BBK
Model: LT3215S
Chassis / Version: RSAG7.820.1037
Panel: LC320WX3 (SL) (C1)
T-CON: LC320WX3-SLC1
Inverter (backlight): 6632L-0443B - KLS-EE32HK14A
PWM Inverter: OZ9966SN
MOSFET Inverter: 2SK4075
Power Supply (PSU): HLP-23A01 - LCD3206NEU (1)
PWM Power: NCP1207
MOSFET Power: FQP3N80C
MainBoard: RSAG7.820.1037 - ROH VER.C, LCD3206NEU (1)
IC MainBoard: F40-100GCP, HY50V281622FTP-5, A25L40PUO, 24C32AN, TMDS341A, AP1520, LM833, TPA3101D2
Tuner: TDQ-6FT / W126H
Control: IR: RSAG7.820.975-ROH
Technical Specifications LT3215S
BBK LT3215S
General recommendations for repairing TV LCD
Repair of electronic equipment usually begins with its external inspection and diagnosis of the malfunction. In this case, you should examine all the internal components of the BBK LT3215S TV, as well as the external elements of the case. Often, based on certain external signs, it may be possible to draw certain conclusions about the reasons for the failure of certain elements of the circuit even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.
If the TV does not turn on, no control lights are on or blinking, there are no sounds when you turn on, and there is not the slightest sign of operability - the most likely malfunction is in the power module. When diagnosing and repairing the power supply, first of all, replace the swollen filter capacitors of the secondary rectifiers and 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 and FQP3N80C transistors in the primary circuit.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors in switching power supplies (SMPS) fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, or dried electrolytic capacitors or dangling primary resistors BP circuits involved in the stabilization process. In this case, all semiconductor elements of the strapping of the NCP1207 PWM controller microcircuit are subject to verification, which it is desirable to verify by replacement.
In cases where the BBK LT3215S TV has lost its image, and the sound is there and all the other functions are operational, 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 must 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. When disabling the inverter protection (to enable diagnostics), special care must be taken in view of the risk of failure of the power elements. After completing all repairs, it is imperative to restore the protection circuits for full and safe further operation of the TV by the user.
On the motherboard RSAG7.820.1037 - ROH VER.C, LCD3206NEU (1), in case of a malfunction, you should first check the operation of all the stabilizers and power converters of the microcircuits, and also, if necessary, update the software (software). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - F40-100GCP, HY50V281622FTP-5, A25L40PUO, 24C32AN, TMDS341A, AP1520, LM833, TPA3101D2 with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
Before replacing the TDQ-6FT / W126H tuner, if there is no channel tuning, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Owners and users of the BBK LT3215S 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!
The appearance of the MainBoard RSAG7.820.1037 is shown in the figure below:RSAG7.820.1037
RSAG7.820.1037 can be used in TVs:
BBK LT2614S (Panel V260B1-L02), BBK LT3214S (Panel LC320W01 (SL)(A1)), BBK LT4214S (Panel LC420WX7 Sl A1), BBK LT3215S (Panel LC320WX3 (SL)(C1)), BBK LT4014S (Panel LTA400WT-L17), DAEWOO DLP-26H1C (Panel V260B1-L02).
The appearance of the power supply
Main features of the BBK LT3215S device:
Installed matrix (LCD panel) LC320WX3 (SL) (C1).
The matrix control uses the Timing Controller (T-CON) LC320WX3-SLC1.
To power the backlight, an inverter 6632L-0443B is used, it is controlled by the OZ9966SN PWM controller. As power elements of the inverter, keys of the 2SK4075 type are used.
The necessary supply voltages for all nodes of the BBK LT3215S TV are generated by the HLP-23A01 power module or its analogs using NCP1207 microcircuits and power switches of the FQP3N80C type.
MainBoard - the main board (motherboard) is an RSAG7.820.1037 module, using F40-100GCP, HY50V281622FTP-5, A25L40PUO, 24C32AN, TMDS341A, AP1520, LM833, TPA3101D2 and other chips.
The TDQ-6FT / W126H tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC320WX3-SLC1
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 400 cd / m²
Contrast Ratio: 900: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 14 pcs EEFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
BBK LT3215S LCD TV with LC320WX3 LCD, 32 ”(81 cm) diagonal, 16: 9 aspect ratio. 500 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. The ratio of maximum brightness to minimum (contrast) is 1100: 1. It is possible to view images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standard ah 480i, 480p, 576i, 576p, 720p, 1080i.
The power of the sound speaker system is 12 W (2x6 W). The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, S-Video, component, SCART x2, RGB, VGA, HDMI x2, coaxial. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024.
The power consumed by the TV in the operating mode from the network is 165 watts.
Overall dimensions: 820x628x240 mm.
TV mass: 20 kg.
Attention! The BB3 LT3215S LCD TV panel LC320WX3 (SL) (C1) is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!
