP1583DDP, MP1580HP (8), MC33262D (PFC) microcircuits and power switches of the FQPF9N50C SSS10N60A KQ3535N60C type.
MainBoard - the main board (motherboard) is a QPWXC656WJN4 module.
LCD TV SHARP LC-26GA5E with LCD LK255T3FZA1, diagonal size 26 "(66 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, not less than 800: 1.
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 sound speaker system 20 W (2x10 W) 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), AV, audio x3, S-Video, component, SCART x2, RGB, VGA. 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, 1280x1024.
Overall dimensions: with stand 663x556x278 mm, without stand 663x504x108 mm.
TV mass: with stand: 15 kg, without stand: 12 kg.
Attention! The LK255T3FZA1 panel of an SHARP LC-26GA5E 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!