Technical description and composition of the SAMSUNG LE19A656A1D TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE19A656A1D LE19A656S1D
Panel: M190A1-L07
Inverter (backlight): PWI1904ST
PWM Inverter: FAN7316 (20)
MOSFET Inverter: STD3120 (5)
Trans Inverter: TMS92920CT
Power Supply (PSU): BN44-00231A PWI1904ST
PWM Power: Q0565R
MainBoard: BN41-01027C
IC MainBoard: BA7657F NTP3100 WM8521H9GED
Tuner: TDHG6-K10A BN40-00120A
Technical Specifications LE19A656A1D
SAMSUNG LE19A656A1D
General repair guidelines for TV LCD
SAMSUNG LE19A656A1D TV, like any other, it is advisable to start repairing with an inspection of internal and external elements. In some cases, visible external damage to the elements can suggest directions for troubleshooting and localizing the defect before starting the necessary measurements at the control points of the nodes of electronic circuits. Swollen electrolytic or cermet capacitors, charred resistors, ring cracks in the soldered terminals of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
If the power supply module PWI1904ST (BN44-00231A) fails, the external manifestations may be different, for example, SAMSUNG LE19A656A1D does not turn on at all and there is no indication of the indicator lights on the front panel. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and, in the event of a break, the cause should be sought in the power semiconductor elements of the pulsed flyback converter of the main PSU. First of all, it is necessary to check the diodes of the bridge of the rectifier of the mains voltage and the power switch of the converter, which can be installed separately on the radiator, or integrated with a PWM controller.
Power switches in flyback converters fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The reason may be a malfunction of the PWM regulator chip Q0565R, which can only be checked by replacing it with a new or obviously working one.
If an active Power Factor Corrector (CMC) is used in the power module circuitry, it can sometimes become more difficult to troubleshoot. Knowledge, experience, intuition and skills in such cases have a great advantage for a successful repair.
In those cases when the SAMSUNG LE19A656A1D TV has lost its image, and the sound is there and all the other functions are functional, there is a possibility of a malfunction of the inverter (converter for powering the backlight). 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.
Often, attempts to repair the PWI1904ST inverter are hampered by the fact that the fault diagnosis is complicated by the operation of its protection, which is intended to turn off the inverter in emergency conditions - when the lamps are depressurized, breaks or short circuits in high-voltage connections and other emergency situations. Lock protection to localize the defect is popular among repairmen.
It should be remembered that in such cases there is a risk of failure of the power elements of the inverter and to take special care. After carrying out repairs, the protection circuit must be restored for further safe operation of the TV.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - BA7657F, NTP3100, WM8521H9GED and replace the failed chips with new ones.
Attention to users! Self-repair of a SAMSUNG LE19A656A1D TV without the appropriate qualifications and experience can lead to its complete non-repairability................
The appearance of the MainBoard BN41-01027C is shown in the figure below:BN41-01027C
BN41-01027C can be used in TVs:
SAMSUNG LE19A656A1D (Panel M190A1-L07), SAMSUNG LE22A656A1D LE22A656 (Panel LTM220M1-L01).
Main features of the SAMSUNG LE19A656A1D device:
Installed matrix (LCD panel) M190A1-L07.
To power the backlight, an inverter PWI1904ST is used, it is controlled by the FAN7316 PWM controller (20). A transformer TMS92920CT is installed in the inverter converter. As power elements of the inverter, keys of the STD3120 type (5) are used.
The formation of the necessary supply voltages for all nodes of the SAMSUNG LE19A656A1D TV is carried out by the BN44-00231A power module, or its analogs using Q0565R microcircuits.
MainBoard - the main board (motherboard) is a BN41-01027C module, using BA7657F NTP3100 WM8521H9GED chips and others.
Tuner TDHG6-K10A BN40-00120A 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