Technical description and composition of the BBK LT2230HDL TV, type of panel and applicable modules. The composition of the modules.BBK LED
Model: LT2230HDL
Chassis / Version: CVMV26L-B-30
Panel: HK215LEDM-PH11H CLAB215FA01
LED backlight: 04T-WP24436-0251-E2HB2 2, 04S-WP24434-0229-E2GB2; 490x4 80Led
LED driver (backlight): integrated into PSU
PWM LED driver: MP3389EF
MOSFET LED driver: AM4490N
Power Supply (PSU): LK-PL220202A REV1.5
PWM Power: LD7576AGR
MainBoard: CVMV26L-B-30
IC MainBoard: TSUMV26KE-LF, EN25F40-100GCP, 24C32, 24C02, TDA1517P
Tuner: F21WT-3BAR-E TCL1001506622
Technical Specifications LT2230HDL
BBK LT2230HDL
General repair guidelines for TV LCD LED
Possible malfunctions
- The BBK LT2230HDL 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 some of these cases, a malfunction is detected in the LK-PL220202A power supply module. Then we recommend that you measure its output voltages and, if they are absent, you should check the health of the power switches and rectifier diodes of the converters for a probable short circuit.
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.
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) LD7576AGR, 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 and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source. By opening the panel, each LED can be checked separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect probes in the forward direction to it. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the CVMV26L-B-30 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). In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - TSUMV26KE-LF, EN25F40-100GCP, 24C32, 24C02, TDA1517P which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
Before changing the tuner F21WT-3BAR-E TCL1001506622, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
To reduce the backlight current in LED drivers with a PWM controller MP3389EF (MP3389), or its analogue OB3362VP (28 pin), it is necessary to proportionally increase the total resistance of the resistors from pin 9 (ISET) to the chassis. The maximum current in each of the 12 channels (in milliamps) for the resistance Rset (in kilo-ohms) is determined from the ratio 1000 * 1.22V / Rset. With a parallel connection of channels, currents are summed.
Repair MainBoard
The appearance of the MainBoard CVMV26L-B-30 is shown in the figure below:
CVMV26L-B-30
CVMV26L-B-30 can be used in TVs:
BBK LT2230HDL (Panel HK215LEDM-PH11H CLAB215FA01), BBK LT1930SL (Panel HK185WLEDM-CH31H M185B3-PA3).
The appearance of the power supply
Main features of the BBK LT2230HDL device:
Installed matrix (LED panel) HK215LEDM-PH11H CLAB215FA01.
To power the backlight LEDs, a converter is used, combined with the power supply, controlled by the MP3389EF PWM controller. As power elements of the LED driver, keys of the AM4490N type are used.The necessary supply voltages for all nodes of the TV BBK LT2230HDL are generated by the power module LK-PL220202A, or its analogs using LD7576AGR microcircuits.
MainBoard - the main board (motherboard) is a CVMV26L-B-30 module, using TSUMV26KE-LF, EN25F40-100GCP, 24C32, 24C02, TDA1517P, and others microcircuits.
Tuner F21WT-3BAR-E TCL1001506622 provides the reception of television programs and tuning to channels.
Brand: BBK, Model: LT2230HDL.
Shortly from the TV: LCD, 1080p Full HD, diagonal 22 "(55 cm), has HDMI, backlight type: Edge LED.
The composition includes MainBoard CVMV26L-B-30 and LCD panel (matrix) HK215LEDM-PH11H CLAB215FA01.
Power Supply Unit (PSU) LK-PL220202A REV1.5 Power Supply.
BBK LT2230HDL LED TV with HK215LEDM-PH11H LCD, diagonal size 22 "(55 cm), 16: 9 format. The required screen brightness of 220 cd / m² is provided by LED backlight LED. The ratio of maximum brightness to minimum (contrast) is 1000 : 1. This model uses Edge LED backlighting, and the design and technical features of the TV include watching broadcasts and films in high quality HD with a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). Input high-frequency or video signal Cash can be processed in analog systems PAL, SECAM, NTSC .. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p.
The power of the acoustic system of sound 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, 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, 1920x1080.
The power consumed by the TV in the operating mode from the network is 50 watts.
Overall dimensions: 526x391x165 mm.
TV Weight: 5 kg.
Attention! The HK215LEDM-PH11H CLAB215FA01 panel of the BBK LT2230HDL 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.