Technical description and composition of the DNS M32AM8 TV, panel type and modules used. The composition of the modules.DNS LED
Model: M32AM8
Panel: V320BJ6-PE1 Rev. C1
LED backlight: IC-B-KKL32D032 JJ79K5
T-CON: V320BJ3-XC01
LED driver (backlight): integrated into PSU
PWM LED driver: OB3362RP
Power Supply (PSU): KW-PLE320301A DHX-2C
PWM Power: GR8876A
MOSFET Power: MDF7N65B
MainBoard: T.VST59S.81
IC MainBoard: CPU: TSUMV59XES, FLASH: GD25Q32, SOUND: TPA3110D2
Tuner: CDT-3NP5I1-10
Specifications M32AM8
DNS M32AM8
General recommendations for TV LCD LED repair
In the absence of any signs of operability, when the DNS M32AM8 does not turn on and does not signal anything with the control lamps on the panel, there is a possibility that the power supply module KW-PLE320301A DHX-2C of the TV may malfunction. Diagnostics and repair of the common power supply should always begin with checking the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the mains rectifier, as well as the large electrolytic capacitor of the mains rectifier filter.
In most cases, key breakdowns in switching power supplies (SMPS) do not occur without reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as broken resistors or punctured semiconductor elements in the stabilization circuits. Possible marriage of the PWM chip GR8876A from the manufacturer.
If, when the TV is turned on, the image appears and immediately disappears, or is absent initially when turned on, but there is sound and other functions work, there is a high probability of a malfunction of the display backlight LEDs or the LED driver (V320BJ6-PE1 Rev.C1 panel backlight unit power converter).
In most cases of lack of backlighting, it becomes necessary to disassemble the panel in order to check the LEDs, connectors, loops and all contact connections. If one or more LEDs do not work in one line, then they are broken and should be replaced.
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.
On the T.VST59S.81 motherboard, in case of a malfunction, you should first check the operability of all stabilizers and power converters of microcircuits, as well as, if necessary, update the software (software).
When repairing an MB board, you need to check its components CPU: TSUMV59XES, FLASH: GD25Q32, SOUND: TPA3110D2. Defective elements must be replaced. If BGA chips are installed, their failure is usually localized by warming up.
Before replacing the CDT-3NP5I1-10 tuner, if there is no tuning to the channels, you must first check the software and the supply voltage at its terminals. You also need to make sure that the tuner and processor can exchange data via the I2C bus
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.Attention! Users and owners of M32AM8 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 may lead to the complete non-repairability of the device.
The appearance of the MainBoard T.VST59S.81 is shown in the figure below:T.VST59S.81
It is advisable to start repairing the T.VST59S.81 motherboard, made on the basis of the TSUMV59Xxx multifunctional processor, by checking the operability of linear stabilizers or voltage converters necessary to provide power to the processor nodes - power supply of the core 1.2V, DDR memory 1.8V and Stand-by 3.3V mode ... In the absence of an image, but with a working backlight of the display, you should check the supply voltage of the LCD panel 5V or 12V, depending on the type of panel used.
T.VST59S.81 can be used in TVs:
DNS M32AM8 (Panel V320BJ6-PE1 Rev.C1), HYUNDAI H-LED32V13 (Panel HV320WX2-201).
External view of the power supply
Main features of the DNS M32AM8 device:
Installed matrix (LED panel) V320BJ6-PE1 Rev. C1.
Matrix control uses Timing Controller (T-CON) V320BJ3-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 M32AM8 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.VST59S.81 module, using CPU chips: TSUMV59XES, FLASH: GD25Q32, SOUND: TPA3110D2 and others.
The CDT-3NP5I1-10 tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V320BJ6-PE1
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 1%), Hard coating (3H)
Glass Depth: 0.50 + 0.50 mm
Transmissivity: 6.0% (with Polarizer)
Contrast Ratio: 3000: 1
Display Colors: 16.7M (6-bit + Hi-FRC)
Response Time: 8.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
DNS M32AM8 TV with LCD V320BJ6-PE1, 32 "(81 cm) 16: 9 format diagonal. The required screen brightness of 350 cd / m² is provided by LED backlighting. Contrast - the ratio of maximum to minimum brightness is 5000: 1. The LCD panel uses direct pixel backlighting with direct LEDs.
The V320BJ6-PE1 Rev. C1 sensor and the MainBoard T.VST59S.81 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, MPEG4, DivX, MKV, JPEG.
Speaker power 20 W (2x10 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, audio x2, component, SCART, VGA, HDMI x2, USB. A headphone output is provided. 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 TV uses the KW-PLE320301A power supply.
Dimensions: With stand 745x504x185 mm, Without stand 745x449x80 mm.
TV weight: 6.1 kg.
Attention! Panel V320BJ6-PE1 Rev. C1 DNS M32AM8 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.