Technical description and composition of the TOSHIBA 26EL933RB TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 26EL933RB
Chassis / Version: 32AV933
Panel: LC260EXN-SDA3 75023140
LED driver (backlight): on the bar
Power Supply (PSU): PE-3630-01UN-LF (possible analogs from DELTA) 75030546 PC BOARD ASSY, POWER, 0433-006U000
PWM Power: A6069H (7)
MainBoard: 32AV933 75030576 PC BOARD ASSY MAIN, 9C-EB40M00Z0
IC MainBoard: CPU: MSD3704PX-LF-VW; SPI Flash: 25Q64
Tuner: TDTK-G541D (U) or TDTK-G641D (U)
Specifications 26EL933
TOSHIBA 26EL933RB
General repair guidelines for TV LCD LED
It is advisable to start repairing the TOSHIBA 26EL933RB TV with a careful external examination of both internal and external elements. Often, based on certain external signs, it may be possible to draw certain conclusions about the reasons for the failure of certain elements of the circuit even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. Experienced repairmen are often aware of the causes of the defect and possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
Sometimes the TOSHIBA 26EL933RB TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the common PE-3630-01UN-LF power supply module (DELTA analogs are possible) 75030546 PC BOARD ASSY, POWER, 0433-006U000. If it is working properly, you need to check the processor batteries on the SSB (Main Board). In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should be started by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors in switching power supplies (SMPS) fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, or dried electrolytic capacitors or dangling primary resistors BP circuits involved in the stabilization process. In this case, all semiconductor elements of the strapping of the A6069H PWM controller microcircuit (7) are subject to verification, which it is desirable to verify by replacement.
If, when you turn on the TV, the image appears and immediately disappears, or is missing initially when you turn on, but the sound has other functions that work, there is a high probability of a malfunction of the LED driver (LC260EXN-SDA3 75023140 panel LED backlight power converter). In such cases, the general power module is also subject to verification, in which the electrolytic capacitors of the rectifier filter supplying the LED driver should be checked.
To check the health of the LEDs and contact connections in their power circuit, the panel must be disassembled.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is 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).
Typical 32AV933 motherboard defect:
The TV does not enter the operating mode, the red indicator on the panel lights up, DO NOT POWER OFF SCAN appears and the scan scale is turned upside down. Scanning from 0 to 100% takes place, then it starts again from 0% and everything repeats in a circle.
Replacing software from the official site via USB does not help. Replacement and flashing of SPI FLASH 25Q64 is required.
The firmware option from the remont-aud-net website for the LC260EXN (SD) (A3) panel is included.
Winbond's SPI FLASH chip must be replaced with a new one.
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the voltage of the varicaps of the tuner TDTK-G541D (U) or TDTK-G641D (U), which is usually in the range 30-33V, as well as others supply voltage at the terminals of the tuner.
Remember! Attempts to self-repair by users of the TOSHIBA 26EL933RB TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 26EL933G
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba MAIN 32AV933
FIRMWARE FOR SPI FLASH -----------> TOSHIBA 26EL933RB, Main: 32AV933, Panel: LC260EXN
Service Manuals with Schematic Diagrams 53 pages 2011 on models ------------------> 19EL933RB, 19EL934RB, 23EL933RK, 23EL934RK, 26EL933B, 26EL933G, 26EL933RB, 26EL934G, 32EL933B, 32EL933G, 32EL933N, 32EL933RB, 32EL934G, 32EL934RB, 32HL933B, 32HL933G, 32HL933N, 32HL933RK, 40HL933B, 40HL933G, 40HL933N, 40HL933RK, 32AV933G, 32AV933N, 32AV933RB, 32AV934G, 32AV934RB, 32LV933G, 32LV933N, 32LV933RB, 40LV933G, 40LV933N, 40LV933RB.
The appearance of the MainBoard 32AV933 is shown in the figure below:32AV933
32AV933 can be used in TVs:
TOSHIBA 19EL934RB 19EL933RB (Panel LC185EXE-TEA1), TOSHIBA 23EL934RK 23EL933RK (Panel LTM230HT10), TOSHIBA 26EL933RB (Panel LC260EXN-SDA3 75023140), TOSHIBA 32AV933RB 32AV934RB (Panel LC320WXN-SCC1 ), TOSHIBA 32EL933RB (Panel LC320EXN SE A1 75030579 LCD PANEL LC320EXN-SEA1), TOSHIBA 32EL934RB (Panel LC320EXN SE A1), TOSHIBA 32HL933RK (Panel LTA320HN03 T03), TOSHIBA 32LV933RB (Panel T315HW04 V.4 (REV.6)), TOSHIBA 40HL933RK (Panel LTA400HM22 T01), TOSHIBA 40LV933RB (Panel LTA400HM01 ), TOSHIBA 32L2454RB 32L2453RB (Panel LC320EUJ (FF)(E2)).
Main features of the TOSHIBA 26EL933RB device:
Installed matrix (LED panel) LC260EXN-SDA3 75023140.
The LED driver on is used to power the backlight LEDs.
The necessary supply voltages for all nodes of the TOSHIBA 26EL933RB TV are generated by the PE-3630-01UN-LF power module or its analogs using A6069H microcircuits (7).
MainBoard - the main board (motherboard) is a 32AV933 module using CPU chips: MSD3704PX-LF-VW; SPI Flash: 25Q64 and others.
The tuner TDTK-G541D (U) or TDTK-G641D (U) provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC260EXN-SDA3
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: 350 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 68%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V