Technical description and composition of the TOSHIBA 19SL738R TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 19SL738R
Panel: LC185EXN-SCA1
Power Supply (PSU): 75022447 PC BOARD ASSY, POWER, 19SL738F, ADTVA2404AAD
MainBoard: 715G4372 - M01-000-005B
Tuner: ENV57S0108R
Control: CT-90326
Specifications 19SL738
TOSHIBA 19SL738R
General repair guidelines for TV LCD LED
Diagnostics of malfunctions and repairs of the TOSHIBA 19SL738R, as well as other electronic devices, is recommended to begin with an external examination of the external and internal elements. According to some external signs of a change in the state of some elements, it is sometimes possible to make assumptions about the nature of the defect, as well as determine the further direction of the troubleshooting. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.
If the 19SL738R TV does not turn on, does not make any sounds when turned on, and also no indicators on the front panel light or blink - there is a high probability of a malfunction in the power module. In some cases, only the regulator or power converter of the control processor may be faulty, which is typical for some TOSHIBA models. When diagnosing and repairing the power supply, first of all, replace the swollen filter capacitors of the secondary rectifiers and check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module — rectifier diodes and transistors in the primary circuit.
It should be remembered that in the practice of repair, usually the power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
If the TOSHIBA 19SL738R has no image, there is sound and the channels are switched, there is a possibility of a malfunction in the backlight LED circuit of the LC185EXN-SCA1 panel, or their power converter - LED driver. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the LED driver itself, including in the secondary rectifier of the main PSU.
To check the health of the LEDs and contact connections in their power circuit, the panel must be disassembled.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
Matrix LC185EXN (SC)(A1)---------------> LG Panel specification LC185EXN (SC)(A1)
The appearance of the MainBoard 715G4372 is shown in the figure below:715G4372
Main features of the TOSHIBA 19SL738R device:
Installed matrix (LED-panel) LC185EXN-SCA1.
The formation of the necessary supply voltages for all nodes of the TOSHIBA 19SL738R TV is carried out by the power supply module 75022447, or its analogues.
MainBoard - the main board (motherboard) is a 715G4372 module.
The ENV57S0108R tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC185EXN-SCA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare (Haze 13%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Dithering), CIE1931 68%
Response Time: 9 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
Trademark: TOSHIBA, Model: 19SL738.
Briefly from the TV: LCD, LED backlight, 19 ", 1366x768, 720p HD, sound: 6W, HDMI connectors: 2.
The official Toshiba website has firmware (software update) for the 19SL738R (2.04), 19SL738N (2.04), 19SL738G (2.04), 19SL738F (2.04) models.
The composition includes MainBoard M01-000-005B 715G4372 and LCD panel (matrix) LC185EXN-SCA1.
Power Supply Unit (PSU) 715G4263 75022447 Power Supply.
TOSHIBA 19SL738 LED TV with LC185EXN-SCA1 LCD, 19 "(48 cm) diagonal, 16: 9 format. The required screen brightness of 300 cd / m² is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 1000 : 1. Dynamic contrast ratio of 1,000,000: 1 is achieved by special control of the LEDs. This model uses side LED backlighting from Edge LEDs. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). Input height ochastotny or video signal can be processed by analog systems, PAL, SECAM, NTSC Image processing and generation of the digital signal occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p Supported multimedia file formats:.. MP3, JPEG.
The power of the acoustic system of sound 6 W (2x3 W) provide two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, SCART x2, RGB, VGA, HDMI x2, USB. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C standards.
The power consumed by the TV in the operating mode from the network is 29 watts.
Overall dimensions: with stand 470x343x188 mm, without stand 470x304x35 mm.
TV Weight: with stand: 4 kg, without stand: 2.8 kg.
Attention! The LC185EXN-SCA1 panel of the TOSHIBA 19SL738 LED TV is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.