Technical description and composition of the SAMSUNG LE46N87BD TV, type of panel and applicable modules. The composition of the modules.SAMSUNG
Model: LE46N87BD
Chassis / Version: GTU46HEN
Panel: T460HW02 V.1
Lamp backlight: 24 Lamp CCFL
Inverter (backlight): integrated into PSU + SSB460WA22L
PWM Inverter: FAN7382, LX1691A
MOSFET Inverter: FQPF9N50C
Power Supply (PSU): BN44-00166A IP-46STD CCFL REV1.0
PWM Power: ICE1PCS02 (PFC), DM0365R (Standby DIP-8), ICE2BS01 (DIP-8 flyback)
MOSFET Power: SD20N60 (PFC), FQPF6N80C
MainBoard: BN41-00813D MP1.0 BN94-01312G
IC MainBoard: MST3560M-LF, SIL9125CTU, SGTV5810C, NTP3000
Tuner: BN40-00096A
Specifications LE46N87BD
SAMSUNG LE46N87BD
General repair guidelines for TV LCD
Possible malfunctions
- The SAMSUNG LE46N87BD TV does not turn on and does not show any signs of turning on, it does not respond to the control buttons or the remote control.
In some of these cases, the main switching power supply, the BN44-00166A module, is faulty. It is necessary to measure its output voltages, and in case of their absence, check the serviceability of power switches (SD20N60 (PFC), FQPF6N80C) of converters and rectifier diodes for a short circuit probability.
In the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often 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) ICE1PCS02 (PFC), DM0365R (Standby DIP-8), ICE2BS01 (DIP-8 flyback), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously working ones.
- There is no image, but there is sound and all the other functions of the TV work. The image sometimes for a second appears immediately after turning on and 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.
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 BN41-00813D 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 board (SSB), it is necessary to check the health of its elements - MST3560M-LF, SIL9125CTU, SGTV5810C, NTP3000 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).
If the TV works normally from external devices, but does not tune into television channels, the tuner BN40-00096A may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Once again, remind users! Attempts to self-repair a SAMSUNG LE46N87BD TV without the appropriate qualifications and necessary experience can lead to its complete failure to repair!
Service manual and schematic diagram SAMSUNG LE46N87BD Chassis GTU46HEN.
BN41-00813D
The appearance of the power supply
Main features of the SAMSUNG LE46N87BD device:
Installed matrix (LCD panel) T460HW02 V.1.
To power the backlight, a converter is used, combined with a power supply, controlled by a FAN7382, LX1691A PWM controller. As power elements of the inverter, keys of the FQPF9N50C type are used.
The necessary supply voltages for all nodes of the SAMSUNG LE46N87BD TV are generated by the BN44-00166A power module or its analogs using ICE1PCS02 (PFC), DM0365R (Standby DIP-8), ICE2BS01 (DIP-8 flyback) microcircuits and power switches of the SD20N60 (PFC) type ), FQPF6N80C.
MainBoard - the main board (motherboard) is a BN41-00813D module, using microcircuits MST3560M-LF, SIL9125CTU, SGTV5810C, NTP3000 and others.
The tuner BN40-00096A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: T460HW02 V1
Type: a-Si TFT-LCD, Panel
Diagonal size: 46 inch
Resolution: 1920x1080, FHD
Display Mode: AMVA, Normally Black, Transmissive
Active Area: 1018.08x572.67 mm
Surface: Antiglare (Haze 40%), Hard coating (3H)
Brightness: 550 cd / m²
Contrast Ratio: 2000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 15/5 (Tr / Td); 6.5 (G to G)
Frequency: 60Hz
Lamp Type: 24 pcs CCFL Embedded (Balance board)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V