Technical description and composition of the SAMSUNG LE40F71B TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE40F71B (R) S
Chassis / Version: Ver: SP01
Panel: LTA400HS-LH1
T-CON: 400HSC4LV0.8
Power Supply (PSU): BN44-00140A
PWM Power: ICE1PCS02, ICE2BS01, DM0565R
MOSFET Power: 06N80C3, 20N60C3
MainBoard: BN41-00762B BN94-01088A
Tuner: BN40-00083A
Technical specifications LE40F71B
SAMSUNG LE40F71B
General repair guidelines for TV LCD
The appearance of the power supply
Main features of the SAMSUNG LE40F71B device:
Installed matrix (LCD-panel) LTA400HS-LH1.
The matrix control uses the Timing Controller (T-CON) 400HSC4LV0.8.
The necessary supply voltages for all nodes of the SAMSUNG LE40F71B TV are generated by the BN44-00140A power module or its analogs using ICE1PCS02, ICE2BS01, DM0565R microchips and power switches of the 06N80C3, 20N60C3 type.
MainBoard - the main board (motherboard) is a BN41-00762B module.
The tuner BN40-00083A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA400HS-LH1
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 885.6x498.15 mm
Brightness: 450 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (8-bit), CIE1931 92%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: CCFL
Signal Interface: LVDS (2 ch, 8-bit)
SAMSUNG LE40F71B signal absence is often caused by malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) LTA400HS-LH1, for example, a malfunction of CCFL (EEFL) lamps, and outside in their power source - an inverter.
Without backlighting, sometimes you can see a barely noticeable image with a certain successful hit of external light on the screen.
Often, repairing the backlight requires disassembling the LTA400HS-LH1 LCD panel - a painstaking process that requires special attention and accuracy from the technician. In such cases, there is a possibility, with the slightest negligence, to damage the glass or loops and the TV may become unrepairable.
We strongly do not recommend doing such work to owners of TVs and craftsmen who do not have experience in repairing LCD panels! Moreover, at home (at the owner's home).
If there is no image in the presence of backlight, the screen becomes slightly lighter when turned on, and if the TV is open, the light from the lamps can be seen through the holes in the panel case.
In this case, there may be a malfunction inside the panel, damage to strips, loops, the T-CON board (Timing Controller) may be defective. But the main board MainBoard BN41-00762B often turns out to be faulty, a software failure is also possible.
In such cases, the master first of all needs to check the main supply voltage of the panel at the LVDS connector, the fuses on the T-CON board or the panel brackets, as well as the supply and reference voltages for the line and column drivers - VGH, VGL, Vcom.
If all of the above measurements are within normal limits, then the oscilloscope must track the passage of LVDS signals from the MainBoard BN41-00762B, as well as synchronizing signals from T-CON to loops with drivers.
Owners and users of SAMSUNG LE40F71B TV should remember that self-repair without special knowledge, skills and qualifications may be fraught with negative consequences that can lead to complete non-repairability of the device!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Chassis GFM40SRU, GFM46SRU for models LE40F71B, LE46F71B
SAMSUNG LE40F71B TV with LCD LTA400HS-LH1, 40 "(102 cm) 16: 9 format diagonal. The required brightness of 450 cd / m² is provided by CCFL (EEFL) fluorescent lamps. Dynamic contrast ratio 6000: 1 is achieved by special control of operation backlight depending on the brightness of the scene.
The LTA400HS-LH1 sensor and MainBoard BN41-00762B software allow viewing of broadcasts and movies in high quality HD at a resolution of 1920x1080 pixels in graphics resolution at 1080p (Full HD). The input analog video signal is decoded in PAL, SECAM, NTSC systems. Graphic processing of a digital signal is carried out in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, JPEG.
Speaker power 20 W (2x10 W) is provided by two speakers. The NICAM stereo audio processing system and the Sound Surround function are used.
Communication with other devices via an external interface is supported by standard input and output connectors: antenna input (RF), AV, audio x4, S-Video, component, SCART x2, RGB, VGA, HDMI x2, USB. A headphone jack is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is provided. This interface supports standard resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1920x1080.
The power consumed when operating from the mains is 225 W. Power supply BN44-00140A.
Dimensions: with stand 994x696x290 mm, without stand 994x647x92 mm.
TV weight: 24.3 kg.
Attention! SAMSUNG LE40F71B LCD TV panel LTA400HS-LH1 is the most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!