Technical description and composition of the TELEFUNKEN TF-LED32S90T2 TV, panel type and modules used. The composition of the modules.TELEFUNKEN LED
Model: TF-LED32S90T2
Chassis / Version: CV512H-U42
Panel: CX315DLEDM
LED backlight: SJ.CX.D3200601-3030HS-M 1.14.MD320102
LED driver (backlight): integrated into MainBoard
PWM LED driver: 8 pin
MOSFET LED driver: TO-252
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MOSFET Power: TO-252
MainBoard: CV512H-U42
IC MainBoard: SPI Flash: W25Q64, Audio: RDA3118E28 (TPA3110D)
Tuner: CDT-9NT372-RD60
TF-LED32S90T2 Specifications
TELEFUNKEN TF-LED32S90T2
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- TELEFUNKEN TF-LED32S90T2 TV does not turn on. There are no signs of operability. The indicators on the front panel do not light up or blink, the TV does not respond to the control buttons.
In this case, the main power source, the AC / DC voltage converter, may be faulty, the elements of which in this model are located on the main board MainBoard CV512H-U42. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches (TO-252) and rectifier diodes for possible partial or complete breakdown.
In case of any breakdowns in the secondary circuits, the converter can operate in an emergency mode of a short circuit, and with a short circuit in the power elements of the primary circuit, the mains fuse or current sensor in the source of the key is often cut off.
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 the PWM controller, 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 image, there is sound, it reacts to the remote control. Or, immediately after switching on for a second, the image may appear and immediately disappear.
In such cases, the most likely malfunction of the LED panel backlighting elements. Often the reason is a malfunction of the LEDs (open circuit, short circuit ...), or the connectors of the strips (strings), less often the LED driver turns out to be faulty.
To check the health of the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can check each LED separately with a simple Chinese multimeter (powered by 9 volts) in the P-N transition test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black one to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. The serviceability of the PN junction of the Zener diode indirectly indicates the serviceability of the LED-a
- The TV does not turn on, the indicator signals standby or operating mode, or blinks.
Repair or diagnostics of the CV512H-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 some cases, to repair the MB (SSB) board, it may be necessary to replace chips - SPI Flash: W25Q64, Audio: RDA3118E28 (TPA3110D) with new or known good ones. In cases where BGA technologies are used, defects are usually localized by heating.
If the TV operates normally from external devices, but does not tune to TV channels, the CDT-9NT372-RD60 tuner may be faulty. In such cases, first of all, you should make sure that the supply voltage is present at its corresponding terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the reason for the inoperability of the tuner may be a software failure.
Remember! Attempts to self-repair the TELEFUNKEN TF-LED32S90T2 TV, in the absence of the necessary qualifications and experience, are strictly not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
The appearance of the MainBoard CV512H-U42 is shown in the figure below:CV512H-U42
CV512H-U42 can be used in TVs:
DEXP H39D7000Q (Panel LC390TA2A), SUPRA STV-LC32LT0010W (Panel KM0320LDRH0037).
Main features of the TELEFUNKEN TF-LED32S90T2 device:
Installed matrix (LED panel) CX315DLEDM.
To power the backlight LEDs, a converter combined with the CV512H-U42 main board is used, controlled by an 8 pin PWM controller. TO-252 switches 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 using PWM SOT23-6 microcircuits and TO-252 power switches.
MainBoard - the main board (motherboard) is a CV512H-U42 module using SPI Flash chips: W25Q64, Audio: RDA3118E28 (TPA3110D) and others.
The CDT-9NT372-RD60 tuner provides reception of television programs and tuning to channels.
TV TELEFUNKEN TF-LED32S90T2 with LCD CX315DLEDM, diagonal size 31.5 "(80 cm) 16: 9. The brightness of the screen is 270 cd / m² 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 of graphic decomposition 720p (HD Ready). Supported multimedia file formats: MP3, WMA, 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. A headphone output is provided.
The digital tuner is capable of receiving TV channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Dimensions: with stand 730x470x170 mm, without stand 730x430x76 mm.
TV weight: 3.6 kg.
Attention! Panel CX315DLEDM LED TV TELEFUNKEN TF-LED32S90T2 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.
