Technical description and composition of the TOSHIBA 42A3000PR TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 42A3000PR
Panel: LC420WX7-SLC1 75008814
T-CON: 6870C-0150B LC420WX7
Inverter (backlight): PPW-EE42VT-M 6632L-0450A LC420WX7 & PPW-EE42VT-S 6632L-0451A LC420WX7
Power Supply (PSU): PE0282 V28A00036301
PWM Power: STR-Z4569, STR-W6765
MainBoard: PE0288 V28A000447A1
IC MainBoard: CPU: TC90403FG; Scaler: FLI8541BE
Tuner: ENG37E01GF
Control: Remote: CT-865, IR PE0287A-3 V28A00044803
Specifications 42A3000
TOSHIBA 42A3000PR
General recommendations for repairing TV LCD
It is advisable to start repairing the TOSHIBA 42A3000PR TV with an external examination of all its constituent elements, both internal electronic components and external. Inspection is also subject to body elements, control buttons, screen, connectors and cords. Sometimes, only by some signs can we determine the further direction of the localization of the fault. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
If the TOSHIBA 42A3000PR does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a power module malfunction. In this case, first of all, it is necessary to check the fuse at the input of the network. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the N-FET converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Possible options.
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.
When using the Active Power Factor Correction (CMC) circuitry in the power module, the search for faulty elements is somewhat more complicated.
If the TOSHIBA 42A3000PR has no 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.
Repair of the inverter 75009702 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 to be able to make the necessary measurements at the control points of the circuit.
When disabling protection for diagnostic purposes, it must be remembered that in this case there is a risk of failure of the power elements of the inverter. Upon completion of the diagnosis, all regular protection circuits should be restored.
Attention to users! Independent repair of the TOSHIBA 42A3000PR TV without the appropriate qualifications and experience can lead to its complete non-repairability!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 32A3000P, 37A3000P, 42A3000P, 32A3030P, 37A3030P, 42A3030P. PE0288, PE0282, PE0287, PE0373
1. Service Manuals with Schematic Diagrams 2 of 2007 files on model ------------------> 26A3030D, 26A3000P, 26A3032D, 26A3002P, 32A3030D, 32A3000P, 32A3032D, 32A3002P, 37A3030D, 37A3000P, 37A3032D, 37A3002P, 37A3003P, 42A3030D, 42A3000P, 26A3031D, 26A3001PR
2. Service Manuals with Schematic Diagrams 129 pages on models 26A3030D, 26A3000P, 32A3030D, 32A3000P, 37A3030D, 37A3000P, 42A3030D, 42A3000P
The appearance of MainBoard PE0288 is shown in the figure below:PE0288
PE0288 can be used in TVs:
TOSHIBA 26A3000P (Panel LC260WX2 (SL)(E2) 75007721), TOSHIBA 26A3001PR (Panel V260B1-L01 75008418), TOSHIBA 32A3000P (Panel LC320WX1), TOSHIBA 32A3000PR (Panel LC320W01 (SL)(A1), TOSHIBA 37X3000PR (Panel LC370WU1 (SL)(03)), TOSHIBA 42A3000PR (Panel LC420WX7-SLC1 75008814).
The appearance of the power supply
Main features of the TOSHIBA 42A3000PR device:
Installed matrix (LCD panel) LC420WX7-SLC1 75008814.
The matrix control uses the Timing Controller (T-CON) 6870C-0150B.
To power the backlight used inverter PPW-EE42VT-M.
The necessary supply voltages for all nodes of the TOSHIBA 42A3000PR 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 PE0288 module, using CPU chips: TC90403FG; Scaler: FLI8541BE and others.
The ENG37E01GF tuner provides television reception and channel tuning.TOSHIBA 42A3000 LCD TV with LC420WX7-SLC1 LCD, 42 "(106 cm) diagonal size 16: 9. The ratio of maximum brightness to minimum (contrast) is 1000: 1. You can 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 standards 480i, 480p, 576i, 576p, 720p, 1080i.
The power of the acoustic system of sound 20 W (2x10 W) provide two speakers. 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 x3, component, SCART x2, RGB, VGA, HDMI. 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.
The power consumed by the TV in the operating mode from the network is 241 watts.
Overall dimensions: with stand 1027x725x333 mm, without stand 1027x673x122 mm.
TV Weight: with stand: 24 kg, without stand: 21.5 kg.
Attention! The TOSHIBA 42A3000 LCD TV panel LC420WX7-SLC1 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!