Technical description and composition of the SITRONICS LCD-2011 TV, panel type and applicable modules. The composition of the modules.Sitronics
Model: LCD-2011
Panel: 20 inch
PWM Inverter: INV0304 V1.00 P / N: 70200027
Power Supply (PSU): Adapter 12V
MainBoard: RSAG7.820.263A-2, RSAG7.820.234A - 1
IC MainBoard: PW1306-20Q, STV2248, MSP3410
Tuner: TDQ-6F6 / W126H
Appearance
SITRONICS LCD-2011
General repair guidelines for TV LCD
TV Sitronics LCD-2011, like any other, it is advisable to start repairing by examining the internal and external visible physical visual changes. Any external damage can sometimes prompt the repairman to take further steps to determine the malfunction of the TV and localize the defect. Electrolytic capacitors of filters with a swollen body, as well as ring cracks or a layer of coal on burned-out resistors formed in soldered terminals of heating elements, sometimes tell the repairman the causes of the malfunction and possible consequences.
If the TV does not turn on, no indicators on its front panel light or blink. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when turned on, there is a certain probability that the power module is defective and needs repair. Sometimes with similar manifestations a problem may occur only in the absence of processor power, but this happens much less often. In this case, the diagnosis and repair of the common power supply should always be started by checking the mains fuse. When it breaks, 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.
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 for no reason, which should be sought by checking other elements of the primary circuit - electrolytic capacitors, a PWM controller that can only be checked by replacement, as well as others semiconductor elements (diodes, transistors, zener diodes).
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 Sitronics LCD-2011 TV does not have an image, but there is sound, then the malfunction should be sought in the backlight lamp power converter (inverter). It is also necessary to check the serviceability of the electrolytic capacitors of the filter of the secondary rectifiers of the BP (power supply) for an overstated ESR.
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.
When diagnosing with the protection off, special precautions must be taken, because there is a risk of failure of the power elements of the inverter. After the diagnosis, it is imperative to restore the protection circuits for the inverter to operate normally.
Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements STV2248 MSP3410 PW1306-20Q.
Once again, remind users! Attempts to self-repair a Sitronics LCD-2011 TV without the appropriate qualifications and experience can lead to its complete failure to repair!
All technical documentation on the LCD-2011 model - a service manual with a diagram in pdf format, photos, software (firmware) and repair recommendations can be downloaded in one file:
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> sitronics-lcd-2011.rar
20-inch diagonal, 4: 3 screen aspect ratio, 176 ° viewing angleMain features of the SITRONICS LCD-2011 device:
Installed matrix (LCD-panel) 20 inches.
To power the backlight, a converter is used, controlled by the PWM controller INV0304 V1.00 P / N: 70200027.
An external adapter 12V type is used to power all the internal components of the SITRONICS LCD-2011 TV.
MainBoard - the main board (motherboard) is an RSAG7.820.263A-2 module, using PW1306-20Q, STV2248, MSP3410 and others.
The TDQ-6F6 / W126H tuner provides television reception and channel tuning.