Technical description and composition of the SAMSUNG LE19R71B TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE19R71B
Chassis / Version: GBE19SE
Panel: M190A1-L07 // M190A1-L02 RevC2
Inverter (backlight): SIP-W19A
PWM Inverter: FAN7311 (20)
MOSFET Inverter: 4525GEM
Trans Inverter: TMS90631CT
Power Supply (PSU): SIP-W19A
PWM Power: DM0465R
MainBoard: NB41-00802A BN94-01036F
IC MainBoard: SE6181LA-LF, TDA7266D, VCT49X3R
Tuner: BN40-0072A
Technical Specifications LE19R71B
SAMSUNG LE19R71B
General repair guidelines for TV LCD
Any repair of electronic equipment begins with a careful external inspection of the device and troubleshooting. In this case, you should carefully examine all the elements of the SAMSUNG LE19R71B TV, both internal and external. Often, based on certain external signs, it is possible to draw some conclusions about the reasons for the failure of certain circuit elements even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. Electrolytic capacitors of filters with a swollen body, as well as ring cracks or a layer of coal formed on the resistors of heating elements, sometimes give the repairman the reasons for the malfunction and possible consequences.
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when turned on, there is a certain chance that the SIP-W19A power supply module is defective and needs repair. Sometimes with similar manifestations, a problem can only occur in the absence of processor power, but this happens much less often. When diagnosing and repairing the power supply, first of all, it is necessary to check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module - rectifier diodes or power key.
It should be remembered that in the practice of repair, usually the power keys of N-Fet converters do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the DM0465R PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
When using a power factor correction unit (PFC) in the power modules, troubleshooting becomes somewhat more complicated and requires additional experience and knowledge of the device for their operation.
In cases where the SAMSUNG LE19R71B TV has lost an image, and the sound is there and all other functions are operational, there is a possibility of an inverter (converter for powering the backlight) malfunction. When you turn on the TV, the image may appear briefly and immediately disappear. It should be borne in mind that with such manifestations, the lamps themselves also fail, the malfunction of which can be detected by replacement, by connecting to the connectors for diagnostics that are known to be serviceable and suitable in power.
Repair of the SIP-W19A inverter can often be somewhat complicated by the use of special protection circuits, which are designed to disconnect it in emergency cases for fire safety during depressurization of lamps, or short circuits or breaks in high-voltage circuits and connections. Sometimes it becomes necessary for diagnostic purposes to block the protection circuits in order to be able to make the necessary measurements at the control points of the circuit.
It should be remembered that when the protection is turned off, there is always a risk of failure of the power elements of the inverter during diagnosis. After repair, it is imperative to restore all standard converter protection circuits.
Repair of the BORDEAUX19 motherboard should begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
Remember! Attempts to self-repair by users of the SAMSUNG LE19R71B TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
Main features of the device SAMSUNG LE19R71B:Installed matrix (LCD panel) M190A1-L07 or M190A1-L02 RevC2.
To power the backlight, an SIP-W19A inverter is used, it is controlled by the FAN7311 PWM controller (20). The transformer TMS90631CT is installed in the inverter converter. As power elements of the inverter, keys of type 4525GEM are used.
The formation of the necessary supply voltages for all nodes of the SAMSUNG LE19R71B TV is carried out by the SIP-W19A power module, or its analogs using DM0465R microcircuits.
MainBoard - the main board (motherboard) is a BN41-00802A module, using chips SE6181LA-LF, TDA7266D, VCT49X3R and others.
The tuner BN40-0072A 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