Technical description and composition of the TOSHIBA 19AV704R TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 19AV704R
Chassis / Version: MST3740EU-T MAIN BD manufactured by UNIHAN
Panel: M185B1-L03 RevC2
Inverter (backlight): integrated into PSU
PWM Inverter: MP1008ES (16)
MOSFET Inverter: P5506HVG (8)
Trans Inverter: SPI 8TC00487
Power Supply (PSU): 3BS0240213GP Rev1 FSP024-2L03A
PWM Power: 1230D6 (8pin)
MOSFET Power: P10NK80ZFP
MainBoard: MST1922EU-T Rev1.03
IC MainBoard: MST9A884JL, TPA6132A2RTER TAS5707L MP2359DJ
Tuner: TT2124
Control: CT-90326
Specifications 19AV704
TOSHIBA 19AV704R
General recommendations for repairing TV LCD
It is advisable to start any repair and diagnostics of the TOSHIBA 19AV704R TV with a careful external examination of the internal and external elements, including case parts, display, buttons and cables. Often, for certain external signs, the repairman can draw some 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. In most cases, the repairman can guess the causes of the defect and possible consequences by the characteristic signs of typical TV defects, for example, ring cracks formed in the soldering of element leads, swollen rectifier filter capacitors, charred resistors and other circuit elements.
If the power supply module 3BS0240213GP Rev1 FSP024-2L03A malfunctions, the external manifestations may be different, for example, the TOSHIBA 19AV704R does not turn on at all and there is no indication of the indicator lights on the front panel. In this case, first of all, it is necessary to check the fuse at the input of the network. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the N-FET converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. P10NK80ZFP options are available.
It should be remembered that in the practice of repair, usually the power keys of N-Fet converters 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 230D6 PWM controller chip itself may be faulty (8). It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
If the power module uses an active KKM circuit (power factor control), troubleshooting is somewhat more complicated.
Sometimes the TOSHIBA 19AV704R TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the backlight converter, or of the lamps themselves, which can be checked by replacement. In such cases, it is necessary to verify the serviceability of all electrolytic capacitors of the filter according to the power supply of the inverter itself, including in the power supply unit (power supply unit).
Repair of the inverter 3BS0240213GP Rev1 FSP024-2L03A is complicated by the fact that in case of any malfunction or emergency, even if the lamps are unevenly worn, a protection is triggered, which turns it off for fire safety. Diagnostics become impossible and protection needs to be disabled.
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.
Repair or diagnostics of the MST1922EU-T Rev1.03 motherboard should be started by checking the power conditioners. If necessary, you should update the software (software).
Attention to users! Independent repair of the TOSHIBA 19AV704R TV without the appropriate qualifications and experience can lead to its complete non-repairability!
FIRMWARE FOR SPI FLASH -----------> TOSHIBA 19AV703R, 19AV704R. Main MST1922EU-T REV 1.03
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 32AV703R ((19AV703R/704, 22AV703R/704)
1. Service Manual 51 pages on models 19AV703R, 22AV703R, 26AV703R, 32AV703R, 32LV703R, 37LV703R, 40LV703R, 19AV704R, 22AV704R, 26AV704R, 32AV704R, 32LV704R, 37LV704R, 40LV704R
2. Service Manuals with Schematic Diagrams 44 pages on the 19AV704R
The appearance of the MainBoard MST1922EU-T is shown in the figure below:MST1922EU-T
MST1922EU-T can be used in TVs:
TOSHIBA 19AV703R (Panel M185B1-L03 Rev C2 75016448 (5v)), TOSHIBA 19AV704R (Panel M185B1-L03 RevC2), TOSHIBA 22AV703R (Panel V216B1-L02 75016438).
Main features of the TOSHIBA 19AV704R device:
Installed matrix (LCD panel) M185B1-L03 RevC2.
To power the backlight, a converter is used, combined with a power supply unit, controlled by the MP1008ES PWM controller (16). The transformer SPI 8TC00487 is installed in the inverter converter. As power elements of the inverter, keys of the type P5506HVG (8) are used.
The necessary supply voltages for all nodes of the TOSHIBA 19AV704R TV are generated by the power supply module 3BS0240213GP, or its analogs using 1230D6 microcircuits (8pin) and power switches of the P10NK80ZFP type.
MainBoard - the main board (motherboard) is a module MST1922EU-T, using microcircuits MST9A884JL, TPA6132A2RTER TAS5707L MP2359DJ and others.
The TT2124 tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CMO
Model: M185B1-L03
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.3 / 3.7 (Tr / Td)
Frequency: 60Hz
Lamp Type: 2 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
TOSHIBA 19AV704 LCD TV with M185B1-L03 LCD display, 19 "(48 cm) diagonal size in 16: 9 format. 300 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. Ratio of maximum brightness to minimum (contrast) ) is 1000: 1. Dynamic contrast ratio of 10000: 1 is achieved by special control of the backlight. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in an analog system . PAL, SECAM, NTSC Image processing and the formation of the digital signal is in 480i standards, 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. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x3, component, SCART, 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.
The power consumed by the TV in the operating mode from the network is 40 watts.
Overall dimensions: 480x358x188 mm.
TV Weight: 5.5 kg.
Attention! The TOSHIBA 19AV704 LCD TV panel M185B1-L03 RevC2 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!