Technical description and composition of the SAMSUNG UE48H8000 TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE48H8000 UE48H8000ST
Panel: CY-VH048DSLV1H
LED backlight: BN95-01375A
T-CON: BN41-02112A (BN95-01329A) LSF480HQ02 2014_GOLF_FTA_240HZ
LED driver (backlight): integrated into PSU; 128V 775mA
Power Supply (PSU): BN44-00727A L55CQ2_EDY
MainBoard: BN41-02189A BN94-07616U
IC MainBoard: CPU Stb: WT61P807, DRAM: K4B4G1646D-BCK0, Audio: TAS5747
Tuner: BN40-00278A
Control: IR: BN41-02187B (BN96-31812B) REV: 2.0 SJ140311 UH8000
Technical Specifications UE48H8000
SAMSUNG UE48H8000
General repair guidelines for TV LCD LED
Possible malfunctions
- The SAMSUNG UE48H8000 TV does not turn on and does not show any signs of turning on, it does not respond to the control buttons or the remote control.
With such manifestations, the BN44-00727A power module usually fails. Then it is necessary to measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of power switches and rectifier diodes of the converters for a possible short circuit.
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 power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers, in the absence of visible damage or frank short-circuit between the terminals, are checked by replacing with new, 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.
In most of these cases, a malfunction is detected in the nodes and backlight elements of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source. By opening the panel, each LED can be checked separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect probes in the forward direction to it. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the BN41-02189A 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 - CPU Stb: WT61P807, DRAM: K4B4G1646D-BCK0, Audio: TAS5747 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 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 BN40-00278A. 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.
Attention TV owners! Attempts to self-repair SAMSUNG UE48H8000 are not recommended by the manufacturer and can lead to serious negative consequences!
The appearance of the MainBoard BN41-02189A is shown in the figure below:BN41-02189A
The appearance of the power supply
Main features of the SAMSUNG UE48H8000 device:
Installed matrix (LED-panel) CY-VH048DSLV1H.
The matrix control uses the Timing Controller (T-CON) BN41-02112A.
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 UE48H8000 TV is carried out by the power module BN44-00727A, or its analogues.
MainBoard - the main board (motherboard) is a BN41-02189A module, using CPU chips Stb: WT61P807, DRAM: K4B4G1646D-BCK0, Audio: TAS5747 and others.
The tuner BN40-00278A provides the reception of television programs and tuning to channels.
