Technical description and composition of the DNS M26DM5 TV, panel type and modules used. The composition of the modules.DNS LED
Model: M26DM5
Panel: V260B3-P08
T-CON: V260B3-XC08
LED driver (backlight): integrated into PSU
PWM LED driver: OB3370NCP
MOSFET LED driver: AOD417, P1604ED
Power Supply (PSU): LK-PL320205H
PWM Power: PWM SOP-8
MOSFET Power: ME15N10
MainBoard: T.MSD309.B81B 12115
IC MainBoard: H57Q1G630FR, 25Q32B, AIC2857F, TPA3124D2
Tuner: Tuner
Specifications M26DM5
DNS M26DM5
General recommendations for TV LCD LED repair
It is recommended to start troubleshooting and repairing the DNS M26DM5, like other electronic devices, with an external examination of the external and internal elements. From visible external changes in the state of components, it is often possible to determine the direction of troubleshooting before taking the necessary measurements. Experienced repairmen often guess about the causes of the defect and the possible consequences, for example, by ring cracks in the soldering of the element terminals, as well as by swollen capacitors or resistors burned out to coal dust and other external signs of certain malfunctions.
If the TV does not turn on, no control lamps are on or blinking, there are no sounds when turning on, not the slightest sign of operability - the most likely is a malfunction in the power module. When repairing a power supply, it is advisable to start diagnostics with checking the mains fuse and electrolytic capacitors of the filters of the secondary rectifiers of the converter. In the event of a break in the fuse, the cause should be sought in the power semiconductor elements of the pulse converter of the main power supply unit. First of all, it is necessary to check the diodes of the rectifier bridge of the mains voltage and the power switch (keys) of the ME15N10 converter. The complete inoperability of the power supply unit can be caused by a short circuit of the power elements in the primary circuit, followed by an open fuse, or a short circuit in the loads.
It should be borne in mind that in the practice of repair, it is extremely rare for key transistors in switching power supplies (SMPS) to fail without reasons that should be looked for by checking other components, for example, a key breakdown can provoke faulty elements of damper circuits, or dried electrolytic capacitors or broken primary resistors power supply circuits participating in the stabilization process. In this case, all semiconductor elements of the strapping of the PWM SOP-8 PWM regulator microcircuit are subject to verification, which it is advisable to check by replacement.
Sometimes the DNS M26DM5 TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of malfunction of the backlight converter, or the lamps themselves, which can be checked by replacing. In such cases, it is necessary to make sure that all electrolytic capacitors of the filter are in good working order for the power supply of the inverter itself, including the power supply unit (power supply unit). It must be borne in mind that in the event of a disconnection of the inverter protection (for the purpose of diagnostics) there is a risk of failure of the power elements of the inverter and take special care. After carrying out repair work, the protection circuits must be restored for the further safe operation of the TV.
The motherboard T.MSD309.B81B 12115 must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or is on continuously. In such cases, if the converters or power regulators of the microcircuits are working, it may be necessary to update the software. Repair of the board and replacement of microcircuits H57Q1G630FR, 25Q32B, AIC2857F, TPA3124D2 are performed if the necessary equipment and the corresponding element base are available. Malfunctions associated with the use of BGA soldering technologies can be localized by the warm-up method.
If there is no reception of TV channels, but the TV is working properly from external devices, first of all, you need to check the supply voltage of the Tuner tuner and update the software. I2C communication pulses must be monitored with an oscilloscope.
Attention! Users and owners of M26DM5 TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from trying to repair themselves in order to avoid negative consequences that can lead to the complete non-repairability of the device.
Additional MainBoard RepairThe appearance of the MainBoard T.MSD309.B81B is shown in the figure below:
T.MSD309.B81B
External view of the power supply
Key features of the DNS M26DM5:
Installed matrix (LED panel) V260B3-P08.
Matrix control uses Timing Controller (T-CON) V260B3-XC08.
To power the backlight LEDs, a converter combined with a power supply is used, controlled by the OB3370NCP PWM controller. The keys of the type AOD417, P1604ED are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes205H, or its counterparts using PWM SOP-8 microcircuits and power switches of the ME15N10 type.
MainBoard - the main board (motherboard) is a T.MSD309.B81B module, using H57Q1G630FR, 25Q32B, AIC2857F, TPA3124D2 and others.
Tuner Tuner provides reception of television programs and tuning to channels. of the DNS M26DM5 TV is carried out by the LK-PL320205H power module.
DNS M26DM5 TV with LCD V260B3-P08, 26 "(66 cm) 16: 9 format diagonal. The required screen brightness of 300 cd / m² is provided by LED backlighting. Contrast - the ratio of maximum to minimum brightness is 5000: 1. Dynamic contrast ratio of 100000: 1 is achieved by special control of the LEDs depending on the illumination of areas in the scene.This model uses a panel with an edge-mounted backlight LEDs - Edge LED.
The V260B3-P08 sensor and the MainBoard T.MSD309.B81B software provide HD quality viewing at 1366x768 pixels in 720p (HD Ready). The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal shaping takes place in the 480i, 480p, 576i, 576p, 720p standards. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG.
Speaker power 20 W (2x10 W) is provided by two speakers. The NICAM STEREO audio processing system is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, SCART, VGA, HDMI x3, USB. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector on the TV case is used, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768. The digital tuner is capable of receiving TV channels in DVB-T MPEG4 standards.
The power consumed by the TV operating in mains mode is 70 W. Power supply LK-PL320205H.
Overall dimensions: 644x466x175 mm.
TV weight: 5.65 kg.
Attention! The panel V260B3-P08 of the DNS M26DM5 LED TV is an expensive and unreliable element.
Do not allow any impact on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV unrepairable.