TELEFUNKEN LED
Model: TF-LED24S37T2
Chassis / Version: CV512L-U24
Panel: V236BJ1-P01 Rev.CB
LED backlight: Edge LED
LED driver (backlight): integrated in MainBoard
PWM LED driver: BIT3367A
MOSFET LED driver: MMBT3904
Power supply (PSU): integrated into the MainBoard
PWM power: LD5535
MOSFET power: 70R900P
MainBoard: CV512L-U24 - 11 (512C)
MainBoard IC: CPU: S2T512, Flash SPI: GD25Q64C, Audio: TDA3118E28
Tuner: CDT-9NT372-RD60 (RDA5160)
TELEFUNKEN TF-LED24S37T2
General Repair Instructions for LCD LCD TVs
Possible malfunctions:
- The TELEFUNKEN TF-LED24S37T2 television does not turn on, does not respond to the remote control and the buttons on the control panel, does not turn on and does not flash.
In such cases, the primary power source, the AC / DC voltage converter, which is combined with the MainBoard CV512L-U24, may be defective. It is then necessary to measure its output voltages and, if they are not present, you must check the probability of short-circuiting of the power switches (70R900P) and of the rectifier diodes of the converters.
In the event of faults in the secondary circuits of the converter, it can generally fail in short-circuit mode and, in the event of a short-circuit in the power elements of the primary circuit, the fuse or the current sensor at the source of the key most often breaks.
Mos-Fet keys used in switch mode power supplies generally fail due to a malfunction of other elements likely to put it out of service in key mode or to cause an excess of current or maximum voltage. These can be circuits supplying the PWM controller, damping or frequency adjustment circuits, or negative feedback elements in the stabilization circuit. The PWM controllers (PWM) LD5535, in the absence of external damage and a short circuit between the terminals, are checked by replacing them with good ones.
- There is no picture, there is sound, it responds to the remote control. Or, the image may appear for one second when it is turned on and immediately disappear.
In these cases, a malfunction is generally most likely at the backlight nodes of the display array. This can be due to both the power supply of the LEDs, their operating state (failure or breakage) and the violation of the contact connections of the LED strips.
To check the LED lines for breaks without dismantling the panel, for example, a power source will help you. It is impossible to open PN junctions connected in series with a simple multimeter, a voltage of the order of several tens of volts is required.
- The television does not switch on, does not respond to the remote control. The LED flashes or signals standby mode.
Repairing or diagnosing the CV512L-U24 motherboard should start with checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Sometimes they have to check or replace (if necessary) the elements of the MainBoard - CPU: S2T512, SPI Flash: GD25Q64C, Audio: TDA3118E28. In cases where the BGA processor is used, its malfunction is generally detected by local heating.
Before replacing the CDT-9NT372-RD60 (RDA5160) tuner, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to ensure that the tuner and the processor can exchange data via the I2C bus.
Attention users! Independent repair of a TELEFUNKEN TF-LED24S37T2 television without the appropriate qualifications and the necessary experience may result in its total non-repairability!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Main CV512L-U24
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> TELEFUNKEN TF-LED24S37T2, Main: CV512L-U24 - 11 (512C) , Panel: V236BJ1-P01 Rev.CB
The appearance of the MainBoard CV512L-U24 is shown in the figure below:
CV512L-U24
Main features of the TELEFUNKEN TF-LED24S37T2 device:
Installed matrix (LED-panel) V236BJ1-P01 Rev.CB.
To power the backlight LEDs, a converter combined with the CV512L-U24 main board is used, controlled by the BIT3367A PWM controller. MMBT3904 keys 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 LD5535 microcircuits and power switches of the 70R900P type.
MainBoard - the main board (motherboard) is a CV512L-U24 module, using CPU chips: S2T512, SPI Flash: GD25Q64C, Audio: TDA3118E28 and others.
Tuner CDT-9NT372-RD60 (RDA5160) 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-LED24S37T2 with LCD V236BJ1-P01, 23.6 "(60 cm) diagonal in 16: 9 format. Screen brightness of 200 cd / m² is provided by LED backlighting. Contrast, as the ratio of maximum brightness to minimum brightness, is 2400 : 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, MPEG4, Xvid, DivX , MKV, JPEG.
Speaker power of 6 W (2x3 W) is provided by two speakers. The NICAM STEREO audio processing system is used.
An external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, SCART, VGA, HDMI, 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 557x368x176 mm, without stand 557x332x86 mm.
TV weight: 2.2 kg.
Attention! Panel V236BJ1-P01 Rev.CB of LED TV TELEFUNKEN TF-LED24S37T2 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.