Technical description and composition of the SONY LDM-3000 TV, panel type and applicable modules. The composition of the modules.SONY
Model: LDM-3000
Panel: LC300W01 (A3) (P7)
T-CON: 6870C-0002C
Inverter (backlight): KLS-300W4 KLS-300
Power Supply (PSU): 1-688-557-11 (1-722-741-11)
PWM Power: MCZ3001D, STR-A6459
MOSFET Power: 2SK2842
MainBoard: 1-687-411-14 (172230014)
IC MainBoard: CXD9756R, F2134AFA20V, TFP501PZP
Control: IR: 1-687-409-14
Technical Specifications LDM-3000
SONY LDM-3000
General recommendations for repairing TV LCD
Possible manifestations of defects
- SONY LDM-3000 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.
Often in such cases, the power module 1-688-557-11 is faulty. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches (2SK2842) and rectifier diodes in the converters for a short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often breaks.
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 microcircuits MCZ3001D, STR-A6459 are usually checked by replacing with new ones, or obviously working.
- 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
These manifestations can be triggered by a power module, or by defects in the inverter, as well as a distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the inverter power supply are serviceable, you should make sure that the lamps are in good working condition, 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 their completion 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 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 1-687-411-14 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements CXD9756R, F2134AFA20V, TFP501PZP. BGA chip malfunctions are usually easy to detect by warming up.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
The appearance of MainBoard 1-687-411-14 is shown in the figure below:1-687-411-14
The appearance of the power supply
Main features of the device SONY LDM-3000:
Installed matrix (LCD panel) LC300W01 (A3) (P7).
The matrix control uses the Timing Controller (T-CON) 6870C-0002C.
To power the backlight used inverter KLS-300W4.
The necessary supply voltages for all nodes of the SONY LDM-3000 TV are generated by the power module 1-688-557-11, or its analogs using microchips MCZ3001D, STR-A6459 and power switches of the type 2SK2842.
MainBoard - the main board (motherboard) is a 1-687-411-14 module, using CXD9756R, F2134AFA20V, TFP501PZP, and others.
Brand: SONY, Model: LDM-3000.
Shortly from the TV: LCD, 30 ", there is PIP, sound: 20 W, DVI.
The composition uses MainBoard 1-687-411-14 and LCD-panel LC300W01 (A3) (P7).
Power Supply Unit (PSU) 1-688-557-11 (1-722-741-11) Power Supply.
SONY LDM-3000 TV with LC300W01 LCD display, diagonal size 30 ", 16: 9 format. Analog input video signal can be processed in PAL, SECAM, NTSC systems.
The power of a sound speaker system of 20 W is provided by 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), AV, SCART x4, RGB. An output for connecting headphones is provided.
Overall dimensions: 974x530x95 mm.
TV Weight: 20 kg.
Attention! The LC300W01 (A3) (P7) panel of the SONY LDM-3000 LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!