Technical description and composition of the BBK LT1511S TV, panel type and applicable modules. The composition of the modules.BBK
Model: LT1511S
Panel: PV154TVM C03H
Inverter (backlight): PI-xxxxTLTX 25-860-AB0-154BTLTB-SH, 899-AB0-154BTLTB-SH AC + INVERTER + I / O PI-154BTLTB
PWM Inverter: TL494C (16)
MOSFET Inverter: 40P03-20 (3), 4511GD (8)
Trans Inverter: J30-703-150BTLTA
PWM Power: LD7575PS (PWM flyback)
MainBoard: PTD6E901086001584 899-AJ1-BF1692TP1H
Tuner: 899-C00-AF2294UP1H PUFT200107A015367
Control: S0807930
Technical Specifications LT1511S
BBK LT1511S
General recommendations for repairing TV LCD
Possible malfunctions
- BBK LT1511S does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
With such manifestations, in most cases, the power module 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 case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during short circuit in the elements of the primary circuit, the mains fuse usually 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 an excess of the maximum current or voltage. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power key may be PWM (PWM) LD7575PS (PWM flyback). It is checked only by replacement with a known good one.
- 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.
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 inverter. If all the electrolytic capacitors of the filter according to the power supply of the inverter are working, make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
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 PTD6E901086001584 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software).
If there is no reception of television channels, but the TV is working properly from external devices, first of all you need to check the voltage of the tuner 899-C00-AF2294UP1H PUFT200107A015367 and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
TV users and owners must remember that attempts to self-repair a BBK LT1511S TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
Main features of the BBK LT1511S device:
SCHEMATIC / MANUAL -------------> BBK LT1511S, LT1911S, LT2011S (BF1692-TP1)
Installed matrix (LCD panel) PV154TVM C03H.
The PI-xxxxTLTX inverter is used to power the backlight lamps, it is controlled by the TL494C PWM controller (16). A transformer J30-703-150BTLTA is installed in the inverter converter. As power elements of the inverter, keys of the type 40P03-20 (3), 4511GD (8) are used.
The necessary supply voltage for all nodes of the TV BBK LT1511S provides a switching power supply using chips LD7575PS (PWM flyback).
MainBoard - the main board (motherboard) is a module PTD6E901086001584.
The tuner 899-C00-AF2294UP1H PUFT200107A015367 provides the reception of television programs and tuning to channels.