Technical description and composition of the SAMSUNG UE40D8000 TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE40D8000 UE40D8000YS
Chassis / Version: U55A
Panel: LTJ400HL05-L
T-CON: BN41-01663A S240LABMB3V0.7
LED driver (backlight): integrated into PSU
PWM LED driver: SEM5025
MOSFET LED driver: STU432S
Power Supply (PSU): BN44-00427A PD46B2_BSM
PWM Power: SQD3011K, UCC25600, ICE2PCS06 (PFC)
MOSFET Power: MDF9N50, 10NM60N
MainBoard: BN41-01622C
IC MainBoard: SDP1002, SDP94, SIL9489ACTUC, K4B2G1646C-HCH9, WT61P805
Tuner: BN40-00217B
Technical Specifications UE40D8000
SAMSUNG UE40D8000
General repair guidelines for TV LCD LED
Possible malfunctions
- SAMSUNG UE40D8000 does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
In some of these cases, the main switching power supply, the BN44-00427A module, is faulty. It is necessary to verify the presence of its output voltages and, if they are completely absent, check the power switches (MDF9N50, 10NM60N) and rectifier diodes for a probable short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the main fuse and, less often, the current sensor at the source of the key most often breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM microcircuits (PWM) SQD3011K, UCC25600, ICE2PCS06 (PFC) are usually checked by replacing with new ones, or obviously working.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights up constantly or blinks.
Repair or diagnostics of the BN41-01622C 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). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - SDP1002, SDP94, SIL9489ACTUC, K4B2G1646C-HCH9, WT61P805 and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board. Typically, such defects are detected by local heating of the chip.
If the TV works normally from external devices, but does not tune into television channels, the tuner BN40-00217B may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
TV users and owners need to remember that attempts to self-repair a SAMSUNG UE40D8000 TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
FIRMWARE Weltrend WT61P805 -----------> SAMSUNG UE40D8000 UE40D8000YS U55A, Main: BN41-01622C, Panel: LTJ400HL05-L
The appearance of the MainBoard BN41-01622C is shown in the figure below:BN41-01622C
BN41-01622C can be used in TVs:
SAMSUNG UE55D8000YS UE55D8000 (Panel LTJ550HQ11-L), SAMSUNG UE40D8000 UE40D8000YS (Panel LTJ400HL05-L).
The appearance of the power supply
Main features of the SAMSUNG UE40D8000 device:
Installed matrix (LED-panel) LTJ400HL05-L.
The matrix control uses the Timing Controller (T-CON) BN41-01663A.
To power the backlight LEDs, a converter is used, combined with the power supply, controlled by the SEM5025 PWM controller. As power elements of the LED driver, keys of the STU432S type are used.
The necessary supply voltages for all nodes of the SAMSUNG UE40D8000 TV are generated by the BN44-00427A power module or its analogs using SQD3011K, UCC25600, ICE2PCS06 (PFC) microcircuits and power switches of the MDF9N50, 10NM60N type.
MainBoard - the main board (motherboard) is a BN41-01622C module, using microchips SDP1002, SDP94, SIL9489ACTUC, K4B2G1646C-HCH9, WT61P805 and others.
The tuner BN40-00217B provides the reception of television programs and tuning to channels.