Technical description and composition of the TOSHIBA 40XF355D TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 40XF355D
Chassis / Version: XF350
Panel: LTA400HT-LH4
T-CON: 404652FHDSC2LV0.2 Code: SJ-75012988
Inverter (backlight): SSI400HA22 REV0.7 -LJ97-01239B
PWM Inverter: SEM2006
MOSFET Inverter: AP4525GEH
Power Supply (PSU): PE0282 V28A00052901, PE0428A sj-75009053
PWM Power: STR-Z4569, STR-W6765
MainBoard: PE0406 V28A000527A1, SJ-75009209 PE0422A
Tuner: SJ-75009070 PE0284B
Appearance
TOSHIBA 40XF355D
General recommendations for repairing TV LCD
Repair of the TOSHIBA 40XF355D TV is best started with a thorough external inspection and diagnosis of the malfunction. It is advisable to carefully examine the internal and external components. Visible damage to elements can sometimes suggest further directions for finding a defect before starting the necessary measurements. 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.
In the absence of any signs of operability, when the TOSHIBA 40XF355D does not turn on and does not signal anything with the control lights on the panel, the power module PE0282 V28A00052901, PE0428A sj-75009053 is most likely to be faulty. 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.
In most cases, a breakdown of the N-Fet converter key does not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM chip from the manufacturer.
Diagnostics of power modules with a Power Factor Corrector (CMC) is somewhat more complicated and requires a more detailed approach.
If the TOSHIBA 40XF355D does not have an image, but there is sound and the TV is controlled by the remote control, a malfunction in the display backlight nodes is likely. The lamps or the power converter - inverter may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the inverter, and check the LCD lamps by connecting external and obviously serviceable for diagnosis to the connectors.
When repairing the SSI400HA22 REV0.7 -LJ97-01239B inverter, it is often necessary to disable the protection for diagnostics, which, for fire safety reasons, turns it off in any emergency situation, for example, during a malfunction or uneven wear of the lamps, which makes it difficult to find a defect.
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.
The motherboard PE0406 V28A000527A1, SJ-75009209 PE0422A must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up constantly. In such cases, if the power supply circuits of the microcircuits are working, a software update may be necessary.
In the absence of tuning to local television channels, you should make sure that the voltage of the varicaps (30-33V) and other supply voltages on the terminals of the tuner PE0284B sj-75009070 are present.
Attention to the owners! Attempts to repair the TOSHIBA 40XF355D TV independently are not recommended by the manufacturer and can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> 40/46XF350PR PE0282 PE0428 PE0406 PE0422 PE0400
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> 40/46XF355D PE0284 PPE0400 PE0401 PE0406 PE0422 PE0473
The appearance of MainBoard PE0406 is shown in the figure below:PE0406
PE0406 can be used in TVs:
TOSHIBA 40XF350PR (Panel LTA400HT-LH4), TOSHIBA 40XF355D (Panel LTA400HT-LH4), TOSHIBA 46XF350PR (Panel LTA460HT-LH3).
The appearance of the power supply
Key Features of the TOSHIBA 40XF355D:
Installed matrix (LCD-panel) LTA400HT-LH4.
The matrix control uses the Timing Controller (T-CON) 404652FHDSC2LV0.2.
The SSI400HA22 inverter is used to power the backlight lamps, it is controlled by the PWM controller SEM2006. As power elements of the inverter, keys of the AP4525GEH type are used.
The necessary supply voltages for all nodes of the TOSHIBA 40XF355D TV are generated by the PE0282 power module or its analogs using the STR-Z4569, STR-W6765 microcircuits.
MainBoard - the main board (motherboard) is a PE0406 module.
The tuner SJ-75009070 PE0284B provides reception of television programs and tuning to channels.
Information from an alternative source:
TOSHIBA 40XF355D
Panel Type (Matrix): SAMSUNG LTA400HT-LH4, MAIN: PE0406 V28A000527A1, TUNER: PE0284B sj-75009070, SIGNAL: SJ-75009209 PE0422A
T-con: Part No: 404652FHDSC2LV0.2 Code: SJ-75012988, LOWER B: PE0428A sj-75009053
Invertor: Part No: SSI400HA22 REV0.7 -LJ97-01239B
PSU: Part No: PE0282 V28A00052901
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA400HT-LH4
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive
Display Colors:, CIE1931 92%
Frequency: 60Hz
Lamp Type: CCFL