Technical description and composition of the SAMSUNG LE32S71B TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE32S71B LE32S71BS
Chassis / Version: LE32S71BS / KLG
Panel: V315B1-L01 Rev. C2 (CHI MEI)
T-CON: V315B1-C01 U1, EM636165TS-7G, AS15-G, 0644B, B6816C62, CM2681A-KQ
Inverter (backlight): I315B1-16A-C001E (CHI MEI)
PWM Inverter: OZ964GN, BA10324AF
MOSFET Inverter: AO4614A
Trans Inverter: 4018L, 4013L
Power Supply (PSU): BN96-03057A - PSLF201501B
PWM Power: VIPer22A (Standby)
MainBoard: BN41-00680D BN94-01031E DAFU
IC MainBoard: M30840SGP, STA323W, 3F866BXZZ-QZ8B, Q53125S1G, STV8257DSX, A21SC, 24C32WP, ASM1934ASF, MP1583DN, PCM1754, A21SC, 78M08A, 78M09A, AP358, MAX2EC
Tuner: BN40-00079A TCPW3001PD32S (H)
Technical Specifications LE32S71B
SAMSUNG LE32S71B
General repair guidelines for TV LCD
SAMSUNG LE32S71BS TV, like any other, it is advisable to start repairing with an inspection of internal and external elements. Visible damage to elements can sometimes suggest directions for finding a defect even before the necessary measurements are taken. In most cases, the repairman can guess the causes of the defect and possible consequences by the characteristic signs of typical TV defects, for example, ring cracks formed in the soldering of element outputs, swollen rectifier filter capacitors, charred resistors and other circuit elements.
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 probability that the power 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. In this case, the diagnosis and repair of the common power supply should always be started by checking the mains fuse. When it is broken, it is advisable to check for a breakdown, first of all, all power semiconductor elements of the converter and the rectifier diode bridge of the network, as well as the large electrolytic capacitor of the filter of the network rectifier and the key transistor.
As a rule, the keys of flyback converters, which use an N-Fet field effect transistor on a separate radiator, or integrated with a PWM controller in a single chip, are reliable enough and rarely fail for no reason. The reasons for the breakdown of the key should be sought by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is checked by replacing it with a known good one.
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.
If the SAMSUNG LE32S71BS does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction of the display backlight, or their power converter - inverter. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the inverter itself, including in the secondary rectifier of the main power supply.
Diagnostics and repair of the inverter are often complicated by the organization of special protection circuits, which is necessary for fire safety and turns off the inverter in any emergency situation, for example, when the lamps are worn or depressurized. Often, to localize a defect, its blocking is required.
All necessary precautions must be observed when disabling the inverter protection during diagnostics and not leaving it disconnected after the repair is completed.
It should be remembered! Attempts to repair the SAMSUNG LE32S71BS TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
One of the typical defects of a SAMSUNG LE32S71BS TV can occur in the V315B1-L01 C2.
External manifestations: color distortion in the image as a negative in the image, light tones predominate. Usually in such cases, the AS15-G gamma corrector is faulty. Another indicator of its malfunction is an excessively strong heating, which in practice allows you to do without measuring the voltage gradations of gray.
In most cases, replacing the AS15-G solves the problem.
It should be remembered that similar symptoms can cause faults in the column drivers of the panel, which is usually indicated by interference in the form of even vertical stripes on the screen. Then, after replacing the AS15-G, the situation does not change. Drivers are in loops and cannot be replaced. In this case, it is necessary to replace the glass panel.
SCHEMATICS ----> Samsung LE27S71B, LE32S71B, LE37S71B, LE40S71B Chassis GSM27SE - GSM40SE.
INVERTER SCHEMATIC I315B1-16A -----> I315B1-16A Inverter Schematic.
The appearance of the MainBoard BN41-00680D is shown in the figure below:BN41-00680D
BN41-00680D can be used in TVs:
SAMSUNG LE26R71B (Panel T260XW02 V.5), SAMSUNG LE27S71B (Panel V270B1-L01), SAMSUNG LE27S71BS (Panel V270B1-L04), SAMSUNG LE32S71BS LE32S71B (Panel V315B1-L01 Rev.C2 (SAMSUNG LEB) -L01 0T1), SAMSUNG LE32R71B (Panel V320B1-L01 REV.C4), SAMSUNG LE32R72B (Panel T315XW02 V.0).
The appearance of the power supply
Main features of the SAMSUNG LE32S71B device:
Installed matrix (LCD panel) V315B1-L01 Rev. C2 (CHI MEI).
The matrix control uses the Timing Controller (T-CON) V315B1-C01.
To power the backlight, the inverter I315B1-16A-C001E is used, it is controlled by the PWM controller OZ964GN, BA10324AF. The transformer 4018L, 4013L is installed in the inverter converter. As power elements of the inverter, keys of the type AO4614A are used.
The necessary supply voltages for all nodes of the SAMSUNG LE32S71B TV are generated by the BN96-03057A power module or its analogs using VIPer22A (Standby) microcircuits.
MainBoard - the main board (motherboard) is a BN41-00680D module, using microcircuits M30840SGP, STA323W, 3F866BXZZ-QZ8B, Q53125S1G, STV8257DSX, A21SC, 24C32WP, ASM1934ASF, MP1583DN, PCM8358758, MCA, 78198 others.
Tuner BN40-00079A TCPW3001PD32S (H) provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CMO
Model: V315B1-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1500: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: 16 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V