Technical description and composition of the SAMSUNG LE32R72B TV, panel type and applicable modules. The composition of the modules.SAMSUNG
Model: LE32R72B
Chassis / Version: GBR32KE
Panel: T315XW02 V.0
Lamp backlight: CCFL Embedded
T-CON: T315XW02 V0
Inverter (backlight): I315B1-16A
PWM Inverter: OZ964GN
MOSFET Inverter: AO4614
Trans Inverter: 4013L = 4018L
Power Supply (PSU): BN96-03775A Rev 1.2
PWM Power: VIPer22A (Stb), F9222L, TDA4863G (PFC)
MOSFET Power: STP20NM60
MainBoard: BN41-00680D
IC MainBoard: M30840SGP, STA323W, 3F866BXZZ-QZ8B, Q53125S1G
Tuner: BN40-00079A
Specifications LE32R72B
SAMSUNG LE32R72B
General repair guidelines for TV LCD
Possible manifestations of defects
- SAMSUNG LE32R72B TV does not turn on at all. There is no reaction to the remote control and control buttons from the front panel. Indicator lights do not light or flash.
In such cases, the fault should be sought first in the BN96-03775A power supply module. 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 (STP20NM60) and rectifier diodes of converters for possible short circuit.
In the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often breaks.
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) VIPer22A (Stb), F9222L, TDA4863G (PFC), 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 commands from the remote control. Or the image appears immediately after turning on and disappears.
These manifestations can be triggered by a power supply module, or by inverter defects, as well as distortion of the currents in the lamps due to their uneven wear. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of the transformers for an open.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the BN41-00680D 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements M30840SGP, STA323W, 3F866BXZZ-QZ8B, Q53125S1G. BGA chip malfunctions are usually easy to detect by warming up.
The malfunction of the tuner BN40-00079A is established after checking the software and all the supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair to professionals with sufficient experience in the repair of electronic equipment.
Service manual and schematic diagram ----> SAMSUNG LE32R72B Chassis GBR32KE
FOR MODELS: LE26R71B, LE32R71B, LE40R71B, LE26R72B, LE32R72B, LE37R72B, LE40R72B.
PSU SCHEMATIC ---> BN96-03775A Power supply.
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 LE32R72B device:
Installed matrix (LCD panel) T315XW02 V.0.
The matrix control uses the Timing Controller (T-CON) T315XW02.
To power the backlight, an inverter I315B1-16A is used, it is controlled by the PWM controller OZ964GN. A transformer 4013L = 4018L is installed in the inverter converter. As power elements of the inverter, keys of the type AO4614 are used.
The necessary supply voltages for all nodes of the SAMSUNG LE32R72B TV are generated by the BN96-03775A power module or its analogs using VIPer22A (Stb), F9222L, TDA4863G (PFC) microcircuits and STP20NM60 type power switches.
MainBoard - the main board (motherboard) is a BN41-00680D module, using chips M30840SGP, STA323W, 3F866BXZZ-QZ8B, Q53125S1G and others.
The tuner BN40-00079A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: T315XW02 V0
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: AMVA, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit)
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V