Technical description and composition of the TOSHIBA 19DV703R TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 19DV703R
Chassis / Version: GRU2 WISTRON 19DV704R
Panel: M185XW01 V2
Inverter (backlight): FSP050-2PI06A 75019676
PWM Inverter: OZ9938GN (16)
MOSFET Inverter: P2806HV (8)
Trans Inverter: SPI 8TC00506
Power Supply (PSU): FSP050-2PI06A 75019676
PWM Power: 6742MR (8)
MOSFET Power: 7N65
MainBoard: GRU2 15 19 22 75019667 PC BOARD ASSY
IC MainBoard: 75019668 DVD-RW DRIVE UNIT, HH SLOT, DAV-RR953WR, RUSS, SOH-DL6 (SAMSUNG IM)
Tuner: TDTC-G429D
Control: SE-R0319
Specifications 19DV703
TOSHIBA 19DV703R
General recommendations for repairing TV LCD
Repair of the TOSHIBA 19DV703R, 19DV704R must begin with the diagnosis of the malfunction and a thorough inspection of its external and internal components, including the case ones. Visible damage to elements can sometimes suggest further directions for finding a defect before starting the necessary measurements. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
If the power supply module FSP050-2PI06A 75019676 malfunctions, the external manifestations may be different, for example, the TOSHIBA 19DV703R, 19DV704R does not turn on at all and there is no indication of the indicator lights on the front panel. When diagnosing and repairing the power supply FSP050-2PI06A 75019676, the fuse must first be checked, and if it is broken, the power switch 7N65 and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
As a rule, the keys of flyback converters, which use an N-Fet field effect transistor on a separate radiator, or integrated with a 6742MR PWM controller (8) in a single chip, are reliable enough and rarely fail for no reason. The reasons for the breakdown of the key should be sought by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
If the power module uses an active KKM circuit (power factor control), troubleshooting is somewhat more complicated.
If the TOSHIBA 19DV703R, 19DV704R TV does not have an image, but there is sound, the malfunction should be sought in the power converter of the backlight (inverter). It is also necessary to check the serviceability of the electrolytic capacitors of the filter of the secondary rectifiers of the PSU (power supply) for an overstated ESR.
Often, attempts to repair the inverter FSP050-2PI06A 75019676 are hampered by the fact that the diagnosis of the malfunction is complicated by the operation of its protection, which is designed to turn off the inverter in emergency conditions - when the lamps are depressurized, breaks or short circuits in high voltage connections and other emergency situations. Lock protection to localize the defect is popular among repairmen.
Turning off the protection for diagnostic purposes, it must be remembered that in this case there is a risk of failure of the inverter power elements. Upon completion of the diagnosis, all regular protection circuits should be restored.
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). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - 75019668 DVD-RW DRIVE UNIT, HH SLOT, DAV-RR953WR, RUSS, SOH-DL6 (SAMSUNG IM) and replace the failed chips with new ones.
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 TDTC-G429D, which is usually within 30-33V, as well as other supply voltages at the terminals of the tuner.
We recommend the owners of the 19DV703R, 19DV704R TV for repair only to qualified specialists with experience! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 15DV703R, Toshiba 19DV703R, Toshiba 19DV704R, Toshiba 22DV703R, Toshiba 22DV704R, Toshiba 26DV703R, Toshiba 32DV703R
The appearance of MainBoard GRU2 is shown in the figure below:GRU2
GRU2 can be used in TVs:
TOSHIBA 15DV703R 15DV704R (Panel M156B1-L02 RevC1 79104859), TOSHIBA 15SLDT3R (Panel M156B1-L02 Rev.C1), TOSHIBA 19DV703R (Panel M185XW01 V2), TOSHIBA 22DV703R (Panel V216B1-L04 Rev C1 (L02 Rev C1)), TOSHIBA 22DV704R (Panel V216B1-L04 79105088), TOSHIBA 32DV703R 32DV704R (Panel T315XW04 V.1 79105169 ).
Main features of the TOSHIBA 19DV703R device:
Installed matrix (LCD panel) M185XW01 V2.
To power the backlight, an inverter FSP050-2PI06A is used, it is controlled by the PWM controller OZ9938GN (16). The transformer SPI 8TC00506 is installed in the inverter converter. As power elements of the inverter, keys of the type P2806HV (8) are used.
The necessary supply voltages for all nodes of the TOSHIBA 19DV703R TV are generated by the FSP050-2PI06A power supply module or its analogs using 6742MR microcircuits (8) and 7N65 type power switches.
MainBoard - the main board (motherboard) is a GRU2 module, using chips 75019668 DVD-RW DRIVE UNIT, HH SLOT, DAV-RR953WR, RUSS, SOH-DL6 (SAMSUNG IM) and others.
The TDTC-G429D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: M185XW01 V2
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, Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 3.6 / 1.4 (Tr / Td)
Frequency: 60Hz
Lamp Type: 2 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
TOSHIBA 19DV703 LCD TV with M185XW01 LCD display, 19 "(48 cm) diagonal size in 16: 9 format. 300 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. The ratio of maximum brightness to minimum (contrast) is 1000: 1 Dynamic contrast ratio of 5000: 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 analog P systems AL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i. Supported media file formats: MP3, WMA, MPEG4, VideoCD, SVCD, 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, audio x2, component, 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, 1360x768.
The power consumed by the TV in the operating mode from the network is 34 watts.
Overall dimensions: 481x366x215 mm.
The mass of the TV: 5.3 kg.
Attention! The M185XW01 V2 panel of the TOSHIBA 19DV703 LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!