Technical description and composition of the TELEFUNKEN TF-LED24S29T2 TV, panel type and modules used. The composition of the modules.TELEFUNKEN LED
Model: TF-LED24S29T2
Chassis / Version: 40-MT31BP-MAA2LG
Panel: V236BJ1-LE2 Rev. C1
LED driver (backlight): integrated into MainBoard
PWM LED driver: MP3398A
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6 (RT7738F)
MainBoard: 40-MT31BP-MAA2LG MIPE07R41 REV1.7
IC MainBoard: CPU: MT5531NDNT 1429-BCAH; SPI Flash: 25Q64F; SOUND: RT9108NB
Tuner: ST34WN-2T-E
TF-LED24S29T2 Specifications
TELEFUNKEN TF-LED24S29T2
General recommendations for TV LCD LED repair
Possible malfunctions
- TELEFUNKEN TF-LED24S29T2 does not turn on, 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, first of all, should be looked for in the power elements of a switching power supply (SMPS) - a mains voltage converter (AC / DC), which in this TV model is combined with the MainBoard 40-MT31BP-MAA2LG main board. Then we recommend measuring its output voltages and, if they are absent, you should check the serviceability of the power switches and rectifier diodes of the converters for a possible short circuit.
In case of avalanche and thermal breakdowns of diodes in secondary circuits, the converter can operate in an emergency short-circuit mode, and in case of a short circuit in the power elements of the primary circuit, the mains fuse or a current sensor in the source of the key is usually cut 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 (RT7738F) can also cause the converter power switch to malfunction 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.
Often in such cases there is no backlighting of the LED panel. The reason may be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
It is impossible to check the LED bars for a break without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts is required, and ideally a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters tend to light a single 3V LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as an indicator of serviceability. In faulty LEDs, the zener diode will either be cut off, or pierced in 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 40-MT31BP-MAA2LG 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, you may need to replace the chips - CPU: MT5531NDNT 1429-BCAH; SPI Flash: 25Q64F; SOUND: MP3398A is new or known to be working properly. In cases where BGA technologies are used, defects are usually localized by heating.
If you suspect a malfunction of the ST34WN-2T-E 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.
Attention to users! Self-repair of the TELEFUNKEN TF-LED24S29T2 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> TELEFUNKEN TF-LED24S29T2, Main: 40-MT31BP-MAA2LG MIPE07R41 REV1.7, Panel: V236BJ1-LE2 Rev.C1
The appearance of the MainBoard 40-MT31BP-MAA2LG is shown in the figure below:40-MT31BP-MAA2LG
40-MT31BP-MAA2LG can be used in TVs:
ERISSON 32LET82 (Panel LVW320CSOT E145 V2), ERISSON 32LET42T2 (Panel LVW320CSOT E274 V2), ERISSON 32LET41T2 (Panel LVW320CS0T E274 V2), FUSION FLTV-32T21 (Panel LVW320CZOT), SUPRA STV-LC32T420WL (Panel LVW320CSOT E155 V2), SUPRA STV-LC32T850WL (Panel LVW320CSOT E45 V1), SUPRA STV-LC28T662WL (Panel T8-28T3520-LPM20), SUPRA STV-LC24T850WL (Panel 720p HD 1366x768), TELEFUNKEN TF-LED32S29T2 (Panel LVW320CS0T E198 V4), TELEFUNKEN TF-LED24S29T2 (Panel V236BJ1-LE2 Rev.C1), THOMSON T24E12DHU-01B T24E12DHU (Panel LVW240AUDX E2 V6).
Main features of the TELEFUNKEN TF-LED24S29T2 device:
Installed matrix (LED panel) V236BJ1-LE2 Rev. C1.
To power the backlight LEDs, a converter combined with the 40-MT31BP-MAA2LG main board is used, controlled by the MP3398A PWM controller.
The power module is combined with the MainBoard and is made according to the AC / DC flyback voltage converter using PWM SOT23-6 (RT7738F) microcircuits.
MainBoard - the main board (motherboard) is a 40-MT31BP-MAA2LG module, using CPU chips: MT5531NDNT 1429-BCAH; SPI Flash: 25Q64F; SOUND: RT9108NB and others.
The ST34WN-2T-E tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V236BJ1-LE2
Type: a-Si TFT-LCD, Panel
Diagonal size: 23.6 inch
Resolution: 1366x768, WXGA
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 521.471x293.184 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8.5 (G to G)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
TV TELEFUNKEN TF-LED24S29T2 with LCD V236BJ1-LE2, diagonal 24 "(61 cm) in 16: 9 format. Screen brightness of 250 cd / m² is provided by LED backlighting. Contrast, as the ratio of maximum brightness to minimum brightness, is 3000 : 1. The LED panel of this TV is equipped with Edge LED, which can display high quality HD images at a resolution of 1366x768 pixels in 720p (HD Ready). The input high frequency or video signal can be processed in analog PAL systems , SECAM, NTSC Graphic processing and digital signal shaping takes place in 480i, 480p, 576i, 576p, 720p, 1080i standards Supported multimedia file formats: MP3, WMA, MPEG4, Xvid, MKV, JPEG.
Speaker power of 6 W (2x3 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. To connect a computer or laptop to this TV model, use the VGA (D-Sub 15) connector on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768.
The digital tuner is capable of receiving TV channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Overall dimensions: 557x380x148 mm.
TV weight: 4 kg.
Attention! Panel V236BJ1-LE2 Rev. C1 of LED TV TELEFUNKEN TF-LED24S29T2 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.