REPAIRING / SERVICING TV GOLDSTAR LT-19A310R

Technical description and composition of the GOLDSTAR LT-19A310R TV, panel type and modules used. The composition of the modules.
GoldStar LED
Model: LT-19A310R
Chassis / Version: V2L05 V2L10
Panel: M185XW01 V.F
LED backlight: 40EA3000-X1-8, 40EA3000-X1-9
T-CON: M185XW01 VF 18M02-C19
LED driver (backlight): 40-24D20D-DRE2XG
PWM LED driver: MP3389EF
Power Supply (PSU): Adapter 12V
MainBoard: 40-MS8200-MAD2XG
IC MainBoard: CPU: MST6E182VS-LF-Z1, SPI Flash GD25Q32,
Tuner: TDQ-3CB
LT-19A310R Specifications
GOLDSTAR LT-19A310R
General recommendations for TV LCD LED repair
Possible malfunctions
- GoldStar LT-19A310R does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
With such manifestations, the adapter power supply usually fails.
An external power supply Adapter 12V is not always subject to repair, especially since the owner can purchase it on his own. But, in some cases, it makes sense to open it and eliminate simple typical defects inherent in converters in pulse sources. It is necessary to measure its output voltages, and if they are absent (full or partial), the serviceability of the power switches of the converters and rectifier diodes should be checked for a possible short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in an emergency mode of short circuit without output voltages, and with a short circuit in the elements of the primary circuit, the mains fuse most often breaks off immediately and less often the current sensor in the source of the key.
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 for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
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 go into operation, does not respond to the remote control. The indicator on the front panel is on or blinking.

Repair or diagnostics of the 40-MS8200-MAD2XG motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and matrix. If necessary, you should update or replace the software (software). In cases of complex MB (SSB) repairs and with the necessary skills and equipment, it may sometimes be necessary to replace its CPU chips: MST6E182VS-LF-Z1, SPI Flash GD25Q32, and other possible faulty components. Malfunctions associated with the use of BGA soldering technologies are usually easily diagnosed by the warm-up method.

If there is no tuning for terrestrial or cable TV channels, you should make sure that the software is correct, as well as that the supply voltages on the TDQ-3CB tuner outputs are in accordance with the ratings. It is also necessary to check with an oscilloscope the presence of pulses of data exchange between the tuner and the processor via the I2C bus.

Owners of the LT-19A310R TV are advised to contact only qualified specialists with the necessary work experience for repair! Attempts to repair yourself without the appropriate knowledge and skills can lead to irreversible negative consequences!

DOWNLOAD FIRMWARE FOR SPI FLASH  ----------->   GoldStar LT-19A310R V2L05 V2L10, Main: 40-MS8200-MAD2XG, Panel: M185XW01 V.F

 To reduce the backlight current in LED drivers with a PWM controller MP3389EF (MP3389), or its analog OB3362VP (28 pin), the total resistance of the resistors from pin 9 (ISET) to the case should be proportionally increased. The maximum current in each of the 12 channels (in milliamperes) for the resistance Rset (in kilo-ohms) is determined from the ratio 1000 * 1.22V / Rset. When the channels are connected in parallel, the currents are summed up.

Additional MainBoard Repair
The appearance of the MainBoard 40-MS8200-MAD2XG is shown in the figure below:
40-MS8200-MAD2XG
40-MS8200-MAD2XG can be used in TVs:
ERISSON 39LET30 (Panel V390HJ1-P01), ERISSON 32LET30 (Panel V32D30-CSOT V2), FUSION FLTV-23L18B (Panel LTA230AP01), GoldStar LT-19A310R (Panel M185XW01 V.F), HYUNDAI H-LED32V8 (Panel T315XW06 V.8).
Main features of the GOLDSTAR LT-19A310R device:
Installed matrix (LED-panel) M185XW01 V.F.
Matrix control uses the M185XW01 Timing Controller (T-CON).
The LED driver 40-24D20D-DRE2XG is used to power the backlight LEDs and is controlled by the MP3389EF PWM controller.
To power all internal components of the GOLDSTAR LT-19A310R TV, an external adapter 12V is used.
MainBoard - the main board (motherboard) is a 40-MS8200-MAD2XG module, using CPU chips: MST6E182VS-LF-Z1, SPI Flash GD25Q32, and others.
The TDQ-3CB tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: M185XW01 VF
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, Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 3.6 / 1.4 (Tr / Td)
Frequency: 60Hz
Lamp Type: 10S4P WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
GOLDSTAR LT-19A310R TV with LCD M185XW01, diagonal 19 "(48 cm) in 16: 9 format. Contrast, as the ratio of maximum brightness to minimum brightness, is 1000: 1. The LED panel of this TV is equipped with LED backlight - Edge LED. It is possible to 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 PAL, SECAM, NTSC. Graphic processing and formation of a digital signal occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p Supported media file formats: MP3, WMA, JPEG.
The power of the acoustic system of sound 4 W (2x2 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 x2, component, VGA, HDMI, USB. To connect a computer or laptop to this TV model, use the VGA (D-Sub 15) connector on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768.
The power consumed by the TV operating in mains mode is 25 W.
Dimensions: with stand 474x352x158 mm, without stand 474x313x62 mm.
TV weight: 2.5 kg.
Attention! Panel M185XW01 V.F LED TV GOLDSTAR LT-19A310R 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.