Technical description and composition of the TV SHIVAKI STV-19LEDG7, type of panel and applicable modules. The composition of the modules.SHIVAKI LED
Model: STV-19LEDG7
Panel: MT185GW01 V.1
LED driver (backlight): DK0AAK307600
Power Supply (PSU): RS-300 12v 3a
PWM Power: XN1049DP (8)
MOSFET Power: AUK P40716 K0460
MainBoard: DK0AN917034 MSD308PV7.0 MT215DW01V.1
SHIVAKI LED
Model: STV-19LEDG7
Chassis / Version: M309S21R1TA MSD309PV7.0-A
Panel: LQ185T1LGN3 // MT185GW01 V.1
Power Supply (PSU): Adapter 12V
MainBoard: MSD309PV7.0-A // MSD308PV7.0-A
IC MainBoard: MSD309PX-LF-Z1, MX25L3205D
Technical Specifications STV-19LEDG7
SHIVAKI STV-19LEDG7
General repair guidelines for TV LCD LED
Repair of electronic equipment usually begins with its external inspection and diagnosis of the malfunction. In this case, you should examine all the internal components of the SHIVAKI STV-19LEDG7 TV, as well as the external elements of the case. Often, based on certain external signs, it may be possible to draw certain conclusions about the reasons for the failure of certain elements of the circuit even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
If the power supply module malfunctions, the external manifestations may be different, for example, the SHIVAKI STV-19LEDG7 does not turn on at all and there is no indication of the indicator lights on the front panel. With the same symptoms, the stabilizer (converter) of the power supply to the control processor may be faulty. When diagnosing and repairing the power supply, first of all, replace the swollen capacitors of the filter of the secondary rectifiers and check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module — rectifier diodes and transistors in the primary circuit.
The reasons for the breakdown of the power switch in pulsed power supplies (IIPS) can be different, for example, a malfunction of semiconductor cells or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM controller chip or broken resistors in its bundle.
If the SHIVAKI STV-19LEDG7 does not have an image, but there is sound, the backlight LEDs of the LQ185T1LGN3 panel or their power converter may malfunction. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working.
Often there is a need for disassembling the panel to check the health of the LEDs, as well as contact connections in the connectors and soldering.
When trying to detect a break in the LED lines, it should be taken into account that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
On the motherboard MSD309PX-LF-Z1 LTM185AT01, in the event of a malfunction, you should first check the operation of all the stabilizers or power converters of the microcircuits and, if necessary, update the software (software).
Remember! Attempts to self-repair by users of the SHIVAKI STV-19LEDG7 TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Chassis MSD309B Schematic diagram
The appearance of the MainBoard MSD309PV7.0-A is shown in the figure below:MainBoard MSD309PV7.0-A uses the MSD309B processor, DDRAM random access memory (RAM) in BGA version and SPI Flash ROM type 25Q32 (4Mb).
It is advisable to start the repair of the motherboard by checking the voltage converters and linear stabilizers necessary to provide power to the nodes in operating and standby mode. The processor core is powered by + 1.5V. Also, the processor voltage requires + 2.5V and + 3.3V.
If the display backlight is working properly and there is no image, it is necessary to check the panel power (depending on the type, + 5V or + 12V), which is more convenient to measure directly on the LVDS connector. If, in the presence of all the supply voltages, the TV does not enter the operating mode, does not respond to the Remote Control and control buttons, you should update the SPI Flash firmware.
MSD309PV7.0-A can be used in TVs:
SHIVAKI STV-19LEDG7 (Panel LQ185T1LGN3), SHIVAKI STV-24LEDGR7 (Panel M236H1-L01), SHIVAKI STV-22LEDG8 (Panel CLAA215FA04).
Main features of the SHIVAKI STV-19LEDG7 device:
Installed matrix (LED-panel) LQ185T1LGN3 or MT185GW01 V.1.
To power all the internal components of the SHIVAKI STV-19LEDG7 TV, an external adapter 12V type is used.
MainBoard - the main board (motherboard) is a module MSD309PV7.0-A, using microchips MSD309PX-LF-Z1, MX25L3205D and others.
Additional technical information about the panel:
Brand: SHARP
Model: LQ185T1LGN3
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit)
Response Time: 1.5 / 3.5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 13S2Px3x2CN WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
TV SHIVAKI STV-19LEDG7 with LCD LQ185T1LGN3, diagonal size 19 "(48 cm) 16: 9 format. The required brightness of the screen 250 cd / m² is provided by LED backlight LED. Contrast, as the ratio of maximum brightness to minimum, is 1000: 1. Edge LED backlighting is implemented in the LED-panel of this TV - Edge LED. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog systems emah PAL, SECAM, NTSC. Graphic processing and formation takes place in the digital signal standards 480i, 480p, 576i, 576p, 720p, 1080i.
The power of the acoustic system of sound 20 W (2X10 W) is provided by two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), S-Video, component, SCART, VGA, HDMI x2, USB. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768.
The digital tuner is capable of receiving television channels in DVB-T MPEG4 standards.
Overall dimensions: With a support of 581x406x180 mm, Without a support of 581x371x43 mm.
Attention! The LQ185T1LGN3 panel of a SHIVAKI STV-19LEDG7 LED TV is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.
