Technical description and composition of the TELEFUNKEN TF-LED28S19 TV, panel type and modules used. The composition of the modules.TELEFUNKEN LED
Model: TF-LED28S19
Chassis / Version: MS306DPS
Panel: LVW280CSOT
T-CON: MT3151A05-5-XC-5 ST2751A01-8
LED driver (backlight): integrated into MainBoard; OUT = 33V
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MainBoard: 40-MS306D-MAD2LG MS306DPS
IC MainBoard: SPI FLASH: W25Q32FVSIG
Tuner: XF-3SDT-H
TF-LED28S19 Specifications
TELEFUNKEN TF-LED28S19
General recommendations for TV LCD LED repair
Possible manifestations of defects
- TELEFUNKEN TF-LED28S19 does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to control buttons and the remote control.
A malfunction in such cases should be looked for in the elements of the power source - the mains voltage converter (AC / DC), which is located on the MainBoard 40-MS306D-MAD2LG. It is necessary to measure the secondary output supply voltages, and if they are absent, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in semiconductor PN junctions.
In case of diode breakdowns in the secondary circuits, the converter can operate in an emergency mode of short circuit without output voltages, and with a short circuit in the power elements of the primary circuit, the mains fuse and / or the current sensor in the source of the key usually breaks off.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, supply, frequency setting, damper ... as well as elements of Negative Feedback of stabilization. The PWM microcircuit (PWM) PWM SOT23-6 can also cause a malfunction of the converter power switch and is checked by replacement.
- There is no picture, there is sound, it reacts to the remote control, the channels are switched. In some cases, the image appears when turned on and disappears immediately.
Most likely in these cases is a malfunction of the LED backlight. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
When trying to detect a break in the LED lines, it should be borne in mind that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
- The TV does not go into operation, does not respond to the remote control. The indicator on the front panel is on or blinking.
Repair or diagnostics of the 40-MS306D-MAD2LG motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and matrix. If necessary, you should update or replace the software (software). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - 25Q32 with new or known good ones. In cases where BGA technologies are used, defects are usually localized by heating.
If you suspect a malfunction of the XF-3SDT-H tuner, first of all, you need to make sure that the software is correct, as well as the presence of the necessary levels of supply voltages and pulses of data exchange with the processor via the I2C bus on the corresponding terminals of the tuner.
Remember! Attempts to self-repair the TELEFUNKEN TF-LED28S19 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!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> TELEFUNKEN TF-LED28S19, Main: 40-MS306D-MAD2LG MS306DPS, Panel: LVW280CSOT
The appearance of the MainBoard 40-MS306D-MAD2LG is shown in the figure below:40-MS306D-MAD2LG
40-MS306D-MAD2LG can be used in TVs:
TELEFUNKEN TF-LED28S19 (Panel LVW280CSOT), TELEFUNKEN TF-LED32S19 (Panel LVW320CS0T).
Main features of the TELEFUNKEN TF-LED28S19 device:
Installed matrix (LED panel) LVW280CSOT.
Matrix control uses the Timing Controller (T-CON) MT3151A05-5-XC-5.
A converter combined with the 40-MS306D-MAD2LG main board is used to power the backlight LEDs.
The power module is combined with the MainBoard and is made according to the AC / DC flyback voltage converter using PWM SOT23-6 microcircuits.
MainBoard - the main board (motherboard) is a 40-MS306D-MAD2LG module, using SPI FLASH chips: W25Q32FVSIG and others.
Tuner XF-3SDT-H provides reception of television programs and tuning to channels.
TV TELEFUNKEN TF-LED28S19 with LCD LVW280CSOT, diagonal size 27.5 "(70 cm) 16: 9 format. Display brightness of 220 cd / m² is provided by LED backlighting. Contrast, as the ratio of maximum brightness to minimum, is 3000: 1 The technology of production of the screen of this TV model is realized with LED backlighting.It is possible to view images in high quality HD at a resolution of 1366x768 pixels in the standard graphic resolution 720p (HD Ready) .Input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal shaping takes place in the 480i, 480p, 576i, 576p, 720p, 1080i standards Supported multimedia file formats: MP3, WMA, MPEG4, Xvid, DivX, MKV, JPEG.
Speaker power of 10 W (2x5 W) is provided by two speakers. The NICAM STEREO audio processing system is used.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, VGA, HDMI x2, USB. A headphone output is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector on the TV case is used, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768.
Overall dimensions: 645x390x84 mm.
TV weight: 3.5 kg.
Attention! Panel LVW280CSOT of LED TV TELEFUNKEN TF-LED28S19 is an expensive and unreliable element.
Do not allow any impacts on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV unrepairable.