Technical description and composition of the SUPRA STV-LC2662 TV, panel type and modules used. The composition of the modules.SUPRA
Model: STV-LC2662
Panel: V260B1-L01 REV.C1
T-CON: V260B1-C01
Inverter (backlight): I260B1-12C 6 lamps
PWM Inverter: OZ964GN (20)
MOSFET Inverter: AO4614 (8)
Power Supply (PSU): MLT169B - T2
PWM Power: 3843B, OB2268 (SG6841 replacement), L6562 (PFC)
MainBoard: B.TRTD5C 6326LF main B.TRTD5C 6512
IC MainBoard: T5BS4-9999, SVP-CX32, 24C64, SST39VF088, TDA7265, STS 12C4052 dej percent
Tuner: JS-6B2 / 121
Control: replacing IRC-120E with a new (!) Code 118
Appearance
SUPRA STV-LC2662
General recommendations for TV LCD repair
Diagnostics of malfunctions and repair of SUPRA from the chassis, like other electronic devices, is recommended to begin with an external examination of the external and internal elements. Often, based on external signs and the nature of damage to elements, it becomes possible to draw some conclusions and determine a further algorithm for searching for a defect before taking the necessary measurements at control points. Charred paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering on the leads of heating elements or transformers can often suggest the causes of a defect and possible consequences.
In the case when the STV-LC2662 does not turn on, does not respond to the remote control and front panel buttons, does not blink lights and does not show any signs of operability, the MLT169B-T2 power supply module is probably faulty in this case. If it is working properly with such manifestations, it is necessary to check the processor power regulator (converter) on the motherboard. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the mains rectifier, as well as the large electrolytic capacitor of the mains rectifier filter.
The reasons for the breakdown of the power switch in switching power supplies (SMPS) can be different, for example, a malfunction of semiconductor elements or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as the failure of the 3843B, OB2268 PWM controller chip (replacing SG6841), L6562 (8 ) or breaks of resistors in its strapping.
Sometimes the SUPRA STV-LC2662 TV does not have a picture, but there is sound, or the picture appears and disappears immediately. In this case, there is a high probability of a malfunction of the backlight converter, or the lamps themselves, which can be checked by replacing. In such cases, it is necessary to make sure that all electrolytic capacitors of the filter are in good working order for the power supply of the inverter itself, including the power supply unit (power supply unit).
In most cases, diagnostics and repair of the I260B1-12C 6-lamp inverter is difficult due to the organization of protection, which turns it off in emergency situations in order to avoid fires when short circuits or breaks in high-voltage circuits and when lamps are depressurized. Repairers often block the protection circuits to make the necessary measurements at the control points of the inverter to identify the causes of the defect.
On the B.TRTD5C 6326LF motherboard, in the event of a malfunction, you should first check the operability of all stabilizers or power converters of microcircuits and, if necessary, update the software (software). If it is not possible to replace the MB (SSB) board, you need to check the serviceability of its elements - T5BS4-9999, SVP-CX32, 24C64, SST39VF088, TDA7265, STS 12C4052 (dezh percent), tuner JS-6B2 / 121. Defective components must be replaced.
Remember! Attempts to self-repair the SUPRA STV-LC2662 TV by users without appropriate qualifications and the necessary experience can lead to serious negative consequences!
The appearance of the MainBoard B.TRTD5C is shown in the figure below:B.TRTD5C
B.TRTD5C can be applied in TVs:
SUPRA STV-LC2662 (Panel V260B1-L01 REV.C1), SUPRA STV-3268 STV-LC3268 (Panel V320B1-L01 Rev.D1), SUPRA STV-LC4268 (Panel LC420WX3).
Additionally by PSU
In the STV-LC2662 TV, an MLT169B power module is installed using a PFC (Power Factor Correction) circuit that performs the function of an active filter to eliminate the higher harmonic components of the current consumption. The boost converter based on the L6562 PWM regulator does not allow the electrolytic capacitor of the input rectifier filter to be connected to the network directly through open diodes, when the charge current is determined by its reactance (about 15-30 ohms at a frequency of 50 Hz). As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current follows the phase and shape of the sinusoid of the input voltage. Checking the health of the PFC unit is carried out by measuring the DC voltage across the capacitor of the mains rectifier. In working mode, it should be about 380V, in standby about 300V.
External view of the power supply
Main features of SUPRA STV-LC2662 device:
Installed matrix (LCD panel) V260B1-L01 REV.C1.
Matrix control uses Timing Controller (T-CON) V260B1-C01.
To power the backlight lamps, an I260B1-12C inverter is used, controlled by an OZ964GN PWM controller (20). The switches of the AO4614 type (8) are used as power elements of the inverter.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC2662 TV is carried out by the MLT169B power module, or its analogs using 3843B, OB2268 microcircuits (SG6841 replacement), L6562 (PFC).
MainBoard - the main board (motherboard) is a B.TRTD5C module, using T5BS4-9999, SVP-CX32, 24C64, SST39VF088, TDA7265, STS 12C4052 and others.
The JS-6B2 / 121 tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CMO
Model: V260B1-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.2M (6-bit + FRC), CIE1931 72%
Response Time: 3/5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 12 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V