Technical description and composition of the SAMSUNG LE19R86WD TV, panel type and applicable modules. The composition of the modules.
SAMSUNG
Model: LE19R86WD
Chassis / Version: GBP19SEN
Panel: M190A1-L02 REV C2
Inverter (backlight): integrated into PSU
PWM Inverter: SEM2005
MOSFET Inverter: SP8M3
Trans Inverter: TM-1224
Power Supply (PSU): BN44-00152B IP-51140T
PWM Power: DM0765R
MainBoard: BN41-00920C BN94-01431D
IC MainBoard: SPU: SEMP690 (MST69981CLD), SPI Flash: MX25L1605D, SOUND: NTP3000
Tuner: BN40-00096A DNOS403MH261B (S)
Control: BN59-00611A
Specifications LE19R86WD
SAMSUNG LE19R86WD
General repair guidelines for TV LCD
Possible malfunctions
- The SAMSUNG LE19R86WD TV does not turn on and does not show any signs of turning on at all. The control buttons and the remote does not respond.
Often in such cases, the BN44-00152B switching power supply is faulty. It is necessary to measure its output voltages, and in case of their absence, check the power switches and rectifier diodes of the converter for a short circuit.
In case of breakdowns of the diodes 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 usually breaks.
A key breakdown in the PWM controller DM0765R can sometimes be caused by malfunctions of other elements, for example, power supply, frequency-setting, damper, as well as elements of the Negative Stabilization Feedback.
PWM microchip (PWM) DM0765R is checked by replacing it with a new or obviously working one.
- There is no image, there is sound, there is a reaction to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
A 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 the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, the breakdown keys and the transformer secondary windings must be ringed in its converter.
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 operations, 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 indicator blinks or glows constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the BN41-00920C motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, you should 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 - SPU: SEMP690 (MST69981CLD), SPI Flash: MX25L1605D, SOUND: NTP3000 which may require replacement with new ones. If the 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).
No picture in the presence of a signal SAMSUNG LE19R86WD is often caused by a malfunction of the display backlight. And the problem can be both inside the LCD panel (matrix) M190A1-L02 REV C2, e.g. malfunction of CCFL lamps (EEFL), and outside in their power supply - the inverter.
Without backlighting, you can sometimes see a faintly visible image with a certain amount of external light hitting the screen.
The LCD panel M190A1-L02 often needs to be disassembled to repair the backlighting - the process is painstaking and requires extra attention and accuracy from the master. In such cases it is possible with the slightest care to damage the glass or plumbing loops and the TV set can become unrepairable.
Strictly do not recommend to perform such actions to owners of TV sets and masters who have no experience in LCD panels repair! Especially at home (at the owner's home).
If there is no image with backlight - the screen becomes a little lighter when you turn on the TV, and if the TV is open, the light from the lamps can be seen through the holes in the body of the panel.
In this case the malfunction may be inside the panel, damage to the strips, stubs, the T-CON (Timing Controller) board may be faulty. But it often turns out to be defective and the main board MainBoard BN41-00920C, is also possible and software failure.
In such cases the master in the first place must check the main panel power supply voltage on the LVDS connector, fuses on the T-CON board or panel strips, as well as supply and reference voltages for line and column drivers - VGH, VGL, Vcom.
If all of the above measurements are within normal limits, then an oscilloscope should trace the LVDS signals from the MainBoard BN41-00920C, as well as synchronizing signals from the T-CON to the driver stubs.
Malfunction of the tuner BN40-00096A DNOS403MH261B (S) is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Owners and users of the SAMSUNG LE19R86WD TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!...........
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL PSU UNIT ------------------> BN44-00152B
The appearance of the MainBoard BN41-00920C is shown in the figure below:
BN41-00920C
BN41-00920C can be used in TVs:
SAMSUNG LE19R86WD (Panel M190A1-L02 REV C2), SAMSUNG LE19R86BD (Panel M190A1-L07).
The appearance of the power supply
Main features of the SAMSUNG LE19R86WD device:
Installed matrix (LCD panel) M190A1-L02 REV C2.
To power the backlight, a converter is used, combined with a power supply, controlled by the SEM2005 PWM controller. A transformer TM-1224 is installed in the inverter converter. As power elements of the inverter, keys of the type SP8M3 are used.
The formation of the necessary supply voltages for all nodes of the SAMSUNG LE19R86WD TV is carried out by the BN44-00152B power module, or its analogues using DM0765R microcircuits.
MainBoard - the main board (motherboard) is a BN41-00920C module using SPU chips: SEMP690 (MST69981CLD), SPI Flash: MX25L1605D, SOUND: NTP3000 and others.
The tuner BN40-00096A DNOS403MH261B (S) provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CMO
Model: M190A1-L02
Type: a-Si TFT-LCD, Panel
Diagonal size: 19.0 inch
Resolution: 1440x900, WXGA +
Display Mode: TN, Normally White, Transmissive
Active Area: 410.4x256.5 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 850: 1
Display Colors: 16.2M (6-bit + FRC)
Response Time: 1.5 / 3.5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V
The M190A1-L02 matrix and MainBoard software BN41-00920C provide high quality HD viewing at 1440x900 pixels in 720p (HD Ready). Input analog video signal is decoded in PAL, SECAM, NTSC systems. Graphic processing of digital signal is performed in 480i, 480p, 576p, 720p, 1080i.
The sound system capacity of 6 W (2x3 W) is provided by two speakers. NICAM stereo sound processing system and Sound Surround surround function are used.
Communication with other devices via an external interface is supported by standard input and output sockets: Antenna input (RF), AV, audio x4, S-Video, component, SCART, RGB, VGA, HDMI. There is a headphone jack. There is a VGA (D-Sub 15) connector to connect a computer or laptop to this TV model. This interface supports standard resolutions: 640x480, 800x600, 1024x768. The digital tuner is capable of receiving TV channels in DVB-T standards.
The power consumed by the worker in mains mode is 55 W. The power supply is BN44-00152B.
Dimensions: with stand 480x393x180 mm, without stand 480x361x58 mm.
The TV mass: 5.2 kg.
Warning. The panel M190A1-L02 of the SAMSUNG LE19R86WD LCD TV is its most expensive component.
Avoid hitting the glass and pressure on the screen surface to avoid permanent damage to the LCD panel!
