Technical description and composition of the SAMSUNG LE26R72B TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE26R72B LE26R72BX
Chassis / Version: GBD26KE
Panel: T260XW02 // LTA260W2-L13
Inverter (backlight): HIU641C HPC-1561D
PWM Inverter: BD9766FV
Power Supply (PSU): BN96-03058A
PWM Power: VIPer22A, 4863-2 / G0622, F9222L
MOSFET Power: FDD5614P, FQD30N06L
MainBoard: BN41-00680C
Tuner: BN40-00079A
Specifications LE26R72B
SAMSUNG LE26R72B
General repair guidelines for TV LCD
An external examination of the external and internal elements should be carried out in a timely manner before the start of dismantling operations. According to some external signs of a change in the state of some elements, it is sometimes possible to make assumptions about the nature of the defect, as well as determine the further direction of the troubleshooting. In most cases, the repairman can guess the causes of the defect and possible consequences by the characteristic signs of typical TV defects, for example, ring cracks formed in the soldering of element outputs, swollen rectifier filter capacitors, charred resistors and other circuit elements.
In the case when the LE26R72B does not turn on, does not respond to the remote control and buttons on the front panel, does not blink bulbs and does not show any signs of operability, the power supply module BN96-03058A is probably faulty in this case. In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should be started by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
It should be remembered that in the practice of repair, usually the power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
In cases where the SAMSUNG LE26R72B TV has lost an image, and the sound is there and all other functions are operational, there is a possibility of a malfunction of the inverter (converter for powering the backlight). When you turn on the TV, the image may appear briefly and immediately disappear. It should be borne in mind that with such manifestations, the lamps themselves also fail, the malfunction of which can be detected by replacement, by connecting to the connectors for diagnostics that are known to be serviceable and suitable in power. When disabling the inverter protection (to enable diagnostics), special care must be taken in view of the risk of failure of the power elements. After completing all repair work, it is imperative to restore the protection circuits for full and safe further operation of the TV by the user.
Diagnosis and repair of the BN41-00680C motherboard usually begins with a test of the performance of the stabilizers and power converters of the module chips. In some cases, a software update is required.
If you suspect a malfunction of the tuner BN40-00079A, first of all, you need to verify the correctness of the software, as well as the presence of the necessary voltage levels at the corresponding terminals of the tuner.
Once again, remind users! Attempts to self-repair a SAMSUNG LE26R72B TV without the appropriate qualifications and experience can lead to its complete non-repairability!
The appearance of the MainBoard BN41-00680C is shown in the figure below:BN41-00680C
The appearance of the power supplyMain features of the device SAMSUNG LE26R72B:
Installed matrix (LCD panel) T260XW02 or LTA260W2-L13.
To power the backlight, an HIU641C inverter is used, controlled by the BD9766FV PWM controller.
The necessary supply voltages for all nodes of the SAMSUNG LE26R72B TV are generated by the BN96-03058A power supply module or its analogs using VIPer22A, 4863-2 / G0622, F9222L microchips and power switches of the FDD5614P, FQD30N06L type.
MainBoard - the main board (motherboard) is a BN41-00680C module.
The tuner BN40-00079A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: T260XW02 V6
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: AMVA, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (8-bit)
Response Time: 15/5 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
