Technical description and composition of the TOSHIBA 42XV600 TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 42XV600 A / DA
Chassis / Version: XV600
Panel: T420HW04 v.4
T-CON: T420HW04 V.0
Inverter (backlight): V291-002
Power Supply (PSU): PE0755 ou V28A00100301
MainBoard: PE0808 ou V28A00107501
IC MainBoard: CPU: TC90415XBG; DRAM: HY5PS121621CFP-Y; NAND Flash: SST39VF800A; EEPROM: AT24C128BN;
Tuner: ENG37E05KF
Appearance
TOSHIBA 42XV600
General recommendations for repairing TV LCD
Like any other TV, TOSHIBA 42XV600 (A) DA repair it is advisable to start with an external inspection of the visible changes in the external and internal elements. Any external damage can sometimes prompt the repairman to take further steps to determine the malfunction of the TV and localize the defect. Experienced repairmen are often aware of the causes of the defect and possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
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, does not make any sounds or any signs of operability when turned on, there is a certain chance that the PE0755 ou V28A00100301 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. When diagnosing and repairing the power supply unit PE0755 ou V28A00100301, first of all, it is necessary to check the fuse, and if it breaks, the power switch and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
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 cause may be a malfunction of the PWM controller chip, 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 42XV600 (A) DA does not have an 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.
Repair of the V291-002 inverter can often be somewhat complicated by the use of special protection circuits, which are designed to disconnect it in emergency cases for fire safety when the lamps are depressurized, or short circuits or breaks in high-voltage circuits and connections. Sometimes it becomes necessary for diagnostic purposes to block the protection circuits in order to be able to make the necessary measurements at the control points of the circuit.
It should be remembered that when the protection is turned off, there is always a risk of failure of the power elements of the inverter during diagnosis. After repair, it is necessary to restore all standard converter protection circuits.
Repair of the motherboard PE0808 ou V28A00107501 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 the TV works normally from external devices, but does not tune into television channels, the ENG37E05KF tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals, as well as the power supply of varicaps (30-33V).
It should be remembered! Attempts to repair the TOSHIBA 42XV600 (A) DA TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-serviceability of the device!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba LCD 32/37/42/46/52XV600DA, LC4244WDA
The appearance of MainBoard PE0808 is shown in the figure below:PE0808
Key Features of the TOSHIBA 42XV600:
Installed matrix (LCD-panel) T420HW04 v.4.
The matrix control uses the Timing Controller (T-CON) T420HW04.
To power the backlight used inverter V291-002.
The formation of the necessary supply voltages for all nodes of the TOSHIBA 42XV600 TV is carried out by the PE0755 power module, or its analogues.
MainBoard - the main board (motherboard) is a PE0808 module, using CPU chips: TC90415XBG; DRAM: HY5PS121621CFP-Y; NAND Flash: SST39VF800A; EEPROM: AT24C128BN; and others.
The ENG37E05KF tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T420HW04 V4
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: AMVA3, Normally Black, Transmissive
Active Area: 930.24x523.26 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: 12 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V