TELEFUNKEN LEDModel: TF-LED28S12
Chassis / Version: TP.VST59.PB819
Panel: ST2751A01-8 D28-F2000
LED backlight: JS-LB-D-JP2820-061DBAD (50320)
T-CON: MT3151A05-5-XC-5; CS11102
LED driver (backlight): integrated in MainBoard
PWM LED driver: SN51DP
MOSFET LED driver: ME15N10-G
Power supply (PSU): integrated into the MainBoard
MainBoard: TP.VST59.PB819
MainBoard IC: CPU: TSUMV59XE-Z1, FLASH SPI: MX25L3205
Tuner: NoName
Control: IR: D0A35.IR.PCB R28-S00198-0020
TELEFUNKEN TF-LED28S12
General Repair Instructions for LCD LCD TVs
Possible malfunctions
- The TELEFUNKEN TF-LED28S12 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 this case, first of all, you must check the correct operation of the AC / DC network voltage converter, all of whose elements are located on the MainBoard TP.VST59.PB819 card. It is necessary to measure its output voltages and, in case of absence, to check the correct operation of the power switches of the converters and the rectifying diodes to determine the probability of a short circuit.
In the event of semiconductor failures in the secondary circuits of any converter, it can generally operate in emergency short-circuit mode without output voltages and during a short-circuit in the elements of the primary circuit, the fuse main and, less often, the current sensor at the source of the key.
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. PWM controllers (PWM), if they show no visible damage to the chassis and an open short circuit between the terminals, are generally checked by replacement.
- There is no picture, but there is sound, it reacts to the remote control. Or the image appears when you turn on and immediately disappears
In this case, the most likely malfunction of the LED panel backlight elements. This may be due to a break in the LED circuit or a problem with stabilizing their power supply.
To detect a break in the LED lines without dismantling the panel, a current source is necessary. It is impossible to open transitions connected in series with a simple multimeter, a voltage of several tens of volts is necessary
.
- The front panel indicator flashes, the television does not switch on in operating mode, it does not respond to the remote control.
The repair or diagnosis of the TP.VST59.PB819 motherboard must begin by checking the stabilizers and power converters necessary to supply the microcircuit and the matrix. If necessary, update or replace the software (software). When repairing an MB card, you must check the components of its processor: TSUMV59XE-Z1, SPI FLASH: MX25L3205. Defective items must be replaced. If chips using BGA welding technology are used, an implementation problem is detected by local heating of the chip.
If a NoName tuner is suspected of malfunctioning, it is first necessary to check the accuracy of the software, as well as the presence of the voltage levels and pulses necessary for the exchange of data with the processor via the bus. I2C to the corresponding terminals of the tuner.
FIRMWARE SPI FLASH ----------------> TELEFUNKEN TF-LED28S12, Main: TP.VST59.PB819, Panel: ST2751A01-8
MainBoard TP.VST59.PB819's appearance is illustrated in the figure below:TP.VST59.PB819
TP.VST59.PB819 can be used in televisions:
AKAI LEA-32P37P (Panel E32-OA35), AKIRA 32LED38P (Panel ST3151A05-8), TELEFUNKEN TF-LED28S12 (Panel ST2751A01-8).
Main features of the TELEFUNKEN TF-LED28S12 device:
Installed matrix (LED panel) ST2751A01-8 D28-F2000.
The matrix control uses the Timing Controller (T-CON) MT3151A05-5-XC-5 ;.
To power the backlight LEDs, a converter is used, combined with the main board TP.VST59.PB819, controlled by the SN51DP PWM controller. As the power elements of the LED driver, keys of the type ME15N10-G are used.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit.
MainBoard - the main board (motherboard) is a module TP.VST59.PB819, using CPU chips: TSUMV59XE-Z1, SPI FLASH: MX25L3205 and others.
The NoName tuner provides television reception and channel tuning.
Owners and users of the TELEFUNKEN TF-LED28S12 TV should remember that self-repair without special knowledge, skills and qualifications can have serious negative consequences which can lead to total non-repairability of the device!