Technical description and composition of the SAMSUNG LE46A686M1F TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE46A686M1F
Chassis / Version: N46A
Panel: LTF460HC01
T-CON: BN81-01697A FRCM_TCON_V0.1
Inverter (backlight): SSB460W22V01 LEFT REV 0.1
Power Supply (PSU): BN44-00202A
PWM Power: UCC28060 (PFC), FSQ0765R
MainBoard: BN41-00974B BN94-02197E
IC MainBoard: MT8226, MT8291E, NTP-3100, WT61P8, HYB25DC256163CE-4, K4T56163QT
Tuner: BN40-00120A
Technical Specifications LE46A686M1F
SAMSUNG LE46A686M1F
General repair guidelines for TV LCD
Possible manifestations of defects
- SAMSUNG LE46A686M1F does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
Most likely in this case, the main switching power supply (IIP) BN44-00202A is faulty. It is necessary to measure its output voltages, and in case of their absence, check the operability of the power switches of the converters and rectifier diodes 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 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) UCC28060 (PFC), FSQ0765R, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good 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. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of transformers for an open.
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 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 BN41-00974B 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 chip replacement MT8226, MT8291E, NTP-3100, WT61P8, HYB25DC256163CE-4, K4T56163QT 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 the TV works normally from external devices, but does not tune into television channels, the tuner BN40-00120A 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, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair to professionals with sufficient experience in the repair of electronic equipment.
Service manual and schematic diagram -----------> SAMSUNG LE46A686M1F Chassis N46A.
The appearance of the MainBoard BN41-00974B is shown in the figure below:
BN41-00974B
BN41-00974B can be used in TVs:
SAMSUNG LE32A556P1 LE32A556P1F (Panel LTF320HA01 A04), SAMSUNG LE37A552 LE37A552P3R (Panel T370HW02 V.4), SAMSUNG LE37A656A1 LE37A656A1FXRU (Panel T370HW02 V6), SAMSUNG LE32A558P3F (Panel LTF320HA01), SAMSUNG LE40A656A1F (Panel LTF400HC01 A02), SAMSUNG LE37A615A3F LE37A615 (Panel T370HW02 V.4), SAMSUNG LE40A556P1F (Panel V400H1-L03 REV C1), SAMSUNG LE40A558P3F LE40A558 (Panel LTF400HA03), SAMSUNG LE32A656A1F (Panel LTF320HA04).
The appearance of the power supply
Main features of the SAMSUNG LE46A686M1F device:
Installed matrix (LCD panel) LTF460HC01.
The matrix control uses the Timing Controller (T-CON) BN81-01697A.
To power the backlight used inverter SSB460W22V01.
The formation of the necessary supply voltages for all nodes of the SAMSUNG LE46A686M1F TV is carried out by the BN44-00202A power module, or its analogs using UCC28060 (PFC), FSQ0765R microcircuits.
MainBoard - the main board (motherboard) is a BN41-00974B module, using chips MT8226, MT8291E, NTP-3100, WT61P8, HYB25DC256163CE-4, K4T56163QT and others.
The tuner BN40-00120A provides the reception of television programs and tuning to channels.