Technical description and composition of the TV SHARP LC-29LE448RU, type of panel and applicable modules. The composition of the modules.SHARP LED
Model: LC-29LE448RU LC-29LE448
Chassis / Version: T.VST59.96
Panel: V290BJ1-PE1 LED OR7A
LED backlight: CEN950A, CEN951A (CP2000 LED-BAR_R, CP2000 LED-BAR_L 325mm 52LED)
T-CON: V290VJ1-XC01
Power Supply (PSU): CEP962A
MainBoard: T.VST59.96
IC MainBoard: 25Q32B
Tuner: NoName
Control: IR: CEP964A
Technical Specifications LC-29LE448
SHARP LC-29LE448RU
General repair guidelines for TV LCD LED
Possible manifestations of defects
- SHARP LC-29LE448RU does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
Most likely, in this case, the CEP962A main switching power supply (MPS) is faulty. It is necessary to measure its output voltages, and in case of their absence, check the operability of the power switches of the converters and rectifier diodes for the probability of a short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often 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 an excess of the maximum current or voltage. 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 and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the T.VST59.96 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace elements 25Q32B. BGA chip malfunctions are usually easy to detect by warming up.
Tuner malfunction Tuner is installed 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.
We recommend the owners of the LC-29LE448RU TV for repair only to qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
Service manual / schematic diagram -----------> SHARP LC-29LE448RU Chassis T.VST59.96
The appearance of MainBoard T.VST59.96 is shown in the figure below:T.VST59.96
The appearance of the power supply
Main features of the SHARP LC-29LE448RU device:
Installed matrix (LED-panel) V290BJ1-PE1 LED OR7A.
The matrix control uses the Timing Controller (T-CON) V290VJ1-XC01.
The necessary supply voltages for all nodes of the SHARP LC-29LE448RU TV are generated by the power module CEP962A, or its analogs.
MainBoard - the main board (motherboard) is a T.VST59.96 module, using 25Q32B chips and others.
The NoName tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V290BJ1-PE1
Type: a-Si TFT-LCD, CELL
Diagonal size: 29.0 inch
Resolution: 1366x768, WXGA
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 631.092x354.816 mm
Surface: Antiglare (Haze 1%)
Glass Depth: 0.50 + 0.50 mm
Transmissivity: 5.4% (with Polarizer)
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit)
Response Time: 9.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
SHARP LC-29LE448 LED TV with V290BJ1PE1 LCD display, diagonal size 29 inches (74 cm) 16: 9 format. The screen brightness of 250 cd / m² is provided by LED backlighting. This model uses backlight with the end position of the LEDs (relative to the screen) - Edge LED.
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.
Supported media file formats: MP3, WMA, MPEG4, DivX, JPEG.
The power of the speaker system of sound 18 W (2x9 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, component, VGA, HDMI x2, USB. An output for connecting headphones is provided.
Overall dimensions: With a support of 662x429x170 mm, Without a support of 662x403x68 mm.
The mass of the TV: 5.3 kg.
Attention! The V290BJ1PE1 LED OR7A panel of the SHARP LC-29LE448 LED TV is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.