Technical description and composition of the DNS M32DM8 TV, panel type and modules used. The composition of the modules.DNS LED
Model: M32DM8
Chassis / Version: T.MSD309
Panel: V320BJ2-P01
T-CON: V320BJ2-XC01; CM1685A
LED driver (backlight): integrated into PSU
PWM LED driver: OB3362RP
Power Supply (PSU): KW-PLE320301A
PWM Power: GR8876A
MOSFET Power: MDF7N65B
MainBoard: T.MSD309.BA3T
IC MainBoard: CPU: MSD309BT, SPI Flash: 25Q32, DRAM: W631GG6KB-12, HDMI: IT6633E-PKB, Audio: TPA3124D2, DVB-T2: MSB1231-LF;
M32DM8 Specifications
DNS M32DM8
General recommendations for TV LCD LED repair
A faulty power supply is often trivial - the TV does not turn on, does not make any sounds, does not shine or blink with any indicators. When diagnosing and repairing the power supply, after replacing the swollen capacitors of the secondary rectifier filters (if any), you must first check the mains fuse. If it breaks, you should check the power elements of the MDF7N65B transistors and the rectifier bridge diodes for avalanche (thermal) breakdown.
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 GR8876A PWM regulator microcircuit are subject to verification, which it is advisable to check by replacement.
If the DNS M32DM8 does not have an image, but there is sound and the TV is controlled from the remote control, a malfunction in the V320BJ2-P01 panel backlight circuits is likely. The LEDs or their power converter - LED driver may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to make sure that the electrolytic capacitors of the rectifier filter supplying the backlight unit are in good working order.
Often, in the absence of backlight, disassembly of the panel is required. It is necessary to check the serviceability of the LED transitions, as well as the reliability of the contact connections in the lines and connectors.
Without a special current source, it is impossible to check the line of series-connected LEDs, and it is unsafe for them to use any voltage sources over 12V for this purpose. Then all that remains is to open the panel and check each LED separately. Usually, Chinese multimeters with 9V power supply lightly light up one 3-volt LED, if you connect the probes to it in the forward direction, the red probe to the anode, the black one to the cathode. For dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of LED health. In the event of a malfunction of the LED, its zener diode will either be cut off, or broken through in the K / Z.
Repair or diagnostics of the T.MSD309.BA3T motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, you should update the software (software).
If it is not possible to replace the MB (SSB) board, you need to check the health of its elements - CPU: MSD309BT, SPI Flash: 25Q32, DRAM: W631GG6KB-12, HDMI: IT6633E-PKB, Audio: TPA3124D2, DVB-T2: MSB1231-LF; ... Defective components must be replaced.
Owners and users of the DNS M32DM8 TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> DNS M32DM8, Main: TP.SIS231.PT85, Panel: ST3151A05-5
To reduce the backlight current in LED drivers with OB3362RP (TSOP16) controller, increase the total resistance of the resistors from pin 5 (ISET) to the case. The maximum current in each of the four channels (in milliamperes) for the resistor Rset (in kilohms) will be determined from the ratio 3000 * 1.2V / Rset.
Additional MainBoard RepairThe appearance of the MainBoard T.MSD309.BA3T is shown in the figure below:
T.MSD309.BA3T
T.MSD309.BA3T can be used in TVs:
DNS M39DM8 (Panel V390HJ1-P02 Rev C1), DNS S29DB1 (Panel V290BJ1-LE1), DNS S39DB1 (Panel V390HJ1-LE1), DNS V40D8200 (Panel LSC400HV02-W05), DNS M32DM8 (Panel V320BJ2-P01), DNS S32DSB1 (Panel T315HB01 V.1), DNS S32DST1 (Panel HV320WX2-201).
External view of the power supply
Main features of the DNS M32DM8 device:
Installed matrix (LED panel) V320BJ2-P01.
Matrix control uses Timing Controller (T-CON) V320BJ2-XC01 ;.
A converter combined with a power supply is used to power the backlight LEDs and is controlled by the OB3362RP PWM controller.
The formation of the necessary supply voltages for all nodes of the DNS M32DM8 TV is carried out by the KW-PLE320301A power module, or its analogs using GR8876A microcircuits and MDF7N65B power switches.
MainBoard - the main board (motherboard) is a T.MSD309.BA3T module, using CPU chips: MSD309BT, SPI Flash: 25Q32, DRAM: W631GG6KB-12, HDMI: IT6633E-PKB, Audio: TPA3124D2, DVB-T2: MSB1231 -LF; and others.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V320BJ2-P01
Type: a-Si TFT-LCD, CELL
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: MVA, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Glass Depth: 0.70 + 0.70 mm
Transmissivity: 5.8% (with Polarizer)
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
DNS M32DM8 TV with LCD V320BJ2-P01, 32 "(81 cm) 16: 9 diagonal. The required brightness of the screen of 350 cd / m² is provided by LED backlighting. Contrast - the ratio of maximum brightness to minimum brightness is 5000: 1. The model's display technology uses LED backlighting.
The V320BJ2-P01 sensor and the MainBoard T.MSD309.BA3T software provide high quality HD viewing at a resolution of 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 24 W (2x12 W) is provided by two speakers. The NICAM STEREO audio processing system is used.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, SCART, VGA, HDMI x4, 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 television channels in the DVB-T, DVB-C, DVB-T2 standards.
The power consumed by the TV operating in mains mode is 60 W. Power supply KW-PLE320301A.
Dimensions: With stand 745x504x185 mm, Without stand 745x449x80 mm.
TV weight: 6.1 kg.
Attention! The panel V320BJ2-P01 of the DNS M32DM8 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.