Technical description and composition of the DNS S19ASL1 TV, panel type and modules used. The composition of the modules.DNS LED
Model: S19ASL1
Panel: T185D01-L01 REV: 01
LED driver (backlight): integrated into PSU
PWM LED driver: PWM 8pin
Power Supply (PSU): ER933S VER: 1.0
PWM Power: PWM SOT23-6
MainBoard: ST239-F12G
IC MainBoard: PSU: TSUMV59XE-Z1, Spi Flash: 25Q32, Audio: YD1517P
Tuner: NoName
Specifications S19ASL1
DNS S19ASL1
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- TV DNS S19ASL1 does not turn on and does not give any signs of turning on, does not respond to control buttons and to the remote control
In such cases, the fault should be looked for primarily in the ER933S power module. It is necessary to measure the output voltages in its secondary circuits, and in the event of their complete absence, the serviceability of the power switches and rectifier diodes should be checked for a possible breakdown (short circuit).
In case of diode breakdowns in the secondary circuits, the converter can operate in an emergency mode of short circuit without output voltages, and in case of a short circuit in the power elements of the primary circuit, the mains fuse and / or the current sensor in the source of the key usually breaks off.
Breakdown of power switches (MosFet) in switching sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency setting or damper, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM controllers (PWM) PWM SOT23-6, if they do not have visible damage to the case and an open short circuit between the pins, are usually checked by replacing.
- There is no picture, but there is sound and reaction to commands from the remote control. Or the image appears immediately after switching on and disappears.
A malfunction is usually in these cases most likely in the backlight units of the display matrix. The reason may be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
To identify an open circuit in the LED lines without disassembling the panel, a current source is required. It is impossible to open the junctions connected in series with a simple multimeter; a voltage of several tens of volts is required.- The TV does not turn on, the indicator signals the standby or operating mode, or blinks.
Repair or diagnostics of the ST239-F12G motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and matrix. If necessary, you should update or replace the software (software). When repairing an MB board, you need to check its components PSU: TSUMV59XE-Z1, Spi Flash: 25Q32, Audio: YD1517P. Defective elements must be replaced. If chips with BGA soldering technology are used, the problem in its implementation is detected by local heating of the chip.
If you suspect a malfunction of the NoName tuner, first of all, you need to make sure that the software is correct, as well as the presence of the necessary levels of supply voltages and pulses of data exchange with the processor via the I2C bus on the corresponding outputs of the tuner.
Users and owners of TVs should remember that attempts to repair the DNS S19ASL1 TV on their own without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> DNS S19ASL1 , Main: ST239-F12G, Panel: T185D01-L01 REV:01
The appearance of the MainBoard ST239-F12G is shown in the figure below:ST239-F12G
Main features of the DNS S19ASL1 device:
Installed matrix (LED panel) T185D01-L01 REV: 01.
To power the backlight LEDs, a converter combined with a power supply is used, controlled by a PWM 8pin PWM controller.
The formation of the necessary supply voltages for all nodes of the DNS S19ASL1 TV is carried out by the ER933S power module, or its analogs using PWM SOT23-6 microcircuits.
MainBoard - the main board (motherboard) is an ST239-F12G module, using PSU chips: TSUMV59XE-Z1, Spi Flash: 25Q32, Audio: YD1517P and others.
Tuner NoName provides reception of television programs and tuning to channels.
DNS TV S19ASL1 with LCD T185D01-L01, diagonal 19 "(48 cm) in 16: 9 format. The required screen brightness of 200 cd / m² is provided by LED backlighting. Contrast - the ratio of maximum to minimum brightness is 1000: 1. This model uses a panel with an edge LED backlight - Edge LED.
T185D01-L01 REV: 01 sensor and MainBoard ST239-F12G 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 digital signal shaping takes place in the 480i, 480p, 576i, 576p, 720p standards. Supported media file formats: MP3, MPEG4, DivX, MKV, JPEG.
Speaker power of 10 W (2x5 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, VGA, HDMI, 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 an ER933S power supply.
Dimensions: With stand 438x310x165 mm, Without stand 438x268x50 mm.
TV weight: 2.6 kg.
Attention! Panel T185D01-L01 REV: 01 LED TV DNS S19ASL1 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.