Technical description and composition of the SAMSUNG LE26B450 TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE26B450 LE26B450C4W
Chassis / Version: N65B / Ver.AO02
Panel: T260XW02 V.S // LTF260AP03
Lamp backlight: 4 LAMP CCFL
T-CON: LTF260AP03
Inverter (backlight): integrated into PSU
PWM Inverter: BD9893
MOSFET Inverter: 4N50C
Trans Inverter: LT-HU26
Power Supply (PSU): BN44-00259A
PWM Power: FAN7530, ICE3BR0665J
MOSFET Power: 6N60
MainBoard: BN41-01165B
IC MainBoard: SEMS12, WT61P8, ATMLH950 2GB 1 (24C1024), 25L6405DMI-12G (MX25L6405)
Tuner: BN40-00137A (analog BN40-00154A)
Specifications LE26B450
SAMSUNG LE26B450
General repair guidelines for TV LCD
Possible malfunctions
- SAMSUNG LE26B450 TV 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.
Often in such cases, the BN44-00259A power module is faulty. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches and rectifier diodes in the converters 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. 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) FAN7530, ICE3BR0665J, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
These manifestations can be triggered by a power supply module, or by inverter defects, as well as a 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 powering the inverter, you should ring in its converter power keys for breakdown and the secondary windings of transformers for an open.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the BN41-01165B 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). Sometimes it is necessary to check or replace (if necessary) the elements of the MainBoard board - SEMS12, WT61P8, ATMLH950 2GB 1 (24C1024), 25L6405DMI-12G (MX25L6405). In cases where the BGA processor is used, its malfunction is usually detected by local heating.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the tuner BN40-00137A. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Once again, remind users! Attempts to self-repair a SAMSUNG LE26B450 TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!
The appearance of the MainBoard BN41-01165B is shown in the figure below:BN41-01165B
BN41-01165B can be used in TVs:
SAMSUNG LE37B530P7 LE37B530P7W (Panel AX094F040E), SAMSUNG LE32B530 LE32B530P7W (Panel LTF320HA09), SAMSUNG LE32B531 LE32B531P7W (Panel LTF320HA09),
SAMSUNG LE26B4504WW4 V. V. 4.
The appearance of the power supply
Main features of the SAMSUNG LE26B450 device:
Installed matrix (LCD panel) T260XW02 V.S or LTF260AP03.
The matrix control uses the Timing Controller (T-CON) LTF260AP03.
To power the backlight, a converter is used, combined with a power supply, controlled by the BD9893 PWM controller. A transformer LT-HU26 is installed in the inverter converter. As power elements of the inverter, keys of type 4N50C are used.
The necessary supply voltages for all nodes of the SAMSUNG LE26B450 TV are generated by the BN44-00259A power module or its analogs using FAN7530, ICE3BR0665J microchips and 6N60 type power switches.
MainBoard - the main board (motherboard) is a BN41-01165B module, using chips SEMS12, WT61P8, ATMLH950 2GB 1 (24C1024), 25L6405DMI-12G (MX25L6405) and others.
The tuner BN40-00137A (analog BN40-00154A) provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: T260XW02 VS
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: VA, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
