Technical description and composition of the DIGITAL DL-20J80 TV, type of panel and applicable modules. The composition of the modules.Digital
Model: DL-20J80
Chassis / Version: JPE-MST718
Panel: SVA201VG01TB
Lamp backlight: 6 Lamp CCFL
Inverter (backlight): 6 Lamp CCFL
MainBoard: JPE-MST718
IC MainBoard: MST718BU-LF, PS25LV020, AT24C32, TDA7496, TDA9886TS
Tuner: ET-5C511-BS1A
Technical Specifications DL-20J80
DIGITAL DL-20J80
General recommendations for repairing TV LCD
Possible malfunctions
- The DIGITAL DL-20J80 TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light up and do not blink.
With such manifestations, in most cases, the power module is faulty. It is necessary to measure the output voltages in the secondary circuits, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch may be PWM (PWM). It is checked only by replacement with a known good one.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
These manifestations can be triggered by a power module, or by defects in the inverter, as well as a distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the inverter power supply are serviceable, you should make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
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). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - MST718BU-LF, PS25LV020, AT24C32, TDA7496, TDA9886TS with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
If there is no reception of television channels, but the TV is working properly from external devices, first of all you need to check the voltage of the tuner ET-5C511-BS1A and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Attention! For users and owners of DL-20J80 televisions who do not have the appropriate qualifications, knowledge and experience, we strongly do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
Diagonal of 20 inches, 4: 3, Resolution 1024x768, Support HD 720p, Brightness 500 cd / m2, Contrast 800: 1, Viewing angle 178 °Repair MainBoard
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-20J80 device:
Installed matrix (LCD panel) SVA201VG01TB.
An inverter 6 is used to power the backlight.
The required supply voltage for all nodes of the DIGITAL DL-20J80 TV provides a switching power supply.
MainBoard - the main board (motherboard) is a JPE-MST718 module, using chips MST718BU-LF, PS25LV020, AT24C32, TDA7496, TDA9886TS and others.
The ET-5C511-BS1A tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SVA-NEC
Model: SVA201VG01TB
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.1 inch
Resolution: 640x480, VGA
Display Mode: TN, Normally White, Transmissive
Active Area: 408x306 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 450: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 8 (Tr + Td)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
