TELEFUNKEN LED
Model: TF-LED32S47T2
Chassis / Version: CV512H-Q42
Panel: LSC320AN09
LED backlight: ZDCX32D10-ZC21F-0
LED driver (backlight): integrated in MainBoard
PWM LED driver: BIT3267
MOSFET LED driver: ME15N10-G
Power supply (PSU): integrated into the MainBoard
PWM power: AP3125
MOSFET power: SMK0760F
Motherboard: CV512H-Q42
MainBoard IC: CPU: S2T512, FLASH SPI: GD25Q64, Audio: RT9108NB
Tuner: CDT-9NT372-RD60
TELEFUNKEN TF-LED32S47T2
In such cases, the primary power source, the AC / DC voltage converter, which is combined with the MainBoard CV512H-Q42, may be defective. It is necessary to measure its output voltages and, in case of absence (total or partial), it is necessary to check the operating state of the power switches (SMK0760F) of the converters and rectification diodes in order to detect the presence of a possible short circuit.
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.
The failure of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example in circuits supplying the PWM controller, frequency regulators or registers, as well as in the circuits of stabilization with negative feedback. The PWM controllers (PWM) of the AP3125, if they do not show visible damage to the chassis and if they are in an open short circuit between the terminals, are generally checked by replacement.
- There is no picture, but there is sound and feedback from the remote control. Or for one second, the image may appear immediately after the power is turned on.
As a rule, in this case there is no backlight. The cause of the malfunction is often the lack of current in the LED circuit, for example an open circuit or a short circuit, or a violation of the connector contact connections.
It is impossible to check for breaks in the LED line without dismantling the panel with a multimeter or a tester. For this, it is necessary to open all PN junctions connected in series and a voltage of the order of a few tens of volts will be necessary, and ideally a current source. After dismantling the panel, it is necessary to check each LED separately. Chinese multimeters, as a rule, light a single 3-volt LED in the forward direction. When using two 6-volt LEDs, the PN junction of its Zener protection diode can serve as an integrity indicator. In faulty LEDs, the Zener diode will either be cut or short-circuited.
- The television does not switch on, the indicator signals a standby or operating mode or flashes.
Repairing or diagnosing the CV512H-Q42 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Often, the MB (SSB) card must be replaced in the event of complex malfunctions that are difficult to detect. When trying to repair, you need to check the items - CPU: S2T512, SPI FLASH: GD25Q64, Audio: RT9108NB and replace the faulty chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in the modern motherboard. Typically, such faults are detected by local heating of the chip.
If you suspect a malfunction of the CDT-9NT372-RD60 tuner, you must first check the accuracy of the software, as well as the presence of the voltage levels and pulses necessary for data exchange with the processor via the bus. I2C to the corresponding terminals of the tuner.
Again, we remind television users: you should not attempt to repair it yourself without the required knowledge, experience and qualifications! Entrust the repair to professionals sufficiently experienced in the repair of electronic equipment.
The figure below shows the appearance of the MainBoard CV512H-Q42:CV512H-Q42
Main characteristics of the TELEFUNKEN TF-LED32S47T2 device:
Installed matrix (LED panel) LSC320AN09.
To supply the backlight LEDs, a converter is used, associated with the main board CV512H-Q42, controlled by a BIT3267 PWM controller. Keys of type ME15N10-G are used as power supplies for the LED driver.
The power module is combined with the MainBoard and is designed according to a reverse feedback AC / DC voltage converter using AP3125 microcircuits and SMK0760F type power switches.
MainBoard - the motherboard (motherboard) is a CV512H-Q42 module using processor chips: S2T512, SPI FLASH: GD25Q64, Audio: RT9108NB and others.
The CDT-9NT372-RD60 tuner can receive TV programs and tune in channels.
Additional technical information on the panel:
Brand: SAMSUNG
Model: LSC320AN09
Type: a-Si TFT-LCD, CELL
Diagonal size: 31.5 inches
Resolution: 1366x768, WXGA
Display mode: SVA, normally black,
Active transmissive surface: 697.685x392.256 mm
Surface: Anti-reflective (Haze 2%), hard coating (2H)
Glass depth: 0.50 + 0.50 mm
Transmissibility: 6.9% (with polarizer)
Contrast ratio: 4000: 1
Display colors: 16.7M (8 bit), sRGB 68%
Response time: 20 (G to G)
Frequency: 60Hz
Signal interface: LVDS (1 channel, 8 bit),
Voltage 30 pins: 12.0V