Technical description and composition of the HARPER 40F0550T TV, panel type and modules used. The composition of the modules.HARPER LED
Model: 40F0550T
Chassis / Version: HK-T.SP9202P53
Panel: V390HJ5-XCPE1
T-CON: V390HJ5-XCPE1
LED driver (backlight): integrated into MainBoard
PWM LED driver: OB3350CP
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MOSFET Power: TO-220
MainBoard: HK-T.SP9202P53
IC MainBoard: SPI Flash 25Q32
Tuner: Noname
Appearance
HARPER 40F0550T
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- HARPER 40F0550T 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.
In such cases, the main power source, the AC / DC converter of the mains voltage, which is combined with the MainBoard HK-T.SP9202P53, may be faulty. It is then necessary to measure its output voltages and, if they are absent, the power switches and rectifier diodes of the converters should be checked for the probability of a short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in an emergency mode of short circuit without output voltages, and with a short circuit in the elements of the primary circuit, the mains fuse most often breaks off immediately and, less often, the current sensor in the source of the key.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can disable it in the key mode, or provoke an excess of the maximum current or voltage values. These can be circuits supplying the PWM controller, damper or frequency setting circuits, or OOS (negative feedback) elements in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and a short circuit between the terminals, are checked by replacing them with a known good one.
- There is no image, there is sound, it reacts to the remote control. Or the image may appear for a second when turned on and disappear immediately.
The malfunction in most of these cases is found in the nodes and elements of the LED panel backlighting. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
To check the LED strips for breakage without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter; a voltage of the order of several tens of volts is required.
- 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 HK-T.SP9202P53 motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, you should update or replace the software (software). Complex repair of MB (SSB) board is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the SPI Flash 25Q32 elements. Malfunctions in BGA chips are usually easy to detect by warm-up.
If there is no tuning for terrestrial or cable TV channels, you should make sure that the software is correct, as well as in accordance with the nominal supply voltages at the Noname tuner outputs. It is also necessary to check with an oscilloscope the presence of pulses of data exchange between the tuner and the processor via the I2C bus.
We remind users again! Attempts to repair the HARPER 40F0550T TV on your own without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> HARPER 40F0550T, Main: HK-T.SP9202P53, Panel: V390HJ5-XCPE1
The appearance of the MainBoard HK-T.SP9202P53 is shown in the figure below:HK-T.SP9202P53
The main features of the HARPER 40F0550T device:
Installed matrix (LED panel) V390HJ5-XCPE1.
Matrix control uses Timing Controller (T-CON) V390HJ5-XCPE1.
To power the backlight LEDs, a converter is used, combined with the main board HK-T.SP9202P53, controlled by the OB3350CP PWM controller.
The power module is combined with the MainBoard and is made according to the AC / DC flyback voltage converter using SOT23-6 PWM microcircuits and TO-220 type power switches.
MainBoard - the main board (motherboard) is a HK-T.SP9202P53 module, using SPI Flash 25Q32 chips and others.
Tuner Noname provides reception of television programs and tuning to channels.