Technical description and composition of the TOSHIBA 20SLDT1 TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 20SLDT1
Panel: A201SN02 V.5
Inverter (backlight): AD2006 rev2.3
PWM Inverter: OZ9938GN (16H) PL
Power Supply (PSU): AD2006 rev2.3
PWM Power: STK0765, SG5842JA (SO-8)
MOSFET Power: LT6206 BD6215 (8) PL
MainBoard: DTV20_TSB
IC MainBoard: CPU: MST718, MT1389DE (DVD); Scaler: HY57V641620ETP-H; NAND Flash: MX29LV160BBTC-70G; EEPROM: 24C16; SOUND: TDA 7266SA;
Tuner: JS-6B1 / 111
Control: RC-32TR (HUAYU RM-0602)
Specifications 20SLDT1
TOSHIBA 20SLDT1
General recommendations for repairing TV LCD
It is advisable to start any repair and diagnostics of the TOSHIBA 20SLDT1 TV with a careful external examination of the internal and external elements, including case parts, display, buttons and cables. It often happens that some damage to elements or connections will help determine the correct direction of troubleshooting and localization of the defect. In most cases, the repairman can guess the causes of the defect and possible consequences by the characteristic signs of typical TV defects, for example, ring cracks formed in the soldering of element leads, swollen rectifier filter capacitors, charred resistors and other circuit elements.
In the absence of any signs of operability, when the TOSHIBA 20SLDT1 does not turn on and does not signal anything with the control lights on the panel, the AD2006 rev2.3 power supply module is most likely faulty. In this case, the diagnosis and repair of the common power supply should always be started by checking the mains fuse. When it is broken, it is advisable to check for a breakdown, first of all, all power semiconductor elements of the converter and the rectifier diode bridge of the network, as well as the large electrolytic capacitor of the filter of the network rectifier and the key transistor diode x2 LT6206 BD6215 (8) pl.
If a breakdown of the power switch of the flyback converter of the power supply unit is detected, it should be remembered that it does not fail without any reasons that should be sought by checking other elements of the primary circuit - electrolytic capacitors, PWM controller STK0765 SG5842JA (8n) pl, which can only be checked replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
Diagnostics of power modules with a Power Factor Corrector (CMC) is somewhat more complicated and requires a more detailed approach.
If the TOSHIBA 20SLDT1 does not have an image, but there is sound and the TV is controlled from the remote control, a malfunction in the display backlight nodes is likely. The lamps or the power converter - inverter may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the inverter, and check the LCD lamps by connecting external and obviously serviceable for diagnosis to the connectors.
In most cases, the diagnosis and repair of the AD2006 rev2.3 inverter is difficult due to the organization of protection, which turns it off in emergency cases to avoid fires during short circuits or breaks in high-voltage circuits and during depressurization of lamps. Often, repairmen block the protection circuits in order to make the necessary measurements at the control points of the inverter to identify the causes of the defect.
Turning off the protection for diagnostic purposes, it must be remembered that in this case there is a risk of failure of the power elements of the inverter. Upon completion of the diagnosis, all regular protection circuits should be restored.
In some cases, to repair the MB board (SSB), it may be necessary to replace the chips - 24C16, TDA 7266SA, with new or obviously working ones.
If you suspect a malfunction of the JS-6B1 / 111 tuner, first of all, you need to make sure that the varicaps supply voltage (30-33V) is on the corresponding output of the tuner, as well as other voltage supplying it.
Attention to the owners! Attempts to self-repair the TOSHIBA 20SLDT1 TV are not recommended by the manufacturer and can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 20SLDT1
Service Manuals with Schematic Diagrams 20 pages 2007 on model 20SLDT1
The appearance of the MainBoard DTV20_TSB is shown in the figure below:DTV20_TSB
Main features of the TOSHIBA 20SLDT1 device:
Installed matrix (LCD panel) A201SN02 V.5.
An AD2006 inverter is used to power the backlight, controlled by an OZ9938GN PWM controller (16n), pl.
The necessary supply voltages for all nodes of the TOSHIBA 20SLDT1 TV are generated by the AD2006 power supply module or its analogs using STK0765, SG5842JA (SO-8) microchips and power switches of the LT6206 BD6215 type (8) pl.
MainBoard - the main board (motherboard) is a DTV20_TSB module using CPU chips: MST718, MT1389DE (DVD); Scaler: HY57V641620ETP-H; NAND Flash: MX29LV160BBTC-70G; EEPROM: 24C16; SOUND: TDA 7266SA; and others.
The tuner JS-6B1 / 111 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: A201SN02 V5
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.1 inch
Resolution: 800x600, SVGA
Display Mode: TN, Normally White, Transmissive
Active Area: 408x306 mm
Surface: Antiglare
Brightness: 450 cd / m²
Contrast Ratio: 700: 1
Display Colors: 16.2M (6-bit + FRC), CIE1931 72%
Response Time: 11/5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Without Driver
Signal Interface: TTL (1 ch, 8-bit), 50 pins
Voltage: 5.0V
TOSHIBA 20SLDT1 LCD TV with A201SN02 LCD, diagonal size 20 "(51 cm) in 4: 3 format. The brightness of the screen is 450 cd / m² by CCFL (EEFL) fluorescent lamps. The ratio of maximum brightness to minimum (contrast) is 500: 1. The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation takes place in the standards 480i, 480p, 576i, 576p, 720p, 1080i. Supported media file formats: MP3, WMA, MPEG4, VideoCD, JPEG.
The power of the speaker system is 5 W (2 x 2.5 W). It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV x2, audio x4, S-Video, component, VGA. 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.
The power consumed by the TV in the operating mode from the network is 85 watts.
Overall dimensions: with a support of 591x405x158 mm, without a support of 591x373x88 mm.
The mass of the TV: 11.2 kg.
Attention! The A201SN02 V.5 panel of the TOSHIBA 20SLDT1 LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!