Technical description and composition of the SAMSUNG LE40M71B TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE40M71B
Chassis / Version: GMS40HE
Panel: LTA400WH-LH1
T-CON: 400WHC8LV1.3; ALTERA EP1S30F780C8N
Inverter (backlight): integrated into PSU
PWM Inverter: FAN7382
MOSFET Inverter: 2SK3568
Power Supply (PSU): BN44-00140A IP-280135A
PWM Power: ICE1PCS02, ICE2BS01, DM0565R
MOSFET Power: 06N80C3, 20N60C3
MainBoard: BN94-00964B BN41-00733C
IC MainBoard: S29AL008D70TF102, 3F866BXZZQZ8B, 24C32, EM6A9160TS-5G, TEA6422
Tuner: BN40-00078A TSLW3001PD32S (H)
Control: Remote: BN59-00530A, IR: BN41-00716A
Technical specifications LE40M71B
SAMSUNG LE40M71B
General repair guidelines for TV LCD
Possible manifestations of defects
- SAMSUNG LE40M71B TV does not turn on, does not respond to the remote control and control panel buttons, indicators do not light up and do not blink.
Most likely in this case, the BN44-00140A power module is faulty. It is necessary to measure the secondary output voltage, and in case of their absence, check the serviceability of the power switches (06N80C3, 20N60C3) of the converters and rectifier diodes for a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the 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. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch may be PWM (ICE1PCS02, ICE2BS01, DM0565R). It is checked only by replacement with a known good one.
- There is no image, there is sound, there is a reaction to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
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.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during operations, and after their completion, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- 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 BN94-00964B 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements S29AL008D70TF102, 3F866BXZZQZ8B, 24C32, EM6A9160TS-5G, TEA6422. BGA chip malfunctions are usually easy to detect by warming up.
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the voltage of the tuner BN40-00078A TSLW3001PD32S (H) and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Once again, remind users! Attempts to self-repair a SAMSUNG LE40M71B TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
MAIN BN94-00964B: DOLBY STV8257DSX, STA323W, TEA6422, M30840SGP, Pi3HDMI, 412HTBE, BA7657F, MAX232, FST3125 , 06LTC42, VHC157, PCM1754, LCX245, 24C32.
T-CON 400WHC8LV1.3 : ALTERA EP1S30F780C8N, ALTERA EPC16UC88N, K4D263238I-UC50, THine THC63LVD104A, TPS65160A, PS54350, 24C64, i7514HS, H6402AP.
Service manual and schematic diagram -----------> SAMSUNG LE40M71B Chassis GMS40HE.
The appearance of the MainBoard BN94-00964B is shown in the figure below:BN94-00964B
The appearance of the power supply
Main features of the SAMSUNG LE40M71B device:
The matrix (LCD panel) LTA400WH-LH1 is installed.
The matrix control uses the Timing Controller (T-CON) 400WHC8LV1.3 ;.
To power the backlight, a converter is used, combined with a power supply, controlled by a FAN7382 PWM controller. As power elements of the inverter, keys of the 2SK3568 type are used.
The necessary supply voltages for all nodes of the SAMSUNG LE40M71B TV are generated by the BN44-00140A power supply module or its analogs using ICE1PCS02, ICE2BS01, DM0565R microchips and power switches of the 06N80C3, 20N60C3 type.
MainBoard - the main board (motherboard) is a BN94-00964B module, using microcircuits S29AL008D70TF102, 3F866BXZZZZZ8B, 24C32, EM6A9160TS-5G, TEA6422 and others.
The tuner BN40-00078A TSLW3001PD32S (H) provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA400WH-LH1
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1366x768, WXGA
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 885.168x497.664 mm
Surface: Antiglare (Haze 44%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 1.07B (10-bit), CIE1931 90%
Response Time: 6 (G to G)
Frequency: 120Hz (60Hz Input)
Lamp Type: 20 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (2 ch, 10-bit), 51 pins
Voltage: 5.0V