Toshiba
Model: 19HV10E
Panel: LTA185AT01
Inverter (backlight): integrated into PSU; 74.8V 126mA
MOSFET Inverter: 9997GH
Power Supply (PSU): V71A00023600
PWM Power: 3BR0665JZ (Standby)
MainBoard: V28A001322A1 PE1006
IC MainBoard: RTD2668 B7H49S1, 25Q80
Tuner: DTOS40CVL051A
Control: CT-90325
Specifications 19HV10
TOSHIBA 19HV10E
General recommendations for repairing TV LCD
Possible manifestations of defects
- The TOSHIBA 19HV10E TV does not turn on and does not show any signs of operability at all. There is no reaction to either the remote control or the front panel control buttons.
Most likely in this case, the main switching power supply (IIP) V71A00023600 is faulty. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary first of all to check the power switches and rectifier diodes for a possible partial or complete breakdown.
In the event of a breakdown in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the main fuse or current sensor at the source of the key most often breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke the excess of maximum current or voltage values. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the V28A001322A1 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). If it is not possible to replace the MB board (SSB), you need to check the health of its elements - RTD2668 B7H49S1, 25Q80. Defective components should be replaced.
Before changing the DTOS40CVL051A tuner, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding tuner pins and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Attention TV owners! Attempts at self-repair of the TOSHIBA 19HV10E are not recommended by the manufacturer and can lead to serious negative consequences!
Repair MainBoard
The appearance of the MainBoard V28A001322A1 is shown in the figure below:
V28A001322A1
The appearance of the power supply
Key Features of the TOSHIBA 19HV10E:
Installed matrix (LCD panel) LTA185AT01.
To power the backlight, a converter is used, combined with a power supply. As power elements of the inverter, keys of the type 9997GH are used.
The necessary supply voltages for all nodes of the TOSHIBA 19HV10E TV are generated by the V71A00023600 power module, or its analogs using 3BR0665JZ microcircuits (Standby).
MainBoard - the main board (motherboard) is a V28A001322A1 module, using RTD2668 B7H49S1, 25Q80 and other chips.
Tuner DTOS40CVL051A provides the reception of television programs and tuning to channels.
Information from an alternative source:
TOSHIBA 19HV10E
Panel Type (Matrix): LTA185AT01
Motherboard: V28A001322A1 PE1006, RTD2668, Tuner: DTOS40CVL051A
PSU & Invertor: V71A00023600, 3BR0665JZ, 9997GH
Remote control: CT-90325 Schematic
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA185AT01
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: 230 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6 (Tr + Td)
Frequency: 60Hz
Lamp Type: 21S1P WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
Brand: TOSHIBA, Model: 19HV10.
Short from TV: LCD, LED backlight, 19 ", 1366x768, 720p HD, sound: 10 watts.
The composition uses MainBoard V28A001322A1 PE1006 and LCD panel (matrix) LTA185AT01.
Power Supply Unit (PSU) V71A00023600 Power Supply.
TOSHIBA 19HV10 LED TV with LTA185AT01 LCD display, 19 "(48 cm) diagonal size in 16: 9 format. The required screen brightness of 230 cd / m² is provided by LED backlighting. Dynamic contrast ratio 8400: 1 is achieved by special control of LEDs. V This model uses side illumination from Edge LEDs. 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 systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p.
The power of the sound system 10 W (2x5 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 x2, audio x2, component, HDMI. 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 operating mode from the network is 22 watts.
Overall dimensions: with stand 454x320x95 mm, without stand 454x312x50 mm.
TV mass: with stand: 3 kg, without stand: 2.9 kg.
Attention! The TOSHIBA 19HV10 LED TV panel LTA185AT01 is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.