Technical description and composition of the SAMSUNG UE65F8000 TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE65F8000
Chassis / Version: U90A
Panel: CY-KF650DSLV1H
LED backlight: Edge Led BN96-28866A, BN96-28867A, BN96-28868A
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00640A L65U2P_DDY
MainBoard: BN41-01959B BN94-06687E
IC MainBoard: SDP1201 (SDP1202), EEPROM: 24C512, eMMC: KLM4G1FE3B-B001, SPI Flash: 25X40CL
Tuner: BN40-00267A
Technical Specifications UE65F8000
SAMSUNG UE65F8000
General repair guidelines for TV LCD LED
Possible malfunctions
- SAMSUNG UE65F8000 TV does not turn on, does not respond to the remote control and control panel buttons, indicators do not light up and do not blink.
In such cases, the malfunction should be sought first in the BN44-00640A power supply module. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, it is necessary to check the serviceability of power switches and rectifier diodes for possible breakdown (short circuit).
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
To check the health in the LED circuit it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can check each LED individually with a simple Chinese multimeter (powered by 9 volts) in the P-N-junction test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. A zener diode PN junction indirectly indicates a LED-a
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the BN41-01959B 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements SDP1201 (SDP1202), EEPROM: 24C512, eMMC: KLM4G1FE3B-B001, SPI Flash: 25X40CL. BGA chip malfunctions are usually easy to detect by warming up.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltages at the terminals of the tuner BN40-00267A. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
TV users and owners must remember that attempts to self-repair a SAMSUNG UE65F8000 TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
The appearance of the MainBoard BN41-01959B is shown in the figure below:BN41-01959B
The appearance of the power supply
Main features of the SAMSUNG UE65F8000 device:
Installed matrix (LED-panel) CY-KF650DSLV1H.
To power the backlight LEDs, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the SAMSUNG UE65F8000 TV is carried out by the BN44-00640A power module, or its analogues.
MainBoard - the main board (motherboard) is a BN41-01959B module, using microchips SDP1201 (SDP1202), EEPROM: 24C512, eMMC: KLM4G1FE3B-B001, SPI Flash: 25X40CL and others.
The tuner BN40-00267A provides the reception of television programs and tuning to channels !
