Technical description and composition of the DNS V16AN36 TV, panel type and modules used. The composition of the modules.DNS LED
Model: V16AN36
Panel: N156BGE-L21 Rev. C1
T-CON: N156BG-L0A
LED driver (backlight): integrated into T-CON
Power Supply (PSU): Adapter 12V
PWM Power: PWM
MainBoard: CVMV39L-B
IC MainBoard: TSUMV29LU
Tuner: CDT-3SP5I2-37
Specifications V16AN36
DNS V16AN36
General recommendations for TV LCD LED repair
Sometimes the DNS V16AN36 TV just won't turn on. No control lamps on the front panel are on or blinking, the TV does not respond to the remote control and does not emit any sounds or any signs of life when turned on. The most probable cause of the malfunction is the failure of the common adapter 12V power supply module. If it is working properly, it is necessary to check the standby power cells on the Main Board. 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 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 a break in the fuse, or a short circuit in the loads.
If a breakdown of the power switch is detected, it should be remembered that in a switching power supply (SMPS) it does not fail by itself without reasons that should be looked for by checking other elements of the primary circuit - electrolytic capacitors, PWM controller PWM, which can be checked only by replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
If the DNS V16AN36 does not have an image, but there is sound and the TV is controlled from the remote control, a malfunction in the N156BGE-L21 Rev.C1 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.
To check the health of the LEDs, as well as the contact connections in the ruler circuit, it is necessary to disassemble the panel.
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, and 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 the 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 of the CVMV39L-B motherboard must begin with diagnostics and testing of all linear stabilizers and power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
Often the MB (SSB) board must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - TSUMV29LU and replace the failed chips with new ones. Some malfunctions may be associated with the use of BGA soldering technologies in modern Main Board. Typically, such defects are detected by local heating of the chip.
If you suspect a malfunction of the CDT-3SP5I2-37 tuner, first of all you need to make sure that the software is correct, as well as the presence of the required supply voltage levels and pulses of data exchange with the processor via the I2C bus on the corresponding tuner pins.
Owners and users of the DNS V16AN36 TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to the complete non-repairability of the device!
Additional MainBoard RepairThe appearance of the MainBoard CVMV39L-B is shown in the figure below:
CVMV39L-B
Main features of the DNS V16AN36 device:
Installed matrix (LED-panel) N156BGE-L21 Rev. C1.
Matrix control uses the N156BG-L0A Timing Controller (T-CON).
The integrated LED driver is used to power the backlight LEDs.
To power all internal nodes of the DNS V16AN36 TV, an external adapter type 12V is used using PWM microcircuits.
MainBoard - the main board (motherboard) is a CVMV39L-B module, using TSUMV29LU microcircuits and others.
The CDT-3SP5I2-37 tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: N156BGE-L21 61 Compatible model
Type: a-Si TFT-LCD, Panel
Diagonal size: 15.6 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 344.232x193.536 mm
Shape Style: Wedge (PCBA Bent, Depth? 5.2mm)
Surface: Glare (Haze 0%), Hard coating (3H)
Brightness: 220 cd / m²
Contrast Ratio: 650: 1
Display Colors: 262K (6-bit), CIE1931 60%
Response Time: 3/8 (Tr / Td)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 6-bit), 40 pins
Voltage: 3.3V
DNS TV V16AN36 with LCD N156BGE-L21, diagonal size 16 "(41 cm) 16: 9 format. The required screen brightness of 250 cd / m² is provided by LED backlighting. Contrast - the ratio of maximum to minimum brightness is 2000: 1. Dynamic contrast ratio of 40,000: 1 is achieved by special control of the LEDs depending on the illumination of areas in the scene.This model uses a panel with edge-mounted backlight LEDs - Edge LED.
The N156BGE-L21 Rev. C1 sensor and MainBoard CVMV39L-B software provide high quality HD 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 formation of a digital signal occurs in the 480i, 480p, 576i, 576p, 720p standards.
Speaker power 6 W (2x3 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, SCART, VGA, HDMI. 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 power consumed by the TV operating in mains mode is 30 W. Power supply Adapter.
Overall dimensions: 393x292x120 mm.
TV weight: 1.7 kg.
Attention! The panel N156BGE-L21 Rev. C1 of the DNS V16AN36 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.