Technical description and composition of the SAMSUNG UE55F8000AT TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE55F8000AT
Chassis / Version: UH02
Panel: CY-KF550DSLV5V
T-CON: LSF550HQ01
LED driver (backlight): integrated into PSU; 88V and 184V 340mA
Power Supply (PSU): BN44-00636B L55U2P_DHS
MainBoard: BN41-01959C
IC MainBoard: SN1202033 (TSSOP32), EEPROM: 24C512, SOUND: NTP-7412S, DRAM: K4B4G1646B
Tuner: BN40-00267A DNTT243IH145A
Technical Specifications UE55F8000
SAMSUNG UE55F8000AT
General repair guidelines for TV LCD LED
Possible malfunctions
- The SAMSUNG UE55F8000AT TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
With such manifestations, a malfunction is most likely to be detected in the BN44-00636B power module. It is necessary to measure its output voltages and, in case of their absence, check the serviceability of power switches and rectifier diodes in the converters for possible breakdown.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually 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, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
As a rule, in such cases there is no display backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters, as a rule, light up a single 3-volt LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as a health indicator. In faulty LEDs, the zener diode will either be cut off or broken into short-circuit.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the BN41-01959C 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). In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - SN1202033 (TSSOP32), EEPROM: 24C512, SOUND: NTP-7412S, DRAM: K4B4G1646B which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
In the absence of tuning to the channels of terrestrial or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the tuner BN40-00267A DNTT243IH145A. 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.
Once again, remind users! Attempts to self-repair a TV SAMSUNG UE55F8000AT without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
The appearance of the MainBoard BN41-01959C is shown in the figure below:BN41-01959C
BN41-01959C can be used in TVs:
SAMSUNG UE55F8000AT (Panel CY-KF550DSLV5V), SAMSUNG UE40F8000 UE40F8000AT (Panel CY-KF400DSLV1V).
The appearance of the power supply
Main features of the SAMSUNG UE55F8000AT device:
Installed matrix (LED-panel) CY-KF550DSLV5V.
The matrix control uses the Timing Controller (T-CON) LSF550HQ01.
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 UE55F8000AT TV is carried out by the power module BN44-00636B, or its analogues.
MainBoard - the main board (motherboard) is a BN41-01959C module, using chips SN1202033 (TSSOP32), EEPROM: 24C512, SOUND: NTP-7412S, DRAM: K4B4G1646B and others.
The tuner BN40-00267A DNTT243IH145A provides the reception of television programs and tuning to channels.
