Technical description and composition of the GOLDSTAR LT-32T440R TV, panel type and modules used. The composition of the modules.GOLDSTAR LED
Model: LT-32T440R
Chassis / Version: V1N07
Panel: LVW320NEAL CJ9W02 V4
LED driver (backlight): integrated into PSU
PWM LED driver: MAP3204T
MOSFET LED driver: MDS1903
Power Supply (PSU): 40-EL2810-PWE1XG 81-EL281C0-PL290AA.
PWM Power: 6754MR
MainBoard: MT31SR 40-MT31SR-MAD2HG GLQ114980H
IC MainBoard: CPU: MT5531NDNT 1414-BCAH, SPI Flash: 25Q64FVSIG, Audio: TAS5707, AZ1084S2-3.3, DRV632
Tuner: RE221ZN
LT-32T440R Specifications
GOLDSTAR LT-32T440R
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- TV GOLDSTAR LT-32T440R does not turn on and does not give any signs of turning on, does not respond to control buttons and to the remote control.
In such cases, the fault should be looked for primarily in the 40-EL2810-PWE1XG power module. It is then necessary to measure its output voltages and, if they are absent, the power switches and rectifier diodes of the converters should be checked for the probability of a short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can operate in an emergency mode in the short-circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse is usually cut 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 a PWM controller, in frequency setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) 6754MR are usually checked by replacing them with new ones, or knowingly working.
- There is no picture, but there is sound and reaction to the remote control. Or, for a second, the image may appear immediately after switching on.
As a rule, in such cases there is no display backlight. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
Without a special current source, it is impossible to check the line of series-connected LEDs, and it is unsafe for them to use any voltage sources over 12V for this purpose. Then all that remains is to open the panel and check each LED separately. Usually, Chinese multimeters with 9V power supply lightly light one 3-volt LED, if you connect the probes to it in the forward direction, the red probe to the anode, the black one to the cathode. For dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of the LED health. In the event of a malfunction of the LED, its zener diode will either be cut off or pierced in the K / Z.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals the standby mode.
Repair or diagnostics of the MT31SR 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). Often the MB (SSB) board must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - CPU: MT5531NDNT 1414-BCAH, SPI Flash: 25Q64FVSIG, Audio: TAS5707, AZ1084S2-3.3, DRV632 and replace the failed chips with new ones. Some malfunctions may be associated with the use of BGA soldering technologies in modern Main Board. Usually such defects are detected by local heating of the chip.
Before replacing the tuner RE221ZN, if there is no tuning to the channels, you must first check the software and the supply voltage at its outputs. You also need to make sure that the tuner and processor can exchange data via the I2C bus
Owners of the LT-32T440R 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-32T440R V1N07, Main: MT31SR 40-MT31SR-MAD2HG GLQ114980H, Panel: LVW320NEAL
The appearance of the MainBoard MT31SR is shown in the figure below:MT31SR
External view of the power supply
Main features of the GOLDSTAR LT-32T440R device:
Installed matrix (LED panel) LVW320NEAL CJ9W02 V4.
A converter combined with a power supply is used to power the backlight LEDs, and is controlled by the MAP3204T PWM controller. The keys of the MDS1903 type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the GOLDSTAR LT-32T440R TV is carried out by the 40-EL2810-PWE1XG power module, or its analogs using 6754MR microcircuits.
MainBoard - the main board (motherboard) is an MT31SR module, using CPU chips: MT5531NDNT 1414-BCAH, SPI Flash: 25Q64FVSIG, Audio: TAS5707, AZ1084S2-3.3, DRV632 and others.
Tuner RE221ZN provides reception of television programs and tuning to channels.
GOLDSTAR LT-32T440R TV with LCD LVW320NEAL, 32 "(81 cm) in 16: 9 format. The required screen brightness of 300 cd / m² is provided by LED backlighting. Contrast, as the ratio of maximum brightness to minimum, is 2000: 1. Dynamic contrast ratio of 80000: 1 is achieved by special control of the LEDs. The LED panel of this TV is equipped with edge LED backlighting. You can view images in high quality HD at a resolution of 1366x768 pixels in 720p (HD Ready). 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. Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG ...
Speaker power 10 W (2x5 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, VGA, HDMI x2, USB. A headphone output is provided. 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, 1360x768.
Overall dimensions: 735x470x200 mm.
Attention! Panel LVW320NEAL CJ9W02 V4 LED TV GOLDSTAR LT-32T440R 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.