Technical description and composition of the TV SHIVAKI STV-24LEDGR7, type of panel and applicable modules. The composition of the modules.SHIVAKI LED
Model: STV-24LEDGR7
Chassis / Version: MSD309PV7.0-A
Panel: M236H1-L01
T-CON: M240HW01 V6 CTRL BD
Power Supply (PSU): Adapter 12V
MainBoard: MSD309PV7.0-A
IC MainBoard: Cpu: MSD309PX-LF-Z1, Spi Flash: 25L3206E
Technical Specifications STV-24LEDGR7
SHIVAKI STV-24LEDGR7
General repair guidelines for TV LCD LED
Repair of electronic devices, including the SHIVAKI STV-24LEDGR7 TV, it is advisable to start with an external examination of its external and internal elements. In some cases, visible external damage to the elements can suggest the direction of troubleshooting and localization of the defect even before the start of the necessary measurements at the control points of the nodes of electronic circuits. 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.
Sometimes the SHIVAKI STV-24LEDGR7 TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is a failure of the common power module. If it is working properly, you need to check the processor batteries on the SSB (Main Board). In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should be started by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
In most cases, key breakdowns in switching power supplies (SMPS) do not occur for no 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 dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM chip from the manufacturer.
If the SHIVAKI STV-24LEDGR7 does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction in the backlight LED circuit of the M236H1-L01 panel, or their power converter - LED driver. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the LED driver itself, including in the secondary rectifier of the main PSU.
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 diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source.
If the motherboard MSD309PV7.0-A is faulty, first of all it is necessary to check all the linear stabilizers or power converters of its chips, and also, if necessary, update the software. Sometimes you can check the health of MB only by replacement.
Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements Cpu: MSD309PX-LF-Z1, Spi Flash: 25L3206E. BGA chip malfunctions are usually easy to detect by warming up.
Remember! Attempts to self-repair by users of the SHIVAKI STV-24LEDGR7 TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Chassis MSD309B Schematic diagram
FIRMWARE FOR SPI FLASH -----------> Shivaki STV-24LEDGR7, Main MSD309PV7.0-A, Flash: 25L3206E, Panel: M236H1-L01
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-24LEDGR7 device:
Installed matrix (LED-panel) M236H1-L01.
The matrix control uses the Timing Controller (T-CON) M240HW01.
To power all the internal components of the SHIVAKI STV-24LEDGR7 TV, an external adapter 12V type is used.
MainBoard - the main board (motherboard) is an MSD309PV7.0-A module, using Cpu chips: MSD309PX-LF-Z1, Spi Flash: 25L3206E and others.
Additional technical information about the panel:
Brand: CMO
Model: M236H1-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 23.6 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 521.28x293.22 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.5 / 3.5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V
TV SHIVAKI STV-24LEDGR7 with LCD M236H1-L01, diagonal size 24 "(61 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 800: 1. The LED-panel of this TV has end-face LED backlighting - Edge LED. The design and technical capabilities of the TV include watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphic resolution according to the standard 1080p (Full HD). Input high frequency or video signal can be processed in the analog PAL, SECAM system, NTSC. Graphic processing and formation takes place in the digital signal standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p.
The power of the sound system 20 W (2x10 W) provides 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), AV, S-Video, component, SCART, VGA, HDMI x2, USB. An output for connecting headphones is provided. 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, 1280x1024, 1920x1080.
The digital tuner is capable of receiving television channels in DVB-T MPEG4 standards.
The power consumed by the TV in the operating mode from the network is 40 watts.
Overall dimensions: 580x400x180 mm.
TV mass: 6 kg.
Attention! The panel M236H1-L01 of the SHIVAKI STV-24LEDGR7 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.
