Technical description and composition of the TOSHIBA 26SL738R TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 26SL738R
Panel: LC260EXN-SCA1
T-CON: 6870S-0955A built-in
LED driver (backlight): 715G4293-P01-H20-001U
Power Supply (PSU): 715G4293-P01-H20-001U
PWM Power: A6069H (8), LD7523GS (8)
MainBoard: 715G4357 - M01-000-005X
Tuner: ENV57S01D8RF
Specifications 26SL738
TOSHIBA 26SL738R
General repair guidelines for TV LCD LED
Repair and diagnostics of any electronic device, in particular the TOSHIBA 26SL738R, it is advisable to start with a careful external examination of internal and external elements. Visible damage to elements can sometimes indicate the direction of the search for a defect even before the necessary measurements are taken. Ring cracks in the soldering of the leads of the heating elements, swollen electrolytic capacitors, a charred paint layer on the resistors - all this for the repairman can be a significant clue in the assumptions about the causes and consequences of the malfunction.
Faults in the 715G4293-P01-H20-001U power module can be expressed in different ways, for example, the TOSHIBA 26SL738R does not turn on at all and the control lights on its front panel do not light up and do not blink, and there are no signs of operability. It should be noted that with the same external manifestations, the processor power regulator (converter) may be faulty. It is advisable to start the troubleshooting of the power supply module by checking the state of the electrolytic capacitors of the rectifier filters and the mains fuse. Defective capacitors should be replaced. If the mains fuse is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and transistors, which are often found in such a state of breakdown.
Power switches in pulsed power supplies (SMPS) fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The reason may be a malfunction of the PWM controller chip A6069H (8), LD7523GS (8), which can only be checked by replacing it with a new or obviously working one.
If the TOSHIBA 26SL738R does not have an image, but there is sound and the TV is controlled by the remote control, a malfunction in the backlight circuits of the LC260EXN-SCA1 panel is likely. The LEDs or the power converter - LED driver may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the LED driver, and check the LEDs, connecting obviously known good diagnostics.
Often there is a need for disassembling the panel to check the health of the LEDs, as well as contact connections in the connectors and soldering.
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.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software).
In the absence of tuning to the local television channels, you should make sure that the voltage of the varicaps (30-33V) and other supply voltages on the terminals of the tuner ENV57S01 ...
Remember! Attempts to self-repair by users of the TOSHIBA 26SL738R TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 26/32/42SL738G
Service Manuals with Schematic Diagrams 70 pages 2011 on models 26SL738G, 26SL738B, 22SL700A, 26SL700A, 26SL400A, 26AV615DB, 32SL738B
The appearance of the MainBoard 715G4357 is shown in the figure below:715G4357
715G4357 can be used in TVs:
TOSHIBA 26SL738R (Panel LC260EXN-SCA1), TOSHIBA 32SL738R (Panel LC320EXN (SC)(A2) LED), TOSHIBA 42SL738R (Panel LC420EUD (SC)(A2)).
Main features of the TOSHIBA 26SL738R device:
Installed matrix (LED-panel) LC260EXN-SCA1.
The matrix control uses the Timing Controller (T-CON) 6870S-0955A.
The LED driver 715G4293-P01-H20-001U is used to power the backlight LEDs.
The necessary supply voltages for all nodes of the TOSHIBA 26SL738R TV are generated by the power supply module 715G4293-P01-H20-001U, or its analogs using microchips A6069H (8), LD7523GS (8).
MainBoard - the main board (motherboard) is a 715G4357 module.
The ENV57S01D8RF tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC260EXN-SCA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 400 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit)
Response Time: 8.0 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
Trademark: TOSHIBA, Model: 26SL738.
Briefly from the TV: LCD, LED backlight, 26 ", 1366x768, 720p HD, sound: 10W, HDMI connectors: 3.
The Toshiba official website has firmware (software update) for the 26SL738R (2.04), 26SL738N (2.04), 26SL738G (2.04), 26SL738F (2.04) models.
The composition uses MainBoard 715G4357-M01-000-005X and an LCD panel (matrix) LC260EXN-SCA1.
Power Supply Unit (PSU) 715G4293-P01-H20-001U Power Supply.
TOSHIBA 26SL738 LED TV with LC260EXN-SCA1 LCD, 26 "(66 cm) diagonal size 16: 9 format. The required screen brightness of 400 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 operation.This model uses side illumination 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). 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 sound system 10 W (2x5 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 x3, 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 43 watts.
Overall dimensions: with stand 645x443x205 mm, without stand 645x404x36 mm.
TV Weight: with stand: 6.9 kg, without stand: 5.58 kg.
Attention! The LC260EXN-SCA1 panel of the TOSHIBA 26SL738 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