Technical description and composition of the TELEFUNKEN TF-LED24S38T2 TV, panel type and modules used. The composition of the modules.TELEFUNKEN LED
Model: TF-LED24S38T2
Chassis / Version: MS34631-ZC01-01
Panel: V236BJ1-P01
LED backlight: U = 44V, I = 200 mA
LED driver (backlight): integrated into MainBoard
PWM LED driver: B3350CP
MOSFET LED driver: B15N10D
Power Supply (PSU): integrated into MainBoard
PWM Power: OB2273 PWM SOT23-6
MOSFET Power: 70R900P
MainBoard: MS34631-ZC01-01
IC MainBoard: SPI FLASH 25Q64
Tuner: NoName DVB-T2
TF-LED24S38T2 Specifications
TELEFUNKEN TF-LED24S38T2
General recommendations for TV LCD LED repair
Possible manifestations of defects
- TELEFUNKEN TF-LED24S38T2 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.
A malfunction in such cases should first of all 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 MS34631-ZC01-01 main board. Its output voltages should be measured and, if they are absent, check the serviceability of the power switches (70R900P) and rectifier diodes in the converters for a possible breakdown.
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 power switches (MosFet) in switching sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency setting or damper, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM controllers (PWM) OB2273 PWM SOT23-6, if they have no visible damage to the case and an open short circuit between the pins, are usually checked by replacing.
- 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.
Most likely in these cases is a malfunction of the LED backlight. The reason can sometimes be in the power supply of the LEDs, but more often in their malfunction (breakdown or breakage), sometimes in the violation of the contact connections of the LED strips.
To test the LED strips, to open all the transitions of the LEDs, you need several tens of volts or more, it is best to use a current source for such purposes. The breakage of several PN junctions connected in series cannot be detected with a multimeter or tester. In such cases, it is necessary to open the panel and check each LED. If your multimeter cannot open the LED junctions in forward bias, you can sometimes detect the presence of a protective zener diode PN junction by connecting the probes in the opposite direction. If the zener diode is cut off or broken in K / Z, then the LED is faulty and requires replacement.
- 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 MS34631-ZC01-01 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 - SPI FLASH 25Q64 with new or known good ones. In cases where BGA technologies are used, defects are usually localized by heating.
The malfunction of the NoName DVB-T2 tuner is established after checking the software and all supply voltages at its outputs. The I2C bus data exchange between the tuner and the processor can be monitored with an oscilloscope.
Owners of the TF-LED24S38T2 TV are recommended to contact only qualified specialists with the necessary work experience for repair! Attempts to repair yourself without the appropriate knowledge and skills can lead to irreversible negative consequences!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> TELEFUNKEN TF-LED24S38T2, Main: MS34631-ZC01-01, Panel: V236BJ1-P01
The appearance of the MainBoard MS34631-ZC01-01 is shown in the figure below:MS34631-ZC01-01
Main features of the TELEFUNKEN TF-LED24S38T2 device:
Installed matrix (LED panel) V236BJ1-P01.
To power the backlight LEDs, a converter combined with the MS34631-ZC01-01 main board is used, controlled by the B3350CP PWM controller. The keys of the B15N10D 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 using OB2273 PWM SOT23-6 microcircuits and 70R900P power switches.
MainBoard - the main board (motherboard) is a MS34631-ZC01-01 module, using SPI FLASH 25Q64 chips and others.
Tuner NoName DVB-T2 provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V236BJ1-P01
Type: a-Si TFT-LCD, CELL
Diagonal size: 23.6 inch
Resolution: 1366x768, WXGA
Display Mode: MVA, Normally Black, Transmissive
Active Area: 521.471x293.184 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Glass Depth: 0.50 + 0.50 mm
Transmissivity: 5.5% (with Polarizer)
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
TV TELEFUNKEN TF-LED24S38T2 with LCD V236BJ1-P01, 23.6 "(60 cm) diagonal in 16: 9 format. Display brightness of 200 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 3000: 1 is achieved by special LED control. 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 media 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.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, SCART, VGA, HDMI x2, 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.
Overall dimensions: 550x376x172 mm.
TV weight: 3.1 kg.
Attention! Panel V236BJ1-P01 LED TV TELEFUNKEN TF-LED24S38T2 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.