Technical description and composition of the SAMSUNG LE27T51BX TV, panel type and applicable modules. The composition of the modules.
SAMSUNG
Model: LE27T51BX LE27T51BWT
Chassis / Version: GTR27KE
Panel: V270B1-L01 Rev c1
T-CON: V270B1-L01
Inverter (backlight): 4H.V0708 E5
PWM Inverter: OZ960GN
MOSFET Inverter: FDS8958A
Power Supply (PSU): PSLF181501A BN96-02581A
PWM Power: VIPer12A (Standby), TDA4863G (PFC), F9222L, KIA278, MC33167T
MainBoard: BN41-00636C BN94-00752A
IC MainBoard: VCT49X3F, FLI5921H-LF, 24C32, MX25L4005, TPA3008
Tuner: BN40-00072A TECH0949PG46A (S)
Technical Specifications LE27T51B
SAMSUNG LE27T51BX
General repair guidelines for TV LCD
Possible manifestations of defects
- SAMSUNG LE27T51BX does not turn on and does not show any signs of performance at all. Does not blink indicators on the front panel and does not respond to control buttons.
In most of these cases, the PSLF181501A switching power supply is faulty. It is necessary to measure its output voltages and, if they are completely absent, you should check the power switches and rectifier diodes of the converters (PFC, main source and StandBy) for the probability of a short circuit.
In case of breakdowns of diodes in the secondary circuits, the converter can operate in emergency short circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
Mos-Fet keys used in pulsed sources 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. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power key may be PWM (PWM) VIPer12A (Standby), TDA4863G (PFC), F9222L. They are usually checked by replacing with new or obviously working ones.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
The defect can be caused by problems in the nodes or backlight elements of the display, or in the power of the lamps or inverter. After checking all the electrolytic capacitors of the filters that are involved in powering the inverter, you should ring in its converter power keys for breakdown and the 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 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 BN41-00636C 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). Board repair and replacement of VCT49X3F, FLI5921H-LF, 24C32, MX25L4005, TPA3008 microcircuits are carried out with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
If there is no reception of television channels, but the TV is working properly from external devices, first of all, check the voltage of the tuner BN40-00072A TECH0949PG46A (S) and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
We recommend LE27T51BX TV owners for repair only to qualified specialists with the necessary work experience! Attempts to repair it yourself without the appropriate knowledge and skills can lead to irreversible negative consequences!
The appearance of the MainBoard BN41-00636C is shown in the figure below:BN41-00636C
BN41-00636C can be used in TVs:
SAMSUNG LE27T51B (Panel V270B1-L01 rev c1), SAMSUNG LE27T51BC (Panel V270B1-L01), SAMSUNG LE27T51BX LE27T51BWT (Panel V270B1-L01 Rev c1).
The appearance of the power supply
Main features of the SAMSUNG LE27T51BX device:
Installed matrix (LCD panel) V270B1-L01 Rev c1.
The matrix control uses the Timing Controller (T-CON) V270B1-L01.
To power the backlight, an inverter 4H.V0708 is used, it is controlled by the PWM controller OZ960GN. As power elements of the inverter, keys of the FDS8958A type are used.
The necessary supply voltages for all nodes of the SAMSUNG LE27T51BX TV are generated by the PSLF181501A power module or its analogs using VIPer12A (Standby), TDA4863G (PFC), F9222L, KIA278, MC33167T microcircuits.
MainBoard - the main board (motherboard) is a BN41-00636C module, using VCT49X3F, FLI5921H-LF, 24C32, MX25L4005, TPA3008 and others.
Tuner BN40-00072A TECH0949PG46A (S) provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CMO
Model: V270B1-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 27.0 inch
Resolution: 1366x768, WXGA
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 596.259x335.232 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 550 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit), CIE1931 75%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 14 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
