Technical description and composition of the DIGITAL DL-20C2 TV, type of panel and applicable modules. The composition of the modules.Digital
Model: DL-20C2
Chassis / Version: PLHM0
Panel: 20 inch
Lamp backlight: 6 Lamp CCFL
Inverter (backlight): AT-6201LGP
PWM Inverter: BIT3105
MOSFET Inverter: 4501GM
Power Supply (PSU): Adapter 12V
Mainboard: PLHM0
IC MainBoard: TDA9567H / N3 / 5, MTL015F, MSP3410G B8 V3, TDA9181T 6161F, 24C16, 6161F, TDA7268ZA
Tuner: PLCT01 - LT201CC / LTW17AD
Control: RR3600B
Appearance
DIGITAL DL-20C2
General recommendations for repairing TV LCD
Possible malfunctions
- The DIGITAL DL-20C2 TV does not turn on, does not respond to the remote control and the control panel buttons, and does not blink with any indicators.
In such cases, the fault should be sought first in the Adapter power module.
The owner of the TV can purchase an external power supply unit such as Adapter and repairing it is not always advisable. In any case, the simplest typical defects characteristic of most IIP schemes can be easily detected and eliminated after opening. It is necessary to measure its secondary output voltages, 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, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
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. 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 enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the MAIN_PCB 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). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - TDA9567H / N3 / 5, MTL015F, MSP3410G B8 V3, TDA9181T 6161F, 24C16, 6161F, TDA7268ZA and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
If the TV works normally from external devices, but does not tune into television channels, the tuner PLCT01 - LT201CC / LTW17AD may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Attention TV owners! Attempts at self-repair of DIGITAL DL-20C2 are not recommended by the manufacturer and can lead to serious negative consequences!
Main features of the DIGITAL DL-20C2 device:
Installed matrix (LCD-panel) 20 inches.
An AT-6201LGP inverter is used to power the backlight, controlled by a BIT3105 PWM controller. As power elements of the inverter, keys of the type 4501GM are used.
To power all internal nodes of the DIGITAL DL-20C2 TV, an external adapter 12V type is used.
MainBoard - the main board (motherboard) is a PLHM0 module, using TDA9567H / N3 / 5, MTL015F, MSP3410G B8 V3, TDA9181T 6161F, 24C16, 6161F, TDA7268ZA and others.
Tuner PLCT01 - LT201CC / LTW17AD provides the reception of television programs and tuning to channels.
Information from an alternative source:
TFT LCD DIGITAL DL-20C2
Motherboard :, CPU - TDA9567H / N3 / 5, ce4979, ce7584, Memory - 24С16 (starts with any firmware - first it turns on the STBY mode, and then after 10 seconds it turns on), IC201 - MTL015F, IC601 - MSP3410G B8 V3, IC502 - TDA9181T,IC181 - 6161F, IC62 - TDA7268ZA, Connector Р1903 - on the 4th leg (sel), + 5v comes to start the inverter
Invertor :,IC1 BIT3105, Q1-Q4 - 4501GM, D7,10,11,12,13 - M5C, D6,7,8,15,17,18 - 5D, Q5,6 - 1p, Q7-Q12 - A8C,RESISTORS - R681,682,805 - 5.6ohm
