Technical description and composition of the TOSHIBA 19W330DG TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 19W330DG
Chassis / Version: TDM1300
Panel: 19 inch HD Ready 1440x900
Inverter (backlight): CCFL inverter
Power Supply (PSU): Adapter 20V 7.5A
MainBoard: TDM1300
IC MainBoard: MST517A-M, 24LC32A, M29W160B, VCT4932, TEA6422D, UPD6111, TDA1905
Tuner: TECH2949PG40B
Control: CT-8003
Appearance
TOSHIBA 19W330DG
General recommendations for repairing TV LCD
It is advisable to start repairing the TOSHIBA 19W330DG TV with an external examination of all its constituent elements, both internal electronic components and external. Inspection is also subject to body elements, control buttons, screen, connectors and cords. In some cases, visible external damage to the elements can suggest directions for troubleshooting and localizing the defect before starting the necessary measurements at the control points of the nodes of electronic circuits. 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.
If the power supply module malfunctions, external manifestations may be different, for example, the TOSHIBA 19W330DG does not turn on at all and there is no indication of the indicator lights on the front panel. The diagnostics of the power supply should always be started by checking the fuse and, if it is broken, it is first necessary to check the rectifier bridge diodes and the power switch for the possibility of an avalanche or thermal breakdown.
As a rule, the keys of flyback converters, which use an N-Fet field effect transistor on a separate radiator, or integrated with a PWM controller in a single chip, are reliable enough and rarely fail for no reason. The reasons for the breakdown of the key should be sought by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
It is somewhat more difficult to look for a malfunction in the converter of the power module with an active KKM (power factor corrector).
If the TOSHIBA 19W330DG does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction of the display backlight, or their power converter - inverter. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the inverter itself, including in the secondary rectifier of the main PSU.
Diagnostics of the inverter can be difficult due to the operation of the protection, which is organized by the designers to prevent negative consequences or fires in emergency cases, for example, during short circuits or breaks in the lamp power supply circuit, as well as their possible depressurization. To make the necessary measurements at control points or to take the necessary waveforms, repairmen have to block the protection circuits in order to be able to diagnose.
In these cases, special care must be taken in view of the risk of failure of the power elements. After completing all repair work, it is imperative to restore the protection circuits for full and safe further operation of the TV by the user.
Owners and users of the TOSHIBA 19W330DG TV must remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 19W330DG
Main features of the TOSHIBA 19W330DG device:
Installed matrix (LCD-panel) 19 inch HD Ready 1440x900.The CCFL inverter is used to power the backlight.
To power all the internal components of the TOSHIBA 19W330DG TV, an external adapter type 20V 7.5A is used.
MainBoard - the main board (motherboard) is a TDM1300 module, using microchips MST517A-M, 24LC32A, M29W160B, VCT4932, TEA6422D, UPD6111, TDA1905 and others.
The TECH2949PG40B tuner provides television reception and channel tuning.