Technical description and composition of the TOSHIBA 15DL72 TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 15DL72
Chassis / Version: U947-M7
Panel: LTM150XH-L06
Lamp backlight: 4 Lamp CCFL
Inverter (backlight): U004 72790330 INVERTER UNIT
Power Supply (PSU): Adapter 12V
MainBoard: U947-M7 Main PCB U001
IC MainBoard: MX88L284AEC, KS88C6348, VPC3230D, MSP3420G, TDA1517
Tuner: TCLN9081DA27D
Specifications 15DL72
TOSHIBA 15DL72
General recommendations for repairing TV LCD
Possible malfunctions
- The TOSHIBA 15DL72 TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
In some of these cases, the main switching power supply, the Adapter module, is faulty.
The external adapter 12V power supply is not always subject to repair, especially since the owner can purchase it independently. But, in some cases, it makes sense to open it and eliminate the simple typical defects inherent in converters in pulsed sources. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches and rectifier diodes in the converters for a short circuit.
In the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback circuits (OOS) of stabilization. PWM controllers (PWM), if they do not have visible damage to the chassis and open short circuit between the terminals, are usually checked by replacement.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately 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. 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, inverter protection must be disabled. 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 U947-M7 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. Verification or replacement of elements MX88L284AEC, KS88C6348, VPC3230D, MSP3420G, 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 replacing the tuner TCLN9081DA27D, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Attention to users! Independent repair of the TOSHIBA 15DL72 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> TOSHIBA 15DL72 Chassis U947-M7
The appearance of the MainBoard U947-M7 is shown in the figure below:U947-M7
Main features of the TOSHIBA 15DL72 device:
Installed matrix (LCD-panel) LTM150XH-L06.
To power the backlight used inverter U004.
To power all internal components of the TOSHIBA 15DL72 TV, an external adapter 12V type is used.
MainBoard - the main board (motherboard) is a U947-M7 module, using microchips MX88L284AEC, KS88C6348, VPC3230D, MSP3420G, TDA1517 and others.
The TCLN9081DA27D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTM150XH-L06
Type: a-Si TFT-LCD, Panel
Diagonal size: 15.0 inch
Resolution: 1024x768, XGA
Display Mode: TN, Normally White, Transmissive
Active Area: 304.1x228.1 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 400 cd / m²
Contrast Ratio: 400: 1
Display Colors: 16.2M (6-bit + FRC)
Response Time: 5/20 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 20 pins
Voltage: 3.3V
TOSHIBA 15DL72 LCD TV with LTM150XH-L06 LCD, 15 "diagonal size, 4: 3 format. 400 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. The ratio of maximum brightness to minimum (contrast) is 400: 1. The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Stereo sound is realized by two built-in speakers. It uses a stereo signal processing system NICAM and surround sound function Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV. An output for connecting headphones is provided.
Overall dimensions: 366x170x178 mm.
Attention! The TOSHIBA 15DL72 LCD TV panel LTM150XH-L06 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!