Technical description and composition of the SAMSUNG LE40N87BDX TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE40N87BDX LE40N87BD
Chassis / Version: GTU40HEN
Panel: V400H1-L01
Inverter (backlight): I400H1-20A-A001D (1400H1-20A)
Power Supply (PSU): BN44-00167A
PWM Power: ICE1PCS02 (PFC), ICE3B0365J, FSDM0565
MOSFET Power: FQA13N50CF (PFC)
MainBoard: BN41-00813E BN94-01312R
IC MainBoard: MST3560M-LF-170, SiI9125CTU, SVP-WX68, HYB25D256163CE, 24C256WP, NTP-3000
Tuner: BN40-00096A DN0S403MH261B (S)
Control: Remote: BN59-00603A, IR BN41-00873A
Appearance
SAMSUNG LE40N87BDX
General repair guidelines for TV LCD
Possible malfunctions
- SAMSUNG LE40N87BDX does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
With such manifestations, a malfunction is most likely to be detected in the elements of a switching power supply - the BN44-00167A module. It is necessary to verify the presence of its output voltages and, if they are absent, to check the power switches (FQA13N50CF (PFC)) and rectifier diodes for a probable short circuit.
In the event of breakdowns in the secondary circuits, the converter may emergencyly operate in the short circuit mode, and during a short circuit in the power elements of the primary circuit, the mains fuse usually breaks. First of all, attention should be paid to the operation of the standby power converter, performed on the PWM controller ICE3B0365J.
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. PWM (PWM) ICE1PCS02 (PFC), ICE3B0365J, FSDM0565 are usually checked by replacing with obviously working ones.
- There is no image, there is sound, it responds to the remote. Or the image may appear for a second when turned on and immediately disappears.
These manifestations can be triggered by a power supply module, or by inverter defects, as well as distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the inverter power supply are serviceable, you should make sure that the lamps are in good working condition, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, inverter protection must be disabled. 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 turn on, the indicator signals standby or working mode, or blinks.
Repair or diagnostics of the BN41-00813E motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit 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 MST3560M-LF-170, SiI9125CTU, SVP-WX68, HYB25D256163CE, 24C256WP, NTP-3000. 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, check the voltage of the tuner BN40-00096A DN0S403MH261B (S) and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
It should be remembered! Attempts to self-repair a SAMSUNG LE40N87BDX TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
Service manual and schematic diagram ------------> SAMSUNG LE40N87BDX Chassis GTU40HEN.
PSU SCHEMATIC Samsung------------> BN44-00167A Power supply.
The appearance of the MainBoard BN41-00813E is shown in the figure below:BN41-00813E
BN41-00813E can be used in TVs:
SAMSUNG LE23R86 LE23R86BCX / FID (Panel T230XW01 v1), SAMSUNG LE37M87BD LE37M87BDX (Panel T370HW02 v.2), SAMSUNG LE52M87BD (Panel LTA520HA03), SAMSUNG LE40N87BDX LE40N87H1 (Panel).
The appearance of the power supply
Main features of the SAMSUNG LE40N87BDX device:
Installed matrix (LCD panel) V400H1-L01.
To power the backlight used inverter I400H1-20A-A001D.
The necessary supply voltages for all nodes of the SAMSUNG LE40N87BDX TV are generated by the BN44-00167A power module or its analogs using ICE1PCS02 (PFC), ICE3B0365J, FSDM0565 microcircuits and power switches of the FQA13N50CF (PFC) type.
MainBoard - the main board (motherboard) is a BN41-00813E module, using microcircuits MST3560M-LF-170, SiI9125CTU, SVP-WX68, HYB25D256163CE, 24C256WP, NTP-3000 and others.
The tuner BN40-00096A DN0S403MH261B (S) provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V400H1-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 885.6x498.15 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 530 cd / m²
Contrast Ratio: 1800: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: 20 pcs CCFL Embedded (Balance board)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V