Technical description and composition of the GOLDSTAR LT-19T300R TV, panel type and modules used. The composition of the modules.GoldStar LED
Model: LT-19T300R
Chassis / Version: V1N11
Panel: V185BJ1-PE1 HK185WLEDM-CH25H
T-CON: V185BJ1-XCE1
LED driver (backlight): LK-LE240404A CQC04001011196
PWM LED driver: OB3362RP
Power Supply (PSU): Adapter 12V
MainBoard: CV9202L-T
IC MainBoard: Cpu: SPV9202BD, Spi Flash: 25Q64, DDRAM: W6310GKB-12, SOUND: YD1517
Tuner: ST03WS-2A-E
Control: IR: 6003120090
LT-19T300R Specifications
GOLDSTAR LT-19T300R
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- The GoldStar LT-19T300R TV does not turn on and does not show any signs of operability at all. No response to the remote control and front panel control buttons.
In such cases, the Adapter's power supply usually fails.
The owner of the TV can purchase an external power supply of type Adapter on his own and its repair is not always advisable. In any case, the simplest typical defects typical for most SMPS circuits can be easily detected and eliminated after opening. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches and rectifier diodes in the converters for a short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in an emergency mode of a short circuit, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or the current sensor in the source of the key often breaks off.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of the PWM controller, in frequency setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) are usually checked by replacing them with new ones, or knowingly working.
- There is no image, there is sound, it reacts to the remote control, the channels are switched. In some cases, the image appears when turned on and disappears immediately.
The malfunction in most of these cases is found in the nodes and elements of the LED panel backlight. 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.
It is impossible to check the LED bars for a break 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 is required, and ideally a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters tend to light one 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 an indicator of serviceability. In faulty LEDs, the zener diode will either be cut off or broken through in the K / Z.
- The TV does not turn on, the indicator signals the standby or operating mode, or blinks.
Repair or diagnostics of the CV9202L-T motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, you should update or replace the software (software). If it is not possible to replace the MB (SSB) board, you need to check the health of its elements - Cpu: SPV9202BD, Spi Flash: 25Q64, DDRAM: W6310GKB-12, SOUND: YD1517. Defective components must be replaced.
If you suspect a malfunction of the ST03WS-2A-E 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 terminals of the tuner.
Once again, we remind TV users: do not try to repair yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repairs to professionals with sufficient experience in the field of electronic repair.
To reduce the backlight current in LED drivers with OB3362RP (TSOP16) controller, increase the total resistance of the resistors from pin 5 (ISET) to the case. The maximum current in each of the four channels (in milliamperes) for the Rset resistor (in kilo-ohms) is determined from the ratio 3000 * 1.2V / Rset.
MainBoard CV9202L-T is shown in the figure below:CV9202L-T
The MainBoard CV9202L-T uses an SPV9202BD processor, W6310GKB-12 RAM and 8Mb SPI FLASH ROM.
It is advisable to start repairing a motherboard with checking all voltage converters and linear stabilizers necessary to provide power to nodes and chips in operating and standby mode. The processor core is powered by + 1V. Also, SPV9202BD requires + 2.5V and + 3.3V to operate. Check the LCD panel power supply (depending on the type, + 5V or + 12V), it is convenient to measure directly on the LVDS connector. If, with the necessary supply voltages, the TV does not come out of Stand-by mode, does not respond to the Remote control and control buttons, you should update the SPI Flash 25Q64 firmware.
CV9202L-T can be used in TVs:
AIWA 24LE7020 (Panel V236BJ1-P01), BBK 22LEM-1006/FT2C (Panel M215HTN01.1 KM215N19-AU-01), DEXP 19A3100 (Panel CX185LEDM), DEXP 22A7100 (Panel T215HVN01.0 M215HVN01.0), FUSION FLTV-24T22 (Panel M236HGE-P02), FUSION FLTV-22T22 (Panel 720p HD 1366x768), SHIVAKI STV-24LED14 (Panel V236BJ1-P01 / CX236LEDM), SUPRA STV-LC24T410FL (Panel M236HGE-P01), SUPRA STV-LC19T410WL (Panel HK185WLEDM CH25H), SUPRA STV-LC22T410FL (Panel LC215DT5A), SUPRA STV-LC24T410WL (Panel HK236WLEDM-CH24H), SUPRA STV-LC19T880WL (Panel LC185TT7A).
Main features of the GOLDSTAR LT-19T300R device:
Installed matrix (LED panel) V185BJ1-PE1 HK185WLEDM-CH25H.
Matrix control uses the Timing Controller (T-CON) V185BJ1-XCE1.
The LED driver LK-LE240404A is used to power the backlight LEDs, it is controlled by the OB3362RP PWM controller.
To power all internal components of the GOLDSTAR LT-19T300R TV, an external adapter 12V is used.
MainBoard - the main board (motherboard) is a CV9202L-T module, using Cpu: SPV9202BD, Spi Flash: 25Q64, DDRAM: W6310GKB-12, SOUND: YD1517 and others.
The ST03WS-2A-E tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V185BJ1-PE1
Type: a-Si TFT-LCD, CELL
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare (Haze 1%)
Glass Depth: 0.50 + 0.50 mm
Transmissivity: 5.0% (with Polarizer)
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit)
Response Time: 9.0 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
TV GOLDSTAR LT-19T300R with LCD V185BJ1-PE1, diagonal size 18.5 "(47 cm) 16: 9. The required screen brightness of 250 cd / m² is provided by LED backlighting. Contrast, as the ratio of maximum brightness to minimum, is 1000: 1 Dynamic contrast ratio of 120,000: 1 is achieved by special control of the LEDs The LCD panel of the TV is equipped with direct backlighting with rear-mounted LEDs - Direct LED.It is possible to view images in high quality HD at a resolution of 1366x768 pixels in 720p (HD Ready The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal shaping occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported multimedia file formats: MP3, WMA, MPEG4.
The power of the sound system of 6 W (2x3 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, component, SCART, 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, 1280x1024, 1360x768.
The digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Dimensions: with stand 454x337x155 mm, without stand 454x337x55 mm.
TV weight: 2.75 kg.
Attention! Panel V185BJ1-PE1 HK185WLEDM-CH25H LED TV GOLDSTAR LT-19T300R 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.