Technical description and composition of the DIGITAL DL-20J85 TV, panel type and applicable modules. The composition of the modules.Digital
Model: DL-20J85
Chassis / Version: JPE-MST718 MODEL: S7
Panel: M201EW02
Lamp backlight: 4 Lamp CCFL
Inverter (backlight): 12V 4 Lamp CCFL
MainBoard: JPE-MST718
IC MainBoard: MST718BU-LF PS25LV020 SC7314S TDA9886TS TDA1517
Tuner: ET-5C511-BS1C
Technical Specifications DL-20J85
DIGITAL DL-20J85
General recommendations for repairing TV LCD
Possible manifestations of defects
- DIGITAL DL-20J85 does not turn on at all and does not show any signs of operability. Does not blink indicators and does not respond to control buttons.
With such manifestations, in most cases, the power module is faulty. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary first of all to check the power switches and rectifier diodes for a possible partial or complete breakdown.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during short circuit in the elements of the primary circuit, the main fuse usually breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, power supply, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback. The PWM chip can also cause a malfunction of the power switch of the converter and is checked by replacement.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
These manifestations can be triggered by the power module, or by inverter defects, as well as by the distortion of the currents in the lamps due to their uneven wear. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of the transformers for an open.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the JPE-MST718 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Testing or replacing elements MST718BU-LF PS25LV020 SC7314S TDA9886TS TDA1517 requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
Before changing the tuner ET-5C511-BS1C, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
It should be remembered! Attempts to independently repair the DIGITAL DL-20J85 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!
Diagonal of 20 inches, 16: 9, Resolution 1024x768, Support HD 720p, Brightness 500 cd / m2, Contrast 800: 1, Viewing angle 178 °
The appearance of the MainBoard JPE-MST718 is shown in the figure below:JPE-MST718
JPE-MST718 can be used in TVs:
DIGITAL DL-15J82 (Panel M150XN07), DIGITAL DL-20J80 (Panel SVA201VG01TB), DIGITAL DL-20J85 (Panel M201EW02), DIGITAL DL-26J82 (Panel T260XW02), DIGITAL DL-32J82 (Panel T315XW02).
Main features of the DIGITAL DL-20J85 device:
Installed matrix (LCD-panel) M201EW02.
A 12V inverter is used to power the backlight.
The required supply voltage for all nodes of the TV DIGITAL DL-20J85 provides a switching power supply.
MainBoard - the main board (motherboard) is a module JPE-MST718, using chips MST718BU-LF PS25LV020 SC7314S TDA9886TS TDA1517 and others.
The ET-5C511-BS1C tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: M201EW02 VG
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.1 inch
Resolution: 1680x1050, WSXGA +
Display Mode: TN, Normally White, Transmissive
Active Area: 433.44x270.9 mm
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC)
Frequency: 60Hz
Signal Interface: LVDS (2 ch, 8-bit)
