Technical description and composition of the TOSHIBA 19W301PR TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 19W301PR
Chassis / Version: 17MB24H-3 Vestel
Panel: SVA190WX02TB / V30058335
Inverter (backlight): ROHS-384096 vestel 17IPS02-2
PWM Inverter: FAN7314 (20N)
Power Supply (PSU): 17IPS02-2 vestel
PWM Power: FDS8962C (SOP-8), STR-W6253
MOSFET Power: Y2010 diod.
MainBoard: 17MB24H-3 374397
IC MainBoard: VCT 49X3G PZ F1 000 - percent MST517A-M-LF- Scaler TEA6422
Tuner: UV1316 / A I H-4
Control: CT-865
Specifications 19W301PR
TOSHIBA 19W301PR
General recommendations for repairing TV LCD
Repair of the TOSHIBA 19W301PR TV is better to start with a thorough external inspection and troubleshooting. It is advisable to carefully examine the internal and external components. Often, according to 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. 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.
Sometimes the TOSHIBA 19W301PR 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 17IPS02-2 vestel common power module. The diagnostics of the power supply should always be started by checking the fuse and, if it breaks, you must first check the rectifier bridge diodes and the power switch Y2010 diod. the probability of an avalanche or thermal breakdown.
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 chip of the PWM controller KIA78R12P1 pl FDS8962С (8н) pl STRW6253 may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
Diagnostics of power modules with a Power Factor Corrector (CMC) is somewhat more complicated and requires a more detailed approach.
In cases where the TOSHIBA 19W301PR TV has lost its image, and the sound is there and all other functions are operational, there is a possibility of an inverter (converter for powering the backlight) malfunction. When you turn on the TV, the image may appear briefly and immediately disappear. It must be borne in mind that with such manifestations, the lamps themselves also fail, the malfunction of which can be detected by replacement, by connecting to the connectors for diagnostics that are known to be serviceable and suitable in power.
Repair of the ROHS-384096 inverter vestel 17IPS02-2 inverter is difficult because in case of any malfunction or emergency, even if the lamps are unevenly worn, protection is triggered, which turns it off for fire safety. Diagnostics become impossible and protection needs to be disabled.
In such cases, special care should be taken during diagnostics, and after completion of all repair work, it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
In cases of attempts to repair the motherboard MB24H-3 374397, it is necessary to check the operability of the power stabilizers of the microcircuits and, if possible, update the software (software). In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its VCT 49X3G PZ F1 000 chips - percent MST517A-M-LF-Scaler TEA6422 and other possible faulty components.
The malfunction of the UV1316 / A I H-4 tuner is established after checking the software and all the supply voltages at its terminals, including the varicap supply voltage (30-33V).
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 19W331DG - Vestel 17MB24H
The appearance of the MainBoard 17MB24H-3 is shown in the figure below:
17MB24H-3
Main features of the TOSHIBA 19W301PR device:
Installed matrix (LCD panel) SVA190WX02TB / V30058335.
To power the backlight, an ROHS-384096 inverter is used, it is controlled by the FAN7314 PWM controller (20n).
The necessary supply voltages for all nodes of the TOSHIBA 19W301PR TV are generated by the 17IPS02-2 power module or its analogs using FDS8962C (SOP-8), STR-W6253 microcircuits and power switches of the Y2010 diod .. type.
MainBoard - the main board (motherboard) is a 17MB24H-3 module, using VCT 49X3G PZ F1 000 microcircuits - percent MST517A-M-LF- Scaler TEA6422 and others.
The UV1316 / A I H-4 tuner allows you to receive television programs and tune to channels.
Additional technical information about the panel:
Brand: SVA-NEC
Model: SVA190WX02TB
Type: a-Si TFT-LCD, Panel
Diagonal size: 19.0 inch
Resolution: 1440x900, WXGA +
Display Mode: TN, Normally White, Transmissive
Active Area: 408.24x255.15 mm
Brightness: 300 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.3 / 3.7 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V
Trademark: TOSHIBA, Model: 19W301PR.
Short from TV: LCD, 19 ", 1440x900, 720p HD, sound: 6 watts.
The composition uses MainBoard 17MB24H-3 374397 and an LCD panel (matrix) SVA190WX02TB5.
Power Supply Unit (PSU) 17IPS02-2 Vestel Power Supply.
TOSHIBA 19W301PR LCD TV with SVA190WX02TB5 LCD, 19 "(48 cm) diagonal 16:10 format. Screen brightness of 300 cd / m² is provided by CCFL (EEFL) fluorescent lamps. The ratio of maximum brightness to minimum (contrast) is 1000: 1. It is possible to view images in high quality HD with a resolution of 1440x900 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation takes place in ndartah 480i, 480p, 576i, 576p, 720p, 1080i.
The power of the sound system 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 x2, S-Video, component, SCART, RGB, VGA, HDMI. 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 65 watts.
Overall dimensions: with stand 480x397x175 mm, without stand 480x352x80 mm.
TV Weight: with stand: 5.8 kg, without stand: 5.3 kg.
Attention! The TOSHIBA 19W301PR LCD TV panel SVA190WX02TB5 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!