Technical description and composition of the SAMSUNG T28D310EX TV, panel type and applicable modules. The composition of the modules.SAMSUNG LED
Model: T28D310EX
Chassis / Version: Ver. WS03
Panel: HH028AGH-R2
LED backlight: 2014SVS28_3228_06_Rev1.1_131108
T-CON: ST2751A02-1-XC-2; G5562A = MAX17126A
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 BN94-08295T
IC MainBoard: K482G1646Q, F59L1G81A-25T, 25Q40, 24C256, NTP7414
Tuner: BN40-00281A DTOS40EIL276A
Control: IR A30857C (BN41-01976B)
Technical Specifications T28D310EX
SAMSUNG T28D310EX
General repair guidelines for TV LCD LED
If the T28D310EX TV does not turn on, does not make any sounds when it is turned on, and also no indicators on the front panel light or blink, there is a high probability of a malfunction in the power module. In some cases, there may be a malfunction only in standby power. It is advisable to start the troubleshooting of the power supply module by checking the state of the electrolytic capacitors of the rectifier filters and the mains fuse. Defective capacitors should be replaced. If the mains fuse is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and transistors, which are often found in such a state of breakdown.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors in switching power supplies (SMPS) fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, or dried electrolytic capacitors or dangling primary resistors BP circuits involved in the stabilization process. In this case, all semiconductor elements of the strapping of the PWM controller chip are subject to verification, which it is desirable to verify by replacement.
Sometimes the SAMSUNG T28D310EX TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a possibility of a malfunction of the LED driver - the power converter of the backlight LEDs of the HH028AGH-R2 panel, or a break in the LED circuit is possible. In such cases, first of all, it is necessary to verify the operability of the electrolytic capacitors of the filter by supplying the backlight unit.
To check the health of the LEDs, as well as contact connections in the ruler circuit, it is necessary to disassemble the panel.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect the probes in the forward direction to it (red probe to the anode, black to the cathode). In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as a health indicator. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
On the BN41-02105A BN94-08295T motherboard, in case of a malfunction, you should first check the performance of all the stabilizers and power converters of the microcircuits, and also, if necessary, update the software (software).
Before changing the tuner BN40-00281A DTOS40EIL276A, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
We recommend the owners of the T28D310EX TV for repair only to qualified specialists with experience! Self-repair attempts without the appropriate knowledge and skills 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 T28D310EX device:
Installed matrix (LED panel) HH028AGH-R2.
The matrix control uses the Timing Controller (T-CON) ST2751A02-1-XC-2 ;.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the SAMSUNG T28D310EX 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.
The tuner BN40-00281A DTOS40EIL276A provides the reception of television programs and tuning to channels.