Technical description and composition of the SAMSUNG UE28H4000AK TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: UE28H4000AK
Chassis / Version: Ver. RS01
Panel: HH028AAGH-R1
LED backlight: LED 2014SVS28_3228_06 REV1.1_131108 (3 pcs)
T-CON: ST2751A01-3-XC-3
LED driver (backlight): integrated into PSU; 63V 350mA
Power Supply (PSU): BN44-00695A L28S0_ESM PSLF490S06A
PWM Power: S3330 (FAN6755)
MOSFET Power: MMF60R580P
MainBoard: BN41-02105A
IC MainBoard: K482G1646Q, F59L1G81A-25T, 25Q40, 24C256, NTP7414
Tuner: BN40-00281A DTOS40EIL276A
Control: BN59-00741A
Technical Specifications UE28H4000
SAMSUNG UE28H4000AK
General repair guidelines for TV LCD LED
Faults in the BN44-00695A L28S0_ESM power supply module can be expressed in different ways, for example, SAMSUNG UE28H4000AK does not turn on at all and the control lamps on its front panel do not light up and do not blink, and there are no signs of operability. In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should be started by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
It should be remembered that in the practice of repair, usually the power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuit.
If, when you turn on the TV, the image appears and immediately disappears, or is absent initially when you turn on, but there is sound and other functions work, there is a high probability of a malfunction of the display backlight LEDs; LED 2014SVS28_3228_06_REV1.1_131108 (3 pcs), or the LED driver for the power converter of the panel illumination unit, which is built into the common PSU module (BN41-02105A) and is a step-up voltage converter with current stabilization in the load.
In most cases where there is no backlight, it becomes necessary to disassemble the HH028AAGH-R1 panel in order to check the LEDs, connectors, loops and all contact connections. If one or several LEDs does not work in one line, therefore, they are broken and should be replaced.
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 test 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 LED will light up slightly.
The motherboard BN41-02105A must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up continuously. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary.
Malfunction of the tuner BN40-00281A DTOS40EIL276A is established after checking the software and all supply voltages at its terminals.
Attention to the owners! Attempts at self-repair of the SAMSUNG UE28H4000AK TV are not recommended by the manufacturer and can lead to serious negative consequences!
The appearance of the MainBoard BN41-02105A is shown in the figure below:
BN41-02105A
BN41-02105A can be used in TVs:
SAMSUNG T24D310EX (Panel V236BJ1-LE2 REV.C5), SAMSUNG UE28H4000AK (Panel HH028AAGH-R1), SAMSUNG T28D310EX (Panel HH028AGH-R2), SAMSUNG UE22H5000 UE22H5000AK (Panel MG28HT28) UE28J4100AK UE28J4100A (Panel HH028AGH-R2 ST2751A02-1).
The appearance of the power supply
Main features of the SAMSUNG UE28H4000AK device:
Installed matrix (LED panel) HH028AAGH-R1.
The matrix control uses the Timing Controller (T-CON) ST2751A01-3-XC-3.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the SAMSUNG UE28H4000AK TV are generated by the BN44-00695A power module or its analogs using S3330 microcircuits (FAN6755) and power switches of the MMF60R580P type.
MainBoard - the main board (motherboard) is a module BN41-02105A, using microchips K482G1646Q, F59L1G81A-25T, 25Q40, 24C256, NTP7414 and others.
Tuner BN40-00281A DTOS40EIL276A provides the reception of television programs and tuning to channels.