Technical description and composition of the TV SUPRA STV-LC2277FLD, type of panel and applicable modules. The composition of the modules.SUPRA LED
Model: STV-LC2277FLD
Chassis / Version: CV181L-A version V3L03
Panel: HK215LEDM-BH 1H
Power Supply (PSU): Adapter 12V
MainBoard: CV181L-A
IC MainBoard: W9425G6JH-4, 25Q32BVSIG, DC-DC MP1423DN, MP1482DS
Tuner: AFT 7 / W110G
Technical Specifications STV-LC2277FLD
SUPRA STV-LC2277FLD
General repair guidelines for TV LCD LED
Possible malfunctions
- The SUPRA STV-LC2277FLD TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
Often in such cases, the Adapter power module is faulty.
The power source in this model is an external Adapter 12V, usually TV owners can purchase them on their own, and repairing them may not be practical. But sometimes it’s easy to open the block and eliminate simple typical defects that are characteristic of most IIPs. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, it is necessary to check the serviceability of power switches and rectifier diodes for possible breakdown (short circuit).
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and a short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound and all other functions work. Sometimes when you turn on the image for a second appears and disappears.
The faulty usually in these cases is the backlight matrix (LED-panel). The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters, as a rule, light up a single 3-volt LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as a health indicator. In faulty LEDs, the zener diode will either be cut off or broken into short-circuit.
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the CV181L-A motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Sometimes they require checking or replacing (if necessary) the elements of the MainBoard board - W9425G6JH-4, 25Q32BVSIG, DC-DC MP1423DN, MP1482DS. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
AFT 7 / W110G tuner malfunction is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Attention TV owners! Self-repair attempts by SUPRA STV-LC2277FLD are not recommended by the manufacturer and can lead to serious negative consequences!
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC2277FLD, Main: CV181L-A, Spi Flash: W25Q32, Panel: BOE HM215WU3-100
In case of failures in Winbond's SPI FLASH software, sometimes they can temporarily restore their functionality after temperature exposure, for example, heating with a soldering station or a lighter. Often this is enough to be able to read the regular contents of the software. After that, the chip should be replaced with a new one.
Repair MainBoard
The appearance of the MainBoard CV181L-A is shown in the figure below:CV181L-A
As part of the CV181L-A motherboard, a multifunctional processor MST6M181VS is used, combined with a scaler (video controller-scaler). It is advisable to start the MainBoard repair by checking the power supply of the Stand-by mode, which is implemented using a separate 3.3V linear stabilizer. In the operating mode, it is necessary to check the operability of linear stabilizers or voltage converters necessary to provide power to the processor nodes: 1.2V, 2.5V, 3.3V. A voltage of 2.5 V is required to power the DDR W9425G6JH-4 random access memory. If there is no image, but the display backlight is working properly, it is advisable to measure the power of the 5V or 12V LCD panel, depending on the type of panel used, directly on the LVDS connector. If the TV does not exit Stand-by mode, does not respond to the remote control and control buttons, you should check the 3.3V power at pin 8 of the SPI FLASH chip, it may be necessary to update its software.
CV181L-A can be used in TVs:
FUSION FLTV-19T9D (Panel TB190B1Z1), FUSION FLTV-22T9D (Panel HM215WU1-500), HYUNDAI H-LED22V16 (Panel M215HW01 V.B), HYUNDAI H-LED15V6 (Panel LP156WD1 (TL)(A1)), SUPRA STV-LC2277FLD (Panel HK215LEDM-BH 1H), SUPRA STV-LC2425WL (Panel M240HW02 V.1), SUPRA STV-LC1677WL (Panel 720p HD 1366x768).
The appearance of the power supply
Main features of the SUPRA STV-LC2277FLD device:
Installed matrix (LED panel) HK215LEDM-BH 1H.
To power all internal nodes of the SUPRA STV-LC2277FLD TV, an external adapter 12V type is used.
MainBoard - the main board (motherboard) is a CV181L-A module, using microcircuits W9425G6JH-4, 25Q32BVSIG, DC-DC MP1423DN, MP1482DS and others.
The AFT 7 / W110G tuner provides TV reception and channel tuning.
LED TV SUPRA STV-LC2277FLD with LCD HK215LEDM-BH, diagonal size 22 "(56 cm) 16: 9 format. The required brightness of the screen 250 cd / m² is provided by LED backlight LED. Contrast - the ratio of maximum brightness to minimum is 700: 1. Dynamic contrast ratio of 14000: 1 is achieved by special control of the LEDs depending on the illuminance of the plot. according to the standard 1080p (Full HD). The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, DivX, VideoCD, SVCD, Picture CD, 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, audio x2, component, SCART, VGA, HDMI. 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, 1360x768, 1920x1080.
The power consumed by the TV in the operating mode from the network is 60 watts.
Overall dimensions: 536x387x187 mm.
TV Weight: 3.8 kg.
Attention! The HK215LEDM-BH 1H panel of a SUPRA STV-LC2277FLD 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.