Technical description and composition of the TELEFUNKEN TF-LED43S43T2S TV, panel type and modules used. The composition of the modules.TELEFUNKEN LED
Model: TF-LED43S43T2S
Chassis / Version: CV338H-U42
Panel: CX430DLEDM
LED backlight: MS-L1143 V3
LED driver (backlight): integrated into MainBoard
PWM LED driver: BIT3267
MOSFET LED driver: AOD4454
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MOSFET Power: N-FET 7N60 TO-252
MainBoard: CV338H-U42
IC MainBoard: CPU: MSD6A338, SPI Flash: 25Q16
Tuner: R842 Rafael Micro
TF-LED43S43T2S Specifications
TELEFUNKEN TF-LED43S43T2S
General recommendations for TV LCD LED repair
Possible manifestations of defects
- TELEFUNKEN TF-LED43S43T2S does not turn on and does not show any signs of operability at all. Does not blink indicators and does not respond to control buttons.
In such cases, the common power source is often faulty - the AC / DC converter of the mains voltage, which is combined with the elements of the CV338H-U42 main board. It is necessary to make sure that its output voltages are present and, if they are completely absent, check the power switches (N-FET 7N60 TO-252) and rectifier diodes for a possible short circuit.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work in an emergency mode in a short-circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM regulator, in frequency-setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) PWM SOT23-6 are usually checked by replacing them with new ones, or knowingly working.
- There is no picture, but there is sound and all other functions work. Sometimes, when turned on, the image appears and disappears for a second.
Usually, in such cases, there is no backlighting of the LED panel (matrix). Usually the cause of the malfunction is in the breakage of the LEDs, or in the connectors of the LED strips, but sometimes the LED driver is also faulty.
Without a special current source, it is impossible to check the line of series-connected LEDs, and it is unsafe for them to use any voltage sources over 12V for this purpose. Then all that remains is to open the panel and check each LED separately. Typically, Chinese multimeters with a 9V power supply lightly light up one 3-volt LED, if you connect the probes to it in the forward direction, the red probe to the anode, and the black one to the cathode. For dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of LED health. In the event of a malfunction of the LED, its zener diode will either be cut off or broken into the K / Z.
- The indicator on the front panel blinks, the TV does not turn on in operating mode, does not respond to the remote control.
Repair or diagnostics of the CV338H-U42 motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, you should update or replace the software (software). In cases of complex MB (SSB) repairs and with the necessary skills and equipment, it may sometimes be necessary to replace its CPU chips: MSD6A338, SPI Flash: 25Q16 and other possible faulty components. Failures associated with BGA soldering technologies are usually easily diagnosed by the warm-up method.
If there is no reception of TV channels, but the TV is working properly from external devices, first of all, you need to check the supply voltage of the R842 Rafael Micro tuner and update the software. I2C communication pulses must be monitored with an oscilloscope.
We remind users again! Attempts to repair the TELEFUNKEN TF-LED43S43T2S TV without proper qualifications and the necessary experience can lead to its complete non-repairability!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Chassis CV338H-T42
MainBoard CV338H-U42 is shown in the figure below:CV338H-U42
Main features of the TELEFUNKEN TF-LED43S43T2S device:
Installed matrix (LED panel) CX430DLEDM.
To power the backlight LEDs, a converter combined with the CV338H-U42 main board is used, controlled by the BIT3267 PWM controller. The keys of the AOD4454 type are used as power elements of the LED driver.
The power module is combined with the MainBoard and is made according to the AC / DC flyback voltage converter circuit using PWM SOT23-6 chips and N-FET 7N60 TO-252 power switches.
MainBoard - the main board (motherboard) is a CV338H-U42 module, using CPU chips: MSD6A338, SPI Flash: 25Q16 and others.
Tuner R842 Rafael Micro provides reception of television programs and tuning to channels.
TV TELEFUNKEN TF-LED43S43T2S with LCD, 43 "(109 cm) diagonal in 16: 9 format. Display brightness of 220 cd / m² is provided by LED backlighting. Contrast, as the ratio of maximum brightness to minimum, is 5000: 1. The technology of manufacturing the screen of this TV model is realized with LED backlighting.The design and technical capabilities of the TV provide viewing of broadcasts and films in high quality HD at a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD).
TF-LED43S43T2S TV is equipped with SMART software, built-in applications and the ability to work on the Internet. Internet connection can be made via Wi-Fi wireless connection. Supported media file formats: MP3, WMA, MPEG4, Xvid, DivX, MKV, JPEG.
Speaker power 16 W (2x8 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, component, VGA, HDMI x3, USB, Ethernet (RJ-45), Wi-Fi. A headphone output is provided.
The digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Attention! Panel LED TV TELEFUNKEN TF-LED43S43T2S 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 non-repairable.