Technical description and composition of the TOSHIBA 19AV703R TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 19AV703R
Chassis / Version: MST3740EU-T MAIN BD manufactured by UNIHAN
Panel: M185B1-L03 Rev C2 75016448 (5v)
Inverter (backlight): FSP050-2PI06A 75019676
PWM Inverter: OZ9938GN
Power Supply (PSU): DPS-53CP A 75018736 POWER MODULE, OPEN FRAME 42W 5V 12V, 0433-0037000
PWM Power: DDA010 (Standby), 6742MR (8)
MainBoard: MST1922EU-T Rev1.03 75018735 69EB3IM11C04P
IC MainBoard: MST9A884JL-LF, TPA6132A2RTER TAS5707L MP2359DJ
Tuner: TT2124
Specifications 19AV703
TOSHIBA 19AV703R
General recommendations for repairing TV LCD
It is advisable to start the diagnosis of a malfunction of the TOSHIBA 19AV703R TV, like all others, with an external examination of possible changes, both external and internal elements. Often, by the external signs and nature of some damage, it is possible to draw preliminary conclusions and determine a further algorithm for troubleshooting. 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 hint in the assumptions about the causes and consequences of the malfunction.
In cases when the TOSHIBA 19AV703R TV does not turn on, does not respond to the remote control and buttons, no indicators on the front panel light up or blink, and there are no sounds and no signs of operability when turning on, the power supply module DPS-53CP A 75018736 is most likely to be faulty POWER MODULE, OPEN FRAME 42W 5V 12V, 0433-0037000 or, which is much less common, there is no processor power on the motherboard. When diagnosing and repairing the DPS-53CP A 75018736 POWER MODULE, OPEN FRAME 42W 5V 12V, 0433-0037000 power supply unit, the fuse must first be checked, and if it is broken, the power switch and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
As a rule, the keys of flyback converters, which use the N-Fet field effect transistor on a separate radiator, or integrated with the ICE DDA010, 6742MR (8) PWM controller in a single chip, are quite reliable 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.
Diagnostics of power modules with a Power Factor Corrector (CMC) is somewhat more complicated and requires a more detailed approach.
If the TOSHIBA 19AV703R has no image, but there is sound, there is a possibility of a malfunction of the backlight or power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working.
When repairing the inverter FSP050-2PI06A 75019676, it is often necessary to disable the protection for diagnostics, which, for the purpose of fire safety, turns it off in any emergency situation, for example, during a malfunction or uneven wear of the lamps, which makes it difficult to find a 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.
Repair or diagnostics of the MST1922EU-T Rev1.03 75018735 69EB3IM11C04P motherboard must be started by checking the power conditioners. If necessary, you should update the software (software).
In cases where there is no tuning to the local television channels, make sure that the voltage of the varicaps (30-33V) and other supply voltages on the terminals of the tuner TT2124 are present.
Once again, remind users! Attempts to independently repair the TOSHIBA 19AV703R TV without the appropriate qualifications and experience can lead to its complete non-repairability!
FIRMWARE FOR SPI FLASH -----------> TOSHIBA 19AV703R. Main MST1922EU-T REV 1.03
FIRMWARE FOR SPI FLASH -----------> TOSHIBA 19AV703R, 26AV703R, 32AV703R. Main MST3740EU-T-MAIN BD REV1.04
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 32AV703R ((19AV703R, 22AV703R)
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 73 pages on models 19AV703, 22AV703, 26AV703, 32AV703, 19AV703R, 22AV703R, 26AV703R, 32AV703R, 19AV703G, 22AV703G, 26AV703G, 32AV703G.
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 19AV703R device:
Installed matrix (LCD panel) M185B1-L03 Rev C2 75016448 (5v).
To power the backlight, an inverter FSP050-2PI06A is used, it is controlled by the PWM controller OZ9938GN.
The necessary supply voltages for all nodes of the TOSHIBA 19AV703R TV are generated by the DPS-53CP power module or its analogs using DDA010 (Standby), 6742MR microcircuits (8).
MainBoard - the main board (motherboard) is an MST1922EU-T module, using microchips MST9A884JL-LF, TPA6132A2RTER TAS5707L MP2359DJ and others.
The TT2124 tuner provides TV reception and channel tuning.
Information from an alternative source:
TOSHIBA 19AV703R
Panel Type (Matrix): M185B1-L03,
Motherboard: MST1922EU-T REV: 1.03, MST9A884JL-LF, 25Q18BVSIG / 1009, 24C32WP, TAS5707, Tuner: TT2124 21935620 SV20 10281297217
PSU: FSP042-2L03C 3BS0240213GP REV: 1
Remote control: CT-90326, Factory Menu
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