Technical description and composition of the SAMSUNG LE19R86BD TV, type of panel and applicable modules. The composition of the modules.
SAMSUNG
Model: LE19R86BD
Chassis / Version: GBP19SEN
Panel: M190A1-L07
T-CON: M190A1-L06-X + C
Inverter (backlight): integrated into PSU
PWM Inverter: SEM2005
MOSFET Inverter: SP8M3
Trans Inverter: TM-1224
Power Supply (PSU): BN44-00152B IP51140T
PWM Power: DM0765R
MainBoard: BN41-00920C BN94-01431C
IC MainBoard: SPU: SEMP690 (MST69981CLD), SPI Flash: MX25L1605D, SOUND: NTP3000
Tuner: BN40-00096A DNOS403MH261B (S)
Control: Remote: BN59-00611A, IR: BN41-00848A
Specifications LE19R86BD
SAMSUNG LE19R86BD
General repair guidelines for TV LCD
Possible malfunctions
- SAMSUNG LE19R86BD TV does not turn on, does not respond to the remote control and control panel buttons, indicators do not light up and do not blink.
Typically, with such manifestations, the defect is caused by faulty elements in the main power module BN44-00152B. Then it is necessary to measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of power switches and rectifier diodes of the converters for the presence of a possible short circuit.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And during short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
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. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) DM0765R, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- 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 for 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 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.
No picture in the SAMSUNG LE19R86BD is often caused by the malfunction of the display backlight. Moreover the problem can be both inside the LCD panel (matrix) M190A1-L07, e.g. malfunction of CCFL lamps (EEFL), and outside in their power supply - the inverter.
Without a backlight you can sometimes see a faintly visible image with a certain amount of external light hitting the screen.
Disassembly of M190A1-L07 LCD panel is often required to repair the backlighting - the process is laborious and requires a lot of attention and accuracy from the craftsman. In such cases it is possible that with the slightest carelessness the LCD panel might be damaged, and the TV set might become unrepaired.
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.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights up constantly or blinks.
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). When repairing an MB board, you need to check its components SPU: SEMP690 (MST69981CLD), SPI Flash: MX25L1605D, SOUND: NTP3000. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
The 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.
Attention! Users and owners of LE19R86BD TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> SAMSUNG LE19R86BD Chassis GBP19SEN
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 LE19R86BD device:
Installed matrix (LCD panel) M190A1-L07.
The matrix control uses the Timing Controller (T-CON) M190A1-L06-X + C.
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 LE19R86BD TV is carried out by the
BN44-00152B power module, or its analogs 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-L07
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: 380 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
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
SAMSUNG LE19R86BD TV with M190A1-L07 LCD screen, 19" (48 cm) diagonal in 16:10 aspect ratio. The required brightness of 300 cd/m² is provided by backlighting with CCFL(EEFL) fluorescent lamps. Contrast, as a ratio of maximum to minimum brightness, is 800:1. The 2000:1 dynamic contrast ratio is achieved by specifically controlling the backlighting operation depending on the brightness of the scene.
The M190A1-L07 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 through 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.
Overall dimensions: with stand 480x393x180 mm, without stand 480x361x58 mm.
TV weight: with stand: 5.2 kg, without stand: 4.7 kg.
TV LCD Model Year: 2007
Screen diagonal size: 19" (48 cm)
Screen Format: 16:10
Maximum resolution: 1440x900
Matrix: M190A1-L07
Picture-in-Picture (PIP): Yes
Support HD: 720p HD
Brightness: 300 cd/m2
Contrast: 800:1
Dynamic Contrast: 2000:1
Viewing Angle: 160°
Pixel response time: 5 ms
Progressive scan: Yes
TV Standards: PAL, SECAM, NTSC
Digital tuner: DVB-T
Teletext: 1000 page memory.
DTV formats: 480i, 480p, 576i, 576p, 720p, 1080i
Stereo audio: available. NICAM STEREO
Sound power: 6W (2x3W)
Acoustics: two speakers
Headphone jack: there is
Interface: AV, Audio x4, S-Video, Component, SCART, RGB, VGA, HDMI
TV weight: with stand: 5.2 kg
without stand: 4.7 kg
Dimensions with stand: 480x393x180mm
Dimensions without stand: 480x361x58mm
Mains power consumption: 55W
Warning. The M190A1-L07 LCD TV panel is the most expensive part of the SAMSUNG LE19R86BD TV.
Avoid impacts to the glass and pressure on the surface of the screen to avoid permanent damage to the LCD panel!
