SAMSUNG
Model: LE32R81BX LE32R81
Chassis / Version: GBP32SEU
Panel: V315B1-L01 Rev. C3
T-CON: V315B-C01 CM2681A-KO EM636165TS-7G AS15-G
Inverter (backlight): VIT70043.50 REV0, I315B1-16A - C302G
PWM Inverter: OZ964GN (20 pin), BA2902F
MOSFET Inverter: AOD604 (5pin), BD729P
Trans Inverter: 4018L
Power Supply (PSU): BN44-00192A MK32P3
PWM Power: STR-A6159 (Standby), MC33067P, MC33167T
MOSFET Power: 5N50C, 11N60
MainBoard: BN41-00839E BN94-01311F
IC MainBoard: 7568U-LF, M308AOSGP, EM6A9320BI-4MG, NTP-3000, MAX232EC, 24C256BN, 74HC4052D, SIL9185CTU
Tuner: HTM2-6L2 / 235S
Control: BN59-00602A
Specifications LE32R81B
SAMSUNG LE32R81BX
General repair guidelines for TV LCD
Like any other TV, SAMSUNG LE32R81BX repair is advisable to start with a careful examination of the external and internal elements. It often happens that some damage to elements or connections will help determine the direction of troubleshooting and localization of the defect. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in soldering will help the master to guess the causes and possible consequences of the malfunction.
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, it does not make any sounds or any signs of operability when it is turned on, there is a certain chance that the MK32P3, BN44-00192A 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. The diagnostics of the power supply should always be started by checking the fuse and, if it is broken, it is first necessary to check the rectifier bridge diodes and the power switch 5N50C, 11N60 for the possibility of an avalanche or thermal breakdown.
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 reason 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 STR-A6159, MC33067P, MC33167T 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.
It is somewhat more difficult to look for a malfunction in the converter of the power module with an active KKM (power factor corrector).
Sometimes the SAMSUNG LE32R81BX TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the converter of the backlight lamps, or of the lamps themselves, which can be checked by replacement. In such cases, it is necessary to verify the serviceability of all the electrolytic capacitors of the filter according to the power supply of the inverter itself, including the power supply unit (power supply unit).
In most cases, the diagnosis and repair of the VIT70043.50 REV0, I315B1-16A - C302G inverter is difficult due to the organization of protection, which turns it off in emergency cases to avoid fires during short circuits or open circuits in high voltage circuits and during depressurization of lamps. Often, repairmen block the protection circuits in order to make the necessary measurements at the control points of the inverter to identify the causes of the defect.
In such cases, special care should be taken during diagnosis, and after completion of all repair work, it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
Repair of the motherboard BN94-01311F (BN41-00839E) must 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. If it is not possible to replace the MB (SSB) card, you need to check the health of its elements - 7568U-LF, M308AOSGP, EM6A9320BI-4MG, NTP-3000, MAX232EC, 24C256BN, 74HC4052D, SIL9185CTU, Tuner: HTM2-6L2 / 235S. Defective components should be replaced.
Owners and users of the SAMSUNG LE32R81BX TV must 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!
One of the typical defects of a SAMSUNG LE32R81BX TV can occur in the V315B1-L01 Rev. C3
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.
PSU SCHEMATICS----> BN44-00192A/B.
SCHEMATICS ---> 32R81BX Chassis GBP32SEN.
SCHEMATIC OF INVERTER I315B1-16A I315B1-16A Invertor Schematic.
LE32R81BX/BWT - Panel: LTA320WT-L08, T-Con: 320WTC2LV4.8; MainBoard: BN41-00839E.
LE32R81WX-AST - Panel: V315B1-L01 Rev.C3.
The appearance of the MainBoard BN41-00839E is shown in the figure below:BN41-00839E
BN41-00839E can be used in TVs:
SAMSUNG LE32R81B LE32R81W (Panel LTF320AB01), SAMSUNG LE32R81BX (Panel V315B1-L01 Rev. C3), SAMSUNG LE37R82BX LE37R82B (Panel T370XW02 V6), SAMSUNG LE40R82BX (Panel LTA400WTLT. 081, LT40BTWT-L07 081, LT40BTL07
The appearance of the power supply
Main features of the SAMSUNG LE32R81BX device:
Installed matrix (LCD panel) V315B1-L01 Rev. C3
The matrix control uses the Timing Controller (T-CON) V315B-C01.
To power the backlight, an inverter VIT70043.50 is used, it is controlled by the PWM controller OZ964GN (20 pin), BA2902F. The transformer 4018L is installed in the inverter converter. As power elements of the inverter, keys of the type AOD604 (5pin), BD729P are used.
The necessary supply voltages for all nodes of the SAMSUNG LE32R81BX TV are generated by the BN44-00192A power module, or its analogs using the STR-A6159 (Standby), MC33067P, MC33167T microcircuits and power switches of the 5N50C, 11N60 type.
MainBoard - the main board (motherboard) is a BN41-00839E module, using chips 7568U-LF, M308AOSGP, EM6A9320BI-4MG, NTP-3000, MAX232EC, 24C256BN, 74HC4052D, SIL9185CTU and others.
The HTM2-6L2 / 235S tuner provides TV reception and channel tuning.
Information from an alternative source:
SAMSUNG LE32R81BX (BS) Chassis GBP32SEN
Panel Type (Matrix): V315B1-L01 Rev. C3
Motherboard: BN94-01311F (BN41-00839E), 7568U-LF, SDP64, M308AOSGP, EM6A9320BI-4MG, SGTV5810C, SIL9185CTU, NTP-3000, MAX232EC, 74HC4052D, 24C256BN, Tuner2 23M2
T-con: V315B-C01, CM2681A-KO, EM636165TS-7G (x2), AS15-G
Invertor: I315B1-16A - C302G, OZ964GN, BA2902F (x2), BD729P (x8), 4018L (x8)
PSU: BN44-00192A, STR-A6159, MC33067P, 5N50C (x2), 11N60, MC33167T
Remote control: BN59-00602A PSU schematic
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