Technical description and composition of the SUPRA STV-LC1502 TV, panel type and modules used. The composition of the modules.SUPRA
Model: STV-LC1502
Chassis / Version: JUG7.820.534-1
Panel: HT150X02-100
MainBoard: JUG7.820.534 -1
IC MainBoard: Cpu: MST718BE-LF, Flash: 25X40AV, Ic: MP1484EN, CSC2314F, TDA9885S, TEA2025B ...
Tuner: TAF5-C21P1W 9512B6
Appearance
SUPRA STV-LC1502
General recommendations for TV LCD repair
Repair of a SUPRA TV with LS03 chassis should begin with a fault diagnosis, which involves a careful examination of the external and internal elements of the device. It often happens that visible damage to elements or connections helps determine the direction of the troubleshooting. Experienced repairers often guess about the causes of the defect and the possible consequences, for example, by ring cracks in the soldering of the element terminals, as well as by swollen capacitors or resistors burned out to coal dust and other external indirect signs.
If the STV-LC1502 TV does not turn on, does not emit any sounds when turned on, as well as no indicators on the front panel light up or blink, there is a high probability of a malfunction in the power module. In some cases, only the regulator or power converter of the control processor may be faulty, which is typical for some SUPRA models. When repairing a power supply, it is advisable to start diagnostics with checking the mains fuse and electrolytic capacitors of the filters of the secondary rectifiers of the converter. In the event of a break in the fuse, the cause should be sought in the power semiconductor elements of the pulse converter of the main power supply unit. It is necessary first of all to check the diodes of the rectifier bridge of the mains voltage and the power switch (s) of the converter.
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 for no reason 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).
In cases where the SUPRA STV-LC1502 TV has lost the image, but there is sound and all other functions are operational, there is a possibility of a malfunction of the inverter (converter for powering the backlight lamps). When you turn on the TV, the image may appear briefly and disappear immediately. It should be borne in mind that with such manifestations, the lamps themselves fail, the malfunction of which can be detected by replacing, connecting for diagnostics to the connectors that are known to be serviceable and suitable in power.
Diagnostics and repair of the inverter is often complicated by the organization of special protection circuits, which is necessary for fire safety and turns off the inverter in any abnormal situation, for example, when lamps are worn out or depressurized. Often, to localize a defect, its blocking is required.
Repair of the MST718BE motherboard must begin with diagnosing and checking all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM. Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements STV82X7-80, PT2314, TDA1517P, 34063, TDA9886,, PS25LV040, MST718BE, TEA2025B, TEA2025B, MP1484EN, CSC2314F, tuner TAF5-C2IP1W 9427BG requires the necessary training and professional skills to repair modules at the component level. Problems associated with BGA soldering technologies can be diagnosed by the warm-up method.
It should be remembered! Attempts to repair the SUPRA STV-LC1502 TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> JUG7.820.534-1 MST718BE
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC1502 V2106. JUG7.820.534-1
The appearance of the MainBoard JUG7.820.534 is shown in the figure below:JUG7.820.534
JUG7.820.534 can be used in TVs:
AKAI LTA-19N508HCP (Panel HT190WG1-600), AKAI LTA-15N602M (Panel HT150X02-100), SUPRA STV-LC1502 (Panel HT150X02-100).
Main features of SUPRA STV-LC1502 device:
Installed matrix (LCD panel) HT150X02-100.
The required supply voltages for all nodes of the SUPRA STV-LC1502 TV are provided by a switching power supply.
MainBoard - the main board (motherboard) is a JUG7.820.534 module, using Cpu chips: MST718BE-LF, Flash: 25X40AV, Ic: MP1484EN, CSC2314F, TDA9885S, TEA2025B ... and others.
The TAF5-C21P1W 9512B6 tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: BOE
Model: HT150X02-100
Type: a-Si TFT-LCD, Panel
Diagonal size: 15.0 inch
Resolution: 1024x768, XGA
Display Mode: TN, Normally White, Transmissive
Active Area: 304.128x228.096 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 500: 1
Display Colors: 16.2M (6-bit + FRC), CIE1931 60%
Response Time: 2/6 (Tr / Td)
Frequency: 60Hz
Lamp Type: 2 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 20 pins
Voltage: 3.3V