Technical description and composition of the SAMSUNG T27D390 TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: T27D390
Panel: CY-MH270BGLV4H
T-CON: S270F01V01 HF Rev: 0.0; SM4142, LFM62A3
Inverter (backlight): integrated into MainBoard
PWM Inverter: SLC5014R
Power Supply (PSU): Adapter 14V 3.25A
MainBoard: BN41-02152B BN94-07379J
IC MainBoard: NTP7414, 25Q40, 24C256, K4B2G1646Q BCKO
Tuner: BN40-00281A DTOS40EIL276A
Control: BN59-01189A
Technical Specifications T27D390EX
SAMSUNG T27D390
General repair guidelines for TV LCD
Possible malfunctions
- The SAMSUNG T27D390 TV does not turn on, does not respond to the remote control and the control panel buttons, does not light up or blink indicators.
In such cases, the adapter power supply is usually faulty.
This TV model is equipped with an external power adapter adapter 14V 3.25A, which the owner can purchase independently, and repairing it may not always be advisable, however, sometimes there is some reason to open it and eliminate simple typical defects typical of IPS. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches and rectifier diodes in the converters for a 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 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 a short circuit between the terminals, are checked by replacing with obviously good ones.
- 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.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- 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 BN41-02152B motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, you should update or replace the software (software). In cases of attempts to repair the MB (SSB) board, it is necessary to check the serviceability of its elements - NTP7414, 25Q40, 24C256, K4B2G1646Q BCKO which may require replacement with new ones. If the 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).
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
Attention to users! Self-repair of a SAMSUNG T27D390 TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!
FIRMWARE FOR SPI FLASH------------> SAMSUNG T27D390 , Main: BN41-02152B BN94-07379J, Panel: CY-MH270BGLV4H
The appearance of the MainBoard BN41-02152B is shown in the figure below:BN41-02152B
BN41-02152B can be used in TVs:
SAMSUNG T27D390EX (Panel CY-MH270BGLVBV), SAMSUNG T27D390 (Panel CY-MH270BGLV4H).
Main features of the SAMSUNG T27D390 device:
Installed matrix (LCD panel) CY-MH270BGLV4H.
The matrix control uses the Timing Controller (T-CON) S270F01V01.
To power the backlight, a converter is used, combined with the main board BN41-02152B, controlled by the SLC5014R PWM controller.
To power all internal components of the SAMSUNG T27D390 TV, an external adapter type 14V 3.25A is used.
MainBoard - the main board (motherboard) is a BN41-02152B module, using NTP7414, 25Q40, 24C256, K4B2G1646Q BCKO chips and others.
The tuner BN40-00281A DTOS40EIL276A provides the reception of television programs and tuning to channels.