Technical description and composition of the TOSHIBA 32AV703R TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 32AV703R C
Chassis / Version: MST3740EU-T MAIN BD manufactured by UNIHAN
Panel: V315B5-L12 75018968
Inverter (backlight): I315B5-4UE T87I029.26 75021314
PWM Inverter: BD9215FV (28), LM339 (14)
MOSFET Inverter: AOD4184 (3)
Trans Inverter: 4045L 1024L3 KG5N5
Power Supply (PSU): FSP132-3F01 75018688 POWER MODULE, OPENFRAME 132W / + 5, 12, 24V, 0433-002F000
PWM Power: A6069H (7), SSC9512S (18), SSC9502 (18), 1607B (PFC)
MOSFET Power: FQPC5N50C FQPC6N60
MainBoard: MST3740EU-T Rev 1.04
IC MainBoard: MST9A884JL-LF, W9412G6IH-4, MX25L1605DM2I
Tuner: TT2124
Control: CT-90326
Toshiba
Model: 32AV703R K
Chassis / Version: MST3740EU-T MAIN BD manufactured by UNIHAN
Panel: LTA320AP08 75016146 // V315B5-L12 rev.C1
T-CON: LJ94-03120B 75017085
Inverter (backlight): SSI320_4UB01 // LJ97-02149A 75017600 // T87I029.26
PWM Inverter: OZ9966SN (24), A393F (8)
MOSFET Inverter: KM8700DN (8)
Trans Inverter: LT-EU320B U0 1035 C Y
Power Supply (PSU): FSP132-3F01
PWM Power: A6069H (7), SSC9502S (18), 1607B (PFC)
MOSFET Power: 1K40EU FQPF6N60 K4110
MainBoard: MST3740EU-T Rev 1.04
IC MainBoard: MST9A884JL-LF, W9412G61H-4
Tuner: TT2124
Control: Remote: CT-90326, IR: 08E1-06R2200
Specifications 32AV703
TOSHIBA 32AV703R
General recommendations for repairing TV LCD
Repair of the TOSHIBA 32AV703R K must begin with the diagnosis of the malfunction and a thorough inspection of its external and internal components, including the case ones. Many visible signs make it possible to determine the future 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 solders will help the master to guess the causes and possible consequences of the malfunction.
Sometimes the TOSHIBA 32AV703R K does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is a failure of the FSP132-3F01 common power module. When diagnosing and repairing the power supply, first of all, it is necessary to 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 or power switch 1K40EU FQPF6N60 K4110.
Power switches in flyback converters fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The reason may be a malfunction of the PWM controller chip A6069H (7) SSC9502S (18) 1607B (8), which can only be checked by replacing it with a new or obviously working one.
In cases using a power module with an active KKM, troubleshooting is sometimes somewhat more complicated.
If the TOSHIBA 32AV703R K has no image, but there is sound, there is a possibility of a malfunction of the backlight or power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working.
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.
In such cases, special care should be taken during diagnostics, 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 or diagnostics of the 69EB3IM10C09P 75020414 // MST3740EU-T-MAIN motherboard must be started by checking the power conditioners. If necessary, you should update the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - MST9A884JL-LF, W9412G61H-4 and replace failed chips with new ones.
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 only to professionals with sufficient experience in the field of electronic equipment repair.
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 32AV703R. Ver. 2.00 MST3740EU
SCHEMATIC DIAGRAM / psu ------------------> TOSHIBA Power Supply FSP132-3F01
1. Service Manual 51 pages on models 19AV703R, 22AV703R, 26AV703R, 32AV703R, 32LV703R, 37LV703R, 40LV703R, 19AV704R, 22AV704R, 26AV704R, 32AV704R, 32LV704R, 37LV704R, 40LV704R
2. Service Manuals with Schematic Diagrams 73 pages on models 19AV703, 22AV703, 26AV703, 32AV703, 19AV703R, 22AV703R, 26AV703R, 32AV703R, 19AV703G, 22AV703G, 26AV703G, 32AV703G
The appearance of the MainBoard MST3740EU-T is shown in the figure below:MST3740EU-T
MST3740EU-T can be used in TVs:
TOSHIBA 26AV703R (Panel V260B3-L04 RevC1), TOSHIBA 32AV703R C (Panel V315B5-L12 75018968), TOSHIBA 32AV703R K (Panel LTA320AP08 75016146 ), TOSHIBA 32AV704R (Panel V315B5-L12 Rev01 75018968), TOSHIBA 32LV703R A (Panel T315HW04 V.4 (12v) 75018019), TOSHIBA 32LV703R K (Panel LTA320HA04 T01 75016399 (12v)), TOSHIBA 40LV703R C (Panel V400H1-L10 REV C1 75018974), TOSHIBA 40LV703R K (Panel LTA400HM02 T03).
PSU Advanced
In the 32AV703R TV, the FSP132-3F01 power module is installed using the PFC (Power Factor Correction) scheme acting as an active filter to eliminate the higher harmonic components of the current consumption. The boost converter based on the 1607B PWM controller does not allow the input rectifier filter's electrolytic capacitor to be connected to the network directly through open diodes, when the reactance determines the charge current (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 will repeat the phase and shape of the sine wave of the input voltage. The health check of the PFC unit is carried out by measuring the DC voltage on the capacitor of the rectifier network. In operating mode, it should be around 380V, in standby approximately 300V.
The appearance of the power supply
Main features of the TOSHIBA 32AV703R device:
Installed matrix (LCD panel) LTA320AP08 75016146 or V315B5-L12 rev.C1.
The matrix control uses the Timing Controller (T-CON) LJ94-03120B.
The SSI320_4UB01 inverter is used to power the backlight, it is controlled by the OZ9966SN (24), A393F (8) PWM controller. A transformer LT-EU320B U0 1035 C Y is installed in the inverter converter. Keys of the KM8700DN type (8) are used as power elements of the inverter.
The necessary supply voltages for all nodes of the TOSHIBA 32AV703R TV are generated by the FSP132-3F01 power supply module or its analogs using A6069H (7), SSC9502S (18), 1607B (PFC) microchips and 1K40EU FQPF6N60 K4110 power switches.
MainBoard - the main board (motherboard) is an MST3740EU-T module, using the MST9A884JL-LF, W9412G61H-4 microcircuits, and others.
The TT2124 tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA320AP08
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: PVA, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare (Haze 7%), Hard coating (3H)
Brightness: 400 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V