TELEFUNKEN LEDModel: TF-LED32S4
Chassis / Version: MST6M182VG-T9C
Panel: K320WL1
LED driver (backlight): integrated in the PSU
PWM LED driver: OB3362HP
LED MOSFET driver: AOD478
Power supply (PSU): integrated into the MainBoard
PWM power: OB5269CP
MOSFET power: 10N65
Main board: MST6M182VG-T9C
MainBoard IC: CPU: MST6M182, SPI Flash: 25Q32
Tuner: TDA18273
TELEFUNKEN TF-LED32S4
General Repair Instructions for LCD LCD TVs
Possible manifestations of faults
- The TELEFUNKEN TF-LED32S4 television does not switch on and shows no sign of operability. There is no reaction to the buttons on the remote control and the front panel.
In such cases, the primary power source - the AC / DC voltage converter, which is combined with the MainBoard MST6M182VG-T9C, may be defective. Then we recommend that you measure its output voltages and, if they are not present, check the health of the current switches (10N65) and rectifier diodes of the converters to detect any possible short circuits.
In the event of a semiconductor failure in the secondary circuits, the converter can generally operate normally in emergency short-circuit mode. There is no output voltage. And in the event of a short circuit in the power elements of the primary circuit, as a rule, the main fuse will break and less often the current sensor at the source of the key.
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. PWM Controllers (PWM) OB5269CP, in the absence of external damage and a short circuit between the terminals, is checked by replacing it with obviously correct points.
- 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 these cases, a malfunction is generally most likely at the backlight nodes of the display array. 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.
Repairing or diagnosing the MST6M182VG-T9C motherboard should start by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, you must update or replace the software (software). Sometimes it is necessary to check or replace (if necessary) the elements of the MainBoard - CPU: MST6M182, SPI Flash: 25Q32. In cases where the BGA processor is used, its malfunction is generally detected by the local heating method.
If the TV operates normally from external devices, but does not tune in the TV channels, the TDA18273 tuner may not work properly. In this case, you must first make sure that there are supply voltages at the corresponding terminals. You should also ensure that the tuner and the processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner can be a software failure.
Owners and users of the TELEFUNKEN TF-LED32S4 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!
FIRMWARE SPI FLASH -----------> TELEFUNKEN TF-LED32S4, Main: MST6M182VG_T9C, Panel: K320WL1
The appearance of the MainBoard MST6M182VG-T9C is illustrated in the figure below:
MST6M182VG-T9C
Main features of the TELEFUNKEN TF-LED32S4 device:
Installed matrix (LED-panel) K320WL1.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the OB3362HP PWM controller. As the power elements of the LED driver, keys of the AOD478 type are used.
The power module is combined with the MainBoard and is made according to the scheme of a flyback AC / DC voltage converter using OB5269CP microcircuits and 10N65 type power switches.
MainBoard - the main board (motherboard) is an MST6M182VG-T9C module, using CPU chips: MST6M182, SPI Flash: 25Q32 and others.
The TDA18273 tuner provides television reception and channel tuning.