Technical description and composition of the IZUMI TLE19H212B TV, type of panel and applicable modules. The composition of the modules.IZUMI LED
Model: TLE19H212B
Chassis / Version: JHST140703-1
Panel: LY185-DH
T-CON: V185BJ1-XCE1
LED driver (backlight): integrated into MainBoard
PWM LED driver: PWM 8pin
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MainBoard: JHST140703-1 CHXS1404001 090-590050-20
IC MainBoard: PSU: TSUMV59XU, Spi Flash: 25Q32FVSIG
Tuner: JHST140703-4 20140628/090-RA5156-20
Technical Specifications TLE19H212B
IZUMI TLE19H212B
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The IZUMI TLE19H212B TV does not turn on, does not respond to the remote control and the control panel buttons, does not light up or blink indicators.
In such cases, the common power source is often faulty - an AC / DC voltage converter, which is combined with elements of the main board JHST140703-1. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches and rectifier diodes in the converters for a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the elements of the primary circuit, the mains fuse usually breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback circuits (OOS) of stabilization. PWM controllers (PWM) PWM SOT23-6, if they do not have visible damage to the case and open fault between the terminals, are usually checked by replacement.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
In some of these cases, the malfunction is caused by a lack of backlighting on the display. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
To check the LED strips, to open all the transitions of the LEDs, several tens of volts or more are needed, it is best to use a current source for such purposes. The breakage of several PN junctions connected in series cannot be detected with a multimeter or tester. In such cases, it is necessary to open the panel and check each LED. If your multimeter cannot open the LED transitions in forward bias, you can sometimes detect the presence of a PN junction of the protective zener diode by connecting the probes in the opposite direction. If the zener diode is broken or broken in short-circuit, then the LED is faulty and needs to be replaced.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the motherboard JHST140703-1 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 - PSU: TSUMV59XU, Spi Flash: 25Q32FVSIG. Defective components should be replaced.
Before changing the NoName 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
It should be remembered! Attempts to independently repair the IZUMI TLE19H212B TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
FIRMWARE FOR SPI FLASH -----------> IZUMI TLE19H212B, Main: JHST140703-1 CHXS1404001 090-590050-20, Panel: LY185-DH
The appearance of the MainBoard JHST140703-1 is shown in the figure below:JHST140703-1
Main features of the IZUMI TLE19H212B device:
Installed matrix (LED-panel) LY185-DH.
The matrix control uses the Timing Controller (T-CON) V185BJ1-XCE1.
To power the backlight LEDs, a converter is used, combined with the main board JHST140703-1, controlled by a PWM 8pin PWM controller.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using PWM SOT23-6 microcircuits.
MainBoard - the main board (motherboard) is a JHST140703-1 module using PSU chips: TSUMV59XU, Spi Flash: 25Q32FVSIG and others.
The tuner JHST140703-4 20140628/090-RA5156-20 provides the reception of television programs and tuning to channels.