Technical description and composition of the TV SHIVAKI STV-24LED4, type of panel and applicable modules. The composition of the modules.SHIVAKI LED
Model: STV-24LED4
Chassis / Version: T.MSD309.61B
Panel: M240HW01 V.D
LED driver (backlight): integrated into PSU
Power Supply (PSU): P.AE31.01C
MainBoard: T.MSD309.61B 12104
IC MainBoard: CPU: MSD309, SPI Flash: GD25Q32, Audio: YD1517P
Tuner: NoName
Technical Specifications STV-24LED4
SHIVAKI STV-24LED4
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-24LED4 TV, as well as the external elements of the case. 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. Swollen electrolytic or cermet capacitors, charred resistors, ring cracks in the soldered terminals of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
If the STV-24LED4 TV does not turn on, does not make any sounds when turned on, and also no indicators on the front panel light or blink - there is a high probability of a malfunction in the power module. In some cases, only the stabilizer or power converter of the control processor may be faulty, which is typical for some SHIVAKI models. Diagnostics and repair of the common power supply should always begin with a check of 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 a breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the rectifier network, as well as the large electrolytic capacitor of the filter of the rectifier network.
If a breakdown of the power switch is detected, it should be remembered that in a switching power supply (IIP) it does not fail by itself without any reasons that should be sought by checking other elements of the primary circuit - electrolytic capacitors, a PWM controller, which can only be checked replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
If, when you turn on the TV, the image appears and immediately disappears, or is absent initially when you turn on, but the sound is there and other functions work, there is a high probability of a malfunction of the LED driver (power converter for the backlight LEDs of the M240HW01 v.B panel). In such cases, the general power module is also subject to verification, in which the electrolytic capacitors of the rectifier filter supplying the LED driver should be checked.
In most cases of lack of backlight, it becomes necessary to disassemble the panel in order to check the LEDs, connectors, loops and all contact connections. If one or several LEDs does not work in one line, therefore, they are broken and should be replaced.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required.
Once again, remind users! Attempts to independently repair the SHIVAKI STV-24LED4 TV without the appropriate qualifications and experience can lead to its complete non-repairability!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Chassis MSD309B Schematic diagram
FIRMWARE FOR SPI FLASH -----------> SHIVAKI STV-24LED4, Main: T.MSD309.61B 12104, Panel: M240HW01 V.D
In case of failures in Winbond's SPI FLASH software, we recommend that you replace the chip itself with a new one. Sometimes Winbond microcircuits can recover for some time after high-temperature exposure, for example, heating with a soldering station or a lighter, which is sometimes enough to read its contents.
Repair MainBoard
MainBoard T.MSD309.61B 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.
The appearance of MainBoard T.MSD309.61B is shown in the figure below:
The appearance of the power supply
Main features of the SHIVAKI STV-24LED4 device:
Installed matrix (LED-panel) M240HW01 V.D.
To power the backlight LEDs, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the SHIVAKI STV-24LED4 TV is carried out by the P.AE31.01C power module, or its analogues.
MainBoard - the main board (motherboard) is a T.MSD309.61B module, using CPU chips: MSD309, SPI Flash: GD25Q32, Audio: YD1517P and others.
The NoName tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: M240HW01 VDQ0
Type: a-Si TFT-LCD, Panel
Diagonal size: 24.0 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 531.36x298.89 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC)
Response Time: 3.5 / 1.5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 20S4P WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V
TV SHIVAKI STV-24LED4 with LCD M240HW01, diagonal size 24 "(61 cm) 16: 9 format. The required brightness of the screen 300 cd / m² is provided by LED backlight LED. Contrast, as the ratio of maximum brightness to minimum, is 1000: 1. The LED-panel of this TV has an end LED backlight - 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 layout according to the standard 1080p (Full HD). Audio or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, JPEG.
The power of the sound system 6 W (2x3 W) provide 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, component, SCART, HDMI, 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, 1360x768, 1920x1080.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C standards.
Overall dimensions: With a support of 581x406x180 mm, Without a support of 581x371x43 mm.
TV Weight: 4.5 kg.
Attention! The M240HW01 V.D panel of the SHIVAKI STV-24LED4 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.