TV TOSHIBA 40LV933RB, like any others, it is advisable to start repairing with an inspection of internal and external visible physical visual changes. Visible damage to the elements can sometimes suggest further directions for searching for a defect before the necessary measurements are taken. Electrolytic capacitors of filters with a swollen case, as well as annular cracks formed in the soldering of the leads of heating elements or a layer of coal on burnt resistors, sometimes tell the repairman the causes of the malfunction and possible consequences.
In the case when the 40LV933RB does not turn on, does not respond to the remote control and front panel buttons, does not blink its lights and does not show any signs of operability, most likely in this case the power module DPS-245FP is faulty. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and, in case of its breakage, the cause should be sought in the power semiconductor elements of the pulse flyback converter of the main PSU. First of all, it is necessary to check the diodes of the mains voltage rectifier bridge and the power switch of the converter, which can be installed separately on the radiator, or integrated with the PWM controller.
If a breakdown of the power switch of the flyback converter of the power supply is detected, it should be remembered that it does not fail without reasons that should be looked for by checking other elements of the primary circuit - electrolytic capacitors, PWM controller DDA010 (8), 1608B (8), S101 (6), DDA014 (18), which can only be checked by replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
When using a power factor correction unit (PFC) in power modules, troubleshooting becomes somewhat more complicated and requires additional experience and knowledge of how they work.
If there is no image when you turn on the TOSHIBA 40LV933RB, or it appears for a second and disappears completely, but there is sound, either the backlight lamps or their power converter (inverter) are most likely faulty. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the common power supply.
The operation of the power circuits of the inverter and backlight lamps in the normal mode is controlled by special protection, which is organized for fire safety purposes, for example, to turn off in case of short circuits or breaks in high-voltage connections or in case of depressurization of lamps. This protection significantly complicates the diagnosis and repair of the inverter.
All necessary precautions must be taken when disabling inverter protection during diagnostics and not left disabled after repair is completed.
When trying to repair motherboard, you should first check the correctness linear stabilizers or microcircuit power converters and, if necessary, update software(ON).
In cases where there is no tuning to local television channels, you should make sure that there is a supply voltage for varicaps (30-33V) and other supply voltages at the outputs of the TDTK-G641D tuner.
Typical motherboard defect:
The TV does not enter the operating mode, the red indicator on the panel is on, the inscription DO NOT POWER OFF SCAN appears and the scanning scale is upside down. Passes from 0 to 100% and scans again from 0%. After 100%, everything repeats again in a circle.
Replacing the software from the official site via USB does not help. Requires replacement and flashing 25Q64.
Firmware options are attached, taken from the site remont-aud-net.
The Winbond SPI FLASH chip must be replaced with a new one.
It should be remembered! Attempts to repair the TOSHIBA 40LV933RB 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-repairability of the device!
The service menu allows you to access TV settings that are not included in the regular OSD menu. In addition, it allows you to perform some service operations for testing the operation of the central microcontroller, through which all the main functions of the TV are controlled. Each manufacturer uses its own algorithm for enabling such a menu - below is the required sequence of actions for Toshiba TVs.
Instruction
Turn on the TV using the power-on button on its body and wait for the image to appear on the screen. You will need a remote control for the next steps. remote control- take it, but do not go far from the TV, as the controls located on its body will also be involved in the operation.
Start with the remote control - the first action in the sequence should be to press the mute button on it. This button is marked mute on the body of the remote control and is located on the right in the first row of the lower button section. Depending on the model of the remote control device and the TV itself, the function of this button may be combined with the command to switch to next page teletext and have the inscription page+.
Press the same button again, but this time do not release it.
Press the on-screen menu entry button on the TV while holding down the mute key on the remote control - this button should be labeled accordingly (menu). If the Toshiba model you are using does not have such a button on the TV case, then look for a small hole on it, behind which there is a microswitch. This control can also be labeled menu. Press the microswitch with any improvised means - a match, a toothpick, a hairpin, a needle, etc.
An indication that the TV service menu is activated should be the appearance of the letter S in the right upper corner TV screen. When the work in the service menu is completed, to exit it, use the power-off button on the TV case.
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Chassis 11AK53-3 29VH36GTo enter the service mode, it is necessary to enter the main menu (MAIN MENU) in the operating mode and enter 4, 7, 2, 5.
Toggle items "?/ ?", confirmation "?" Entering VG2 STATUS "OK".
Exit - "M".
Chassis C7SS 28W7D Proc. TMP87CS38N-3477
POWER OFF output
Chassis PD1563 21CSZ2R percent MN101EO4GAC, 338U1M87, Algista8
Chassis S3E 21CS1R Proc. 8801CPCNG4V63
Press the (MUTE) button on the remote control. Press it again and while holding press (MENU) on TB.
POWER OFF output
Chassis S3ES 21SZ2E, 21SZ2ES, 21SZ2T, 21SZ2M, 21SZ2MJpercent MN101E04G, MN101E02HME ALGISTA 8
Press the (MUTE) button on the remote control. Press it again and while holding press (MENU) on TB.
POWER OFF output
Chassis S5E C6S 2050 2150, 1478XR, 1450, 1458, 20N3 2163DB/DD/DF/DN/DS Proc. M3722M6-A80SP/A81SP/B80SP/B84SP
1. on the remote control (MUTE)
2. Press (MUTE) again and do not release
3. Press (MENU) on TV
On TV, where there is no MENU button, there is a small hole in front in which the desired button is to press a match.
Turning on the test signal: In the service mode, press => on the remote control.
Activation of the self-diagnosis function: In the service mode, press (9) on the remote control. The self-diagnosis menu will open and everything is clear there.
Memory initialization: In service mode, press (CALL) and (CHANELL) at the same time
POWER OFF output
Chassis S6E 2160XHC M37222M4-C87SP
Turn on the TV, press MUTE, press a second time MUTE and holding it press MENU on the front of the TV.
S.
Exit - Power off.
Chassis S8E
21G3XHE, 21G3XR
percent TMP87CK38N, video-TB1231CN
Turn on the TV, press MUTE, press a second time MUTE and holding it press MENU on the front of the TV.
A letter should appear in the upper right corner S.
Exit-Power off.
Chassis TMC574A VTD1420percent 195C6PC0 OECF011A, video STV2246H
Entrance from the universal. Entrance to the service volume - and at the same time 6 on the remote control. Options in the form INIT 01 00 second line CRT on 9A4E.
Chassis Yang Sesuai
To enter the service, you must press and release the Mute button, press it again and, while holding, press F on the front panel of the TV.
14A3E/14A3R/14A3M/14A3MJ/14A3H 21A3TR/R/M/MJ percent 87CK38N-3DV8
To enter the service, press and release the Mute button, press it again and, while holding it, press Menu on the front panel of the TV.
15LZR17, 15LZU28X, 21LZM28, 21LZR17, 21LZU17X, 21LZU23X percent 8891CPBNG6JC0
Press the (MUTE) button on the remote control. Press it again and while holding press (MENU) on TB.
POWER OFF output
2185XR, 29AX9UM, 29CVZ6DR
1. Press the button on the remote control (MUTE)
2. Press the (MUTE) button again without releasing it:
3. Press the TV button (MENU) . Each press of the (CHANNEL UP) button changes the adjustment positions. Each press of the (+VOLUME) and (-VOLUME) buttons changes the data. The AV button switches between different setup tables.
Output - turn off TV or MENU
2512-DD
Service: simultaneously press "F" and "AV" on the remote control, then enter the code 1048.
2929DD, 2812DS, 2505DBT, 2805DBT percent CXP80424-144
While holding the button (F) give a command from the remote control (AV).
Then immediately dial (1) (0) (4) (8) When dialing, the numbers 1048 will appear on the screen in white. After a few seconds, the letter M will appear in the right corner. By pressing and holding the button (F) and pressing the button (9), testing will begin.
When you press and hold the button (F) and press the button (2), the screen goes out but there is sound. When you press and hold the button (F), press the button (Z), the TV parameter settings will be displayed from positions 16 to 43 (you need to change the positions by pressing the (z) button. They will increase if you do this with the (S) button, the positions will decrease
POWER OFF output
42AV633DR
Press the (MUTE) button on the remote control. Press it again and while holding press (MENU) on TB.
Output POWER OFF .