Technical description and composition of the TOSHIBA 32LV703R TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 32LV703R A
Chassis / Version: MST3740EU-T MAIN BD manufactured by UNIHAN
Panel: T315HW04 V.4 (12v) 75018019
T-CON: T315HW04 V0 19.31T09.003 31T09-COG AUO-12401
Inverter (backlight): 1414-049W000 75021073 19.31T09.003 VIT71884.00 Rev2
PWM Inverter: OZ964SN
MOSFET Inverter: P4004ED (3), P2904BD (3)
Power Supply (PSU): FSP132-3F01 75018688 POWER MODULE, OPENFRAME 132W / + 5,12,24V, 0433-002F000
PWM Power: SSC9502S, NCP1607B (PFC), STR-A6069H
MOSFET Power: FQPF5N50C, 2SK4110
MainBoard: MST3740EU-T BD REV: 1.04 (sticker 32LV703G / R V1.03 P2) 69EB3JM10C06P 75018765
IC MainBoard: MST9B884JL-LF-3, MX 25L1605DM2I, W9412G6IH-4,
Tuner: TT2124
Toshiba
Model: 32LV703R K
Chassis / Version: MST3740EU-T MAIN BD manufactured by UNIHAN
Panel: LTA320HA04 T01 75016399 (12v)
T-CON: LJ94-03143A 75017291
Inverter (backlight): LJ97-02154 75015806
MainBoard: MST3740EU-T 69EB3JM10C06P 75018765
IC MainBoard: MST9A884JL-LF, W9412G61H-4
Tuner: TT2124
Control: IR: 08E1-06R2200
Specifications 32LV703
TOSHIBA 32LV703R
General recommendations for repairing TV LCD
Repair of the TOSHIBA 32LV703R K is better to start with a thorough external inspection and diagnosis of the malfunction. It is advisable to carefully examine the internal and external components. In some cases, visible external damage to the elements can suggest directions for troubleshooting and localizing the defect before starting the necessary measurements at the control points of the nodes of electronic circuits. 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.
In the absence of any signs of operability, when the TOSHIBA 32LV703R K does not turn on and does not signal anything with the control lights on the panel, the power module is most likely faulty. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and, in the event of an open circuit, the reason should be sought in the power semiconductor elements of the pulsed flyback converter of the main PSU. First of all, it is necessary to check the diodes of the bridge of the rectifier of the mains voltage and the power switch of the converter, which can be installed separately on the radiator, or integrated with a PWM controller.
The reasons for the breakdown of the power switch of the flyback converter of the power module can be different, for example, a malfunction of semiconductor elements or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM controller chip or breakage of the resistors in its bundle.
If an active Power Factor Corrector (PFC) is used in the power module circuitry, it is sometimes more difficult to troubleshoot. Knowledge, experience, intuition and skills in such cases have a great advantage for a successful repair.
If the TOSHIBA 32LV703R K does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction of the display backlight, or their power converter - inverter. 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 inverter itself, including in the secondary rectifier of the main PSU.
In most cases, the diagnosis and repair of the LJ97-02154 75015806 inverter is difficult due to the organization of protection, which turns it off in emergency cases to avoid fires during short circuits or breaks in high-voltage circuits and when the lamps are depressurized. Often, repairmen block the protection circuits in order to make the necessary measurements at the inverter control points to identify the causes of the defect.
In these cases, special care must be taken in view of the risk of failure of the power elements. After completing all repair work, it is imperative to restore the protection circuits for full and safe further operation of the TV by the user.
On the 69EB3JM10C06P 75018765 motherboard, in case of a malfunction, you should first check the operation of all power supply stabilizers in the circuits and, if necessary, update the software (software).
For owners of the 32LV703R K TV, we recommend that you contact qualified personnel with experience to repair! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 32LV703R
Service Manual 51 pages on models 19AV703R, 22AV703R, 26AV703R, 32AV703R, 32LV703R, 37LV703R, 40LV703R,19AV704R, 22AV704R, 26AV704R, 32AV704R, 32LV704R, 37LV704R, 40LV704R
The appearance of the MainBoard MST3740EU-T is shown in the figure below:MST3740EU-T
MST3740EU-T can be used in TVs:
TOSHIBA 26AV703R (Panel V260B3-L04 RevC1), TOSHIBA 32AV703R C (Panel V315B5-L12 75018968), TOSHIBA 32AV703R K (Panel LTA320AP08 75016146 ), TOSHIBA 32AV704R (Panel V315B5-L12 Rev01 75018968), TOSHIBA 32LV703R A (Panel T315HW04 V.4 (12v) 75018019), TOSHIBA 32LV703R K (Panel LTA320HA04 T01 75016399 (12v)), TOSHIBA 40LV703R C (Panel V400H1-L10 REV C1 75018974), TOSHIBA 40LV703R K (Panel LTA400HM02 T03).
Main features of the TOSHIBA 32LV703R device:
Installed matrix (LCD panel) LTA320HA04 T01 75016399 (12v).
The matrix control uses the Timing Controller (T-CON) LJ94-03143A.
To power the backlight used inverter LJ97-02154.
The required supply voltage for all nodes of the TOSHIBA 32LV703R TV provides a switching power supply.
MainBoard - the main board (motherboard) is an MST3740EU-T module, using microchips MST9A884JL-LF, W9412G61H-4 and others.
The TT2124 tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA320HA04
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 698.4x392.85 mm
Surface: Antiglare (Haze 7%), Hard coating (3H)
Brightness: 420 cd / m²
Contrast Ratio: 3600: 1
Display Colors: 1.07B (8-bit + Hi-FRC), CIE1931 72%
Response Time: 16/9 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (2 ch, 10-bit), 51 pins
Voltage: 12.0V
TOSHIBA 32LV703 LCD TV with LTA320HA04 LCD display, 32 "(81 cm) diagonal size in 16: 9 format. 450 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. The ratio of maximum brightness to minimum (contrast) is 3000: 1. Dynamic contrast ratio of 30000: 1 is achieved by special control of the backlight operation.The design and technical capabilities of the TV provide for viewing broadcasts and films in high quality HD at a resolution of 1920x1080 pixels in a graphic resolution according to the standard 1080p (Full HD). the signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, JPEG.
The power of the sound system 20 W (2x10 W) provides 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, audio x3, 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.
The power consumed by the TV in the operating mode from the network is 115 watts.
Overall dimensions: with stand 799x578x271 mm, without stand 799x524x95 mm.
TV Weight: with stand: 12.5 kg, without stand: 10.7 kg.
Attention! The TOSHIBA 32LV703 LCD TV panel LTA320HA04 T01 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!