Technical description and composition of the SAMSUNG LE26R82B TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE26R82B LE26R82BS
Chassis / Version: GBP26SEN / GBP26SEU
Panel: T260XW02 V.5
Lamp backlight: 8 LAMP CCFL
Inverter (backlight): LOGAH VT71008.91
PWM Inverter: OZ964SN
Power Supply (PSU): BN44-00155A
PWM Power: TDA4863G, MC33067P, STR-A6159
MOSFET Power: STP20NM60, FQPF9N50C
MainBoard: BN41-00878A BN94-01583A
IC MainBoard: CPU: MT8293AE, Scaler: SDP64; SOUND: NTP-3000
Tuner: BN40-00099A
Specifications LE26R82B
SAMSUNG LE26R82B
General repair guidelines for TV LCD
Possible malfunctions
- SAMSUNG LE26R82B does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
Often in such cases, the BN44-00155A 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 breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short-circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the mains fuse and, less often, the current sensor at the source of the key are most often cut off.
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) MC33067P, 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 reacts to the remote control, channels are switched. In some cases, the image appears when you turn on and immediately 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.
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 TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the BN41-00878A motherboard should begin by checking the stabilizers and power converters needed to power the microcircuits and matrix. If necessary, you should update or replace the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - CPU: MT8293AE, Scaler: SDP64; SOUND: NTP-3000 and failed chips should be replaced with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board. Typically, such defects are detected by local heating of the chip.
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 BN40-00099A. 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 LE26R82B TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!
The appearance of the MainBoard BN41-00878A is shown in the figure below:BN41-00878A
BN41-00878A can be used in TVs:
SAMSUNG LE26R81BX LE26R81B LE26R81BS (Panel T260XW02 V.5), SAMSUNG LE26S81BS (Panel V260B1-L04 Rev. C1), SAMSUNG LE32S81B (Panel T315XW02), SAMSUNG LE32S81B (Panel V315B1-L01381, LT01301, LT01BC, Rev. SAMSUNG LE46S81B (Panel LTA460WT-L15 0T1), SAMSUNG LE46S81B (Panel LTA460WT-L15), SAMSUNG LE23R81W (Panel T230XW01 V.1), SAMSUNG LE26R82B (Panel T260XW02 V.5), SAMSUNG LE231XB01BW1B231BWBB81B23B81B23B81B23B81B23BX1B231
The appearance of the power supply
Main features of the SAMSUNG LE26R82B device:
Installed matrix (LCD panel) T260XW02 V.5.
The LOGAH inverter is used to power the backlight, controlled by the OZ964SN PWM controller.
The necessary supply voltages for all nodes of the SAMSUNG LE26R82B TV are generated by the BN44-00155A power module or its analogs using TDA4863G, MC33067P, STR-A6159 microchips and power switches of the STP20NM60, FQPF9N50C type.
MainBoard - the main board (motherboard) is a BN41-00878A module, using CPU chips: MT8293AE, Scaler: SDP64; SOUND: NTP-3000 and others.
The tuner BN40-00099A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: T260XW02 V5
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, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 15/5 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: 8 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V