Technical description and composition of the SAMSUNG LE26D450 TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE26D450 LE26D450G1W
Chassis / Version: U56A / U56B
Panel: T260XW04 V.8
Lamp backlight: 4 Lamp CCFL
T-CON: T260XW04 V8 26T05-C04
Inverter (backlight): INV26T4UB
Power Supply (PSU): BN44-00438C I2632F1_BDY
PWM Power: SQT7011K, FAN7930B (PFC)
MOSFET Power: 13N60N
MainBoard: BN41-01603B BN94-04605T
IC MainBoard: Eeprom: 24C256, Submicom: WT61P805, Audio: NTP7411S
Tuner: BN40-00220A
Specifications LE26D450
SAMSUNG LE26D450
General repair guidelines for TV LCD
Possible malfunctions
- The SAMSUNG LE26D450 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.
Often in such cases, the BN44-00438C power module is faulty. It is necessary to measure its output supply voltages, and in case of their absence, check the operability of the power switches of the converters and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And during short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
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) SQT7011K, FAN7930B (PFC), 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 commands from the remote control. Or the image appears immediately after turning on and disappears.
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. 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 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 BN41-01603B 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 some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - Eeprom: 24C256, Submicom: WT61P805 with new or obviously good ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
In the absence of tuning to the channels of terrestrial 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 BN40-00220A. 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.
We recommend LE26D450 TV owners for repair only to qualified specialists with the necessary work experience! Attempts to repair it yourself without the appropriate knowledge and skills can lead to irreversible negative consequences!
The appearance of the MainBoard BN41-01603B is shown in the figure below:BN41-01603B
BN41-01603B can be used in TVs:
SAMSUNG LE32D451 LE32D451G3W (Panel T315XW03 V.D), SAMSUNG LE26D450 LE26D450G1W (Panel T260XW04 V.8).
The appearance of the power supply
Main features of the SAMSUNG LE26D450 device:
Installed matrix (LCD panel) T260XW04 V.8.
The matrix control uses the Timing Controller (T-CON) T260XW04.
To power the backlight used inverter INV26T4UB.
The necessary supply voltages for all nodes of the SAMSUNG LE26D450 TV are generated by the BN44-00438C power module or its analogs using SQT7011K, FAN7930B (PFC) microcircuits and 13N60N type power switches.
MainBoard - the main board (motherboard) is a BN41-01603B module, using Eeprom: 24C256, Submicom: WT61P805, Audio: NTP7411S and others.
The tuner BN40-00220A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: T260XW04 V8
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: MVA, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 2%), 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 Embedded (Balance board)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
