Technical description and composition of the DEXP H19D7100E TV, panel type and applicable modules. The composition of the modules.DEXP LED
Model: H19D7100E / W
Chassis / Version: TE.S512.EA67
Panel: CX185LEDM
LED driver (backlight): integrated into PSU
PWM LED driver: OB3350CP
MOSFET LED driver: AOD450
Power Supply (PSU): MP24S-CX 2A
PWM Power: OB2273
MOSFET Power: TO-220
MainBoard: TE.S512.EA67
IC MainBoard: SPI Flash GD25Q64, Audio: YD1517P
Tuner: NoName
Technical Specifications H19D7100E
DEXP H19D7100E
General repair guidelines for TV LCD LED
Possible malfunctions
- The DEXP H19D7100E TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
Often in such cases, the MP24S-CX power module is faulty. It is necessary to measure its output supply voltages, and in case of their absence, check the serviceability of power switches (TO-220) of converters and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short-circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the main fuse and, less often, the current sensor at the source of the key are most often cut off.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM circuits (PWM) OB2273 are usually checked by replacing with new, or obviously working.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
Usually in such cases there is no backlight LED-panel (matrix). The reason can sometimes be in the power of the LEDs, but more often in their malfunction (breakdown or break), sometimes in the violation of the contact connections of the LED strips.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required. Then it is necessary to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow you to open the LED in the forward direction or dual LEd are used, then the PN junction of the emergency zener diode can indirectly serve as a health indicator. In case of LED-a failure, the zener diode PN junction will either be cut off or broken into short-circuit.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the TE.S512.EA67 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). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements SPI Flash GD25Q64, Audio: YD1517P requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
If a NoName tuner is suspected of a malfunction, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary supply voltage levels and data exchange pulses with the processor via the I2C bus at the corresponding tuner pins.
Owners of the H19D7100E TV are recommended to repair only qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
FIRMWARE FOR SPI FLASH -----------> DEXP H19D7100E/W, Main: TE.S512.EA67, Panel: CX185LEDM
The appearance of MainBoard TE.S512.EA67 is shown in the figure below:TE.S512.EA67
The appearance of the power supply
Main features of the DEXP H19D7100E device:
Installed matrix (LED-panel) CX185LEDM.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the OB3350CP PWM controller. As power elements of the LED driver, keys of the AOD450 type are used.
The necessary supply voltages for all nodes of the DEXP H19D7100E TV are generated by the MP24S-CX power module or its analogs using OB2273 microcircuits and TO-220 type power switches.
MainBoard - the main board (motherboard) is a TE.S512.EA67 module, using SPI Flash GD25Q64, Audio: YD1517P, and others.
The NoName tuner provides television reception and channel tuning.
DEXP H19D7100E TV with CX185LEDM LCD, 19 "(48 cm) diagonal size of 16: 9 format. The required screen brightness of 200 cd / m² is provided by LED backlighting. Contrast - the ratio of maximum brightness to minimum is 1000: 1. In LCD - panels use direct LED backlighting - Direct LED. You can watch programs and movies and images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). Supported media file formats: MP3, WMA, Xvid, DivX, JP EG.
The power of the sound system 10 W (2x5 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), component, VGA, HDMI, USB. An output for connecting headphones is provided. A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
The power consumed by the TV working in the network mode is 36 watts.
Overall dimensions: with stand 440x299x165 mm, without stand 440x268x51 mm.
TV Weight: with stand: 2.35 kg, without stand: 2.29 kg.
Attention! The CX185LEDM panel of a DEXP H19D7100E LED TV 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.