TV repair TOSHIBA 32AV933RB
General recommendations for repairing TV LCD
Repair of TOSHIBA 32AV933RB, 32AV934RB must begin with fault diagnosis and a careful inspection of its external and internal components, including the housing ones.
In some cases, visible external damage to elements can suggest directions for troubleshooting and localizing the defect before starting the necessary measurements at control points of electronic circuit components. In some cases, faulty elements are visible to the naked eye, for example, charred resistors or swollen cermet capacitors, or electrolytic ones in rectifier filters. The resulting ring cracks in the soldering of transformer terminals or heating circuit elements are also frequent sources of many malfunctions with a wide variety of external manifestations. If TOSHIBA 32AV933RB, 32AV934RB does not turn on, no indicator lights on the front panel are lit or blinking, therefore, there is a very high probability that the DPS-140SP power module is faulty. Diagnosis of the power supply should always begin with checking the fuse and, if it breaks, you must first check the diodes of the rectifier bridge and the K6A60DR power switch for the possibility of avalanche or thermal breakdown. It should be remembered that N-FET switches used in flyback converters extremely rarely fail for no reason, which must be looked for by checking other elements of the circuit. Often a breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by broken resistors in stabilization circuits. The PWM controller chip DDA010 (8), P1216 can also be the cause of breakdown of the converter power switch. When using a power factor correction unit (PFC) in power modules, troubleshooting becomes somewhat more complex and requires additional experience and knowledge of how they operate.
In cases where the TOSHIBA 32AV933RB, 32AV934RB TV has lost the image, but there is sound and all other functions are working, there is a possibility of a malfunction of the inverter (the converter for powering the backlight lamps). When you turn on the TV, the image may appear briefly and immediately disappear. It is necessary to take into account that with such manifestations the lamps themselves also fail, the malfunction of which can be identified by replacement, connecting for diagnostics into connectors that are known to be good and suitable in power. Diagnostics of the 6632L-0626A LC320WXN inverter can be difficult due to the activation of protection, which is organized by the designers to prevent negative consequences or fires in emergency cases, for example, in the event of short circuits or breaks in the power supply circuit of the lamps, as well as their possible depressurization. To make the necessary measurements at control points or take the necessary oscillograms, repairmen have to block the protection circuits in order to make diagnostics possible. In these cases, special care must be taken due to the risk of failure of the power elements. After completing all repair work, it is imperative to restore the protection circuits for full and safe further operation of the TV by the user.
Motherboard 75031643 (=75030330) 32AV933 rev 1.02 must be checked if there is no response to the remote control and function buttons, the standby indicator blinks or is constantly on. In such cases, if the power stabilizers of the microcircuits are working properly, a software update may be necessary. In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - MSD3704PX-LF-VW, TAS5707, 4435GH, TPA6132A2RTER_4VIA AIVI TI 221 AJ6Q, MX25L6406EM2I-12G with new or known good ones. Before replacing the TDTK-G641D tuner, if there is no channel tuning, you must first check the tuner supply voltage at the corresponding pin.
Typical chassis defect 32AV933: The TV does not enter operating mode, the red indicator on the panel lights up, the message DO NOT POWER OFF SCAN appears and the scanning scale is upside down. The scan goes from 0 to 100% and starts again from 0%. After 100% everything repeats again in a circle. Replacing the software from the official website via USB does not help. Replacement of SPI FLASH 25Q64 is required. The firmware for the LC320EXN(SE)(A1) panel was taken from the remont-aud-net website. The SPI FLASH chip from Winbond must be replaced with a new one.
Attention users! Self-repair of the TOSHIBA 32AV933RB, 32AV934RB TV without the appropriate qualifications and experience can lead to its complete irreparability!
TV repair TOSHIBA 32KL933R
General recommendations for repairing TV LCD LED
Repairing a TOSHIBA 32KL933R TV should begin with fault diagnosis, which involves a careful inspection of the external and internal elements of the device.
Often, based on certain external signs, it may be possible to draw certain conclusions about the reasons for the failure of certain circuit elements even before the necessary measurements are taken, which will make it possible to determine a further algorithm for troubleshooting and localizing the defect. If charred resistors, swollen electrolytic or metal-ceramic capacitors, ring cracks in the solder leads of transformers or heating elements are found, it is advisable to establish the causes and consequences of the malfunction, as well as check the associated elements and assemblies. If the TOSHIBA 32KL933R does not turn on, no indicator lights on the front panel are lit or blinking, therefore, there is a very high probability that the 17IPS19-3 power module is faulty. In some cases, only the processor power regulator may be faulty. In the absence of swollen filter capacitors of the secondary rectifiers, diagnostics of the power supply should begin by checking the fuse and, if it breaks, it is necessary first of all to check all power semiconductor elements of the primary circuit - diodes and transistors for the possibility of avalanche or thermal breakdown. It should be borne in mind that in repair practice it is extremely rare that key transistors in switching power supplies (SMPS) fail for no reason, which should be looked for by checking other components, for example, a breakdown of the key can be triggered by faulty elements of the damper circuits, or dried electrolytic capacitors or dangling resistors of the primary BP circuits involved in the stabilization process. In this case, all semiconductor elements of the ICE3BR0665J (8) PWM regulator microcircuit are subject to testing, which it is advisable to check by replacing it.
If, when you turn on the TV, the image appears and immediately disappears, or is absent initially when turned on, but there is sound and other functions work, there is a high probability of a malfunction of the LED driver (power converter for the LTA320AN12 T01 panel backlight LEDs). In such cases, the general power module must also be checked, in which the electrolytic capacitors of the rectifier filter feeding the LED driver should be checked. To check the serviceability of the LEDs, as well as the contact connections in the ruler circuit, it is necessary to disassemble the panel. To detect a break in the LED strings without disassembling the panel, you will need a current source. It is impossible to open junctions connected in series with a simple multimeter; voltages of several tens of volts are required.
Diagnostics and repair of the 17MB62-2.5 motherboard is carried out by checking the functionality of the stabilizers or power converters of the module chips. In some cases, a software update is required.
If the TV operates normally from external devices, but does not tune in to television channels, the SUT-RE216TN tuner may be faulty. In such cases, first of all, you should make sure that there are supply voltages at the corresponding terminals, as well as power supply for the varicaps (30-33V).
Attention owners! Attempting to repair the TOSHIBA 32KL933R TV yourself is not recommended by the manufacturer and can lead to serious negative consequences!
TV repair TOSHIBA 32DL833R
General recommendations for repairing TV LCD LED
Repairing a TOSHIBA 32DL833R, 32DL834R TV should begin with fault diagnosis, which involves a careful inspection of the external and internal elements of the device.
Often, based on external signs and the nature of damage to elements, it becomes possible to draw some conclusions and determine a further algorithm for searching for a defect before taking the necessary measurements at control points. If charred resistors, swollen electrolytic or metal-ceramic capacitors, ring cracks in the solder leads of transformers or heating elements are found, it is advisable to establish the causes and consequences of the malfunction, as well as check the associated elements and assemblies. If the 32DL833R does not turn on, does not respond to the remote control and front panel buttons, does not blink lights and does not show any signs of operation, the 17PW07-2 power module is probably faulty in this case. If it is in good working order during such manifestations, it is necessary to check the processor power supply stabilizer (converter) on the motherboard. Diagnostics and repair of the general power supply should always begin by checking the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Faulty and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the network rectifier, as well as the large electrolytic capacitor of the network rectifier filter. The reasons for the breakdown of the power switch in switching power supplies (SMPS) can be different, for example, a malfunction of semiconductor elements or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM regulator chip Q211 dezh bp 8pin or breaks in resistors in its wiring.
Sometimes the TOSHIBA 32DL833R TV has no image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the LED backlight converter of the LC320EXN SD A2 led panel, or there may be a break in the LED circuit. In such cases, first of all, you need to make sure that all the electrolytic capacitors of the filter powering the LED driver itself, including the PSU (power supply). Often, if there is no backlight, disassembling the panel is required. It is necessary to check the serviceability of the LED transitions, as well as the reliability of the contact connections in the lines and connectors. To detect a break in the LED strings without disassembling the panel, you will need a current source. It is impossible to open junctions connected in series with a simple multimeter; voltages of several tens of volts are required.
Motherboard 17MB60-4.1 20567221 75025776, DVD 75026264 must be checked if there is no response to the remote control and function buttons, the standby indicator blinks or is constantly on. In such cases, if the converters or power stabilizers of the microcircuits are working properly, a software update may be necessary. Complex repairs of MB (SSB) are possible only in a service center if the necessary equipment is available. Checking or replacing elements RT8293AH (8), TPA3113D2, 4558CM, 9EBG 449 (6) requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can be diagnosed using the heating method. Before replacing the DTOS403LH122E tuner, if there is no channel adjustment, you must first check the supply voltage at its terminals, including the power supply to the varicaps (30-33V).
We remind users once again! Attempts to independently repair the TOSHIBA 32DL833R TV without the appropriate qualifications and experience can lead to its complete irreparability!
TV repair TOSHIBA 32AV833RB
General recommendations for repairing TV LCD
It is advisable to begin any repair and diagnostics of the TOSHIBA 32AV833RB TV with a careful external inspection of internal and external elements, including case parts, display, buttons and cables.
Any external damage can sometimes prompt the repairman to take further steps to determine the malfunction of the TV and localize the defect. Ring cracks in the solder leads of heating elements, swollen electrolytic capacitors, a charred layer of paint on resistors - all this can be a clue for a repairman in making assumptions about the causes and consequences of a malfunction. Malfunctions of the power module PE3131-02UN-LF 75025188 // DPS-135JP A 75025189 DPS-92CP can be expressed in different ways, for example, the TOSHIBA 32AV833RB does not turn on at all and the indicator lights on its front panel do not light up or blink, there are no signs of operability. When diagnosing and repairing a power supply, first of all you should check the fuse and, if it is broken, you need 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 K6A60D K10A60DR. As a rule, the keys of flyback converters, which are used as an N-Fet field-effect transistor on a separate radiator, or integrated with the A6069H PWM controller deja FSFR1800 main // DDA010 (8), DDA014 (SSC9502?) (18), NCP1608 (8) into a single microcircuit, are quite reliable and rarely fail without reason. The reasons for the breakdown of the key should be sought by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is checked by replacing it with a known good one. Diagnostics of power modules with a Power Factor Corrector (PFC) is somewhat more complex and requires a more detailed approach.
If the TOSHIBA 32AV833RB does not have a picture, but there is sound and the TV is controlled from the remote control, there is likely a malfunction in the display backlight units. 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, you need to make sure that the electrolytic capacitors of the rectifier filter that powers the inverter are in good condition, and check the LCD lamps by connecting external ones that are known to be good for diagnostics. In most cases, diagnosing and repairing the LC320WXN 6632L-0626A inverter is difficult due to the organization of protection, which turns it off in emergency situations to avoid fires due to short circuits or breaks in high-voltage circuits and depressurization of lamps. Often, repairmen block the protection circuits in order to make the necessary measurements at the inverter control points to identify the causes of the 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 diagnostics. After repair, it is necessary to restore all standard protection circuits of the converter.
Diagnostics and repair of the 32AV833 REV1.03 motherboard is carried out by checking the functionality of power stabilizers or updating the software. Complex repair of the MB (SSB) board is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace elements TAS5707L, 25Q64CVSIG, MSD3704PX-LF-SA, FA1EA, G61MB. If the TV works normally from external devices, but does not tune in to television channels, the TDTK-G641D tuner may be faulty. In such cases, first of all, you should make sure that there are supply voltages at the corresponding terminals, as well as power supply for the varicaps (30-33V).
Attention owners! Attempting to repair the TOSHIBA 32AV833RB TV yourself is not recommended by the manufacturer and can lead to serious negative consequences!
TV repair TOSHIBA 19EL934RB
General recommendations for repairing TV LCD LED
Repairing a TOSHIBA 19EL934RB TV should begin with fault diagnosis, which involves a careful inspection of the external and internal elements of the device.
Based on visible changes in the state of components, it is usually possible to determine the further direction of troubleshooting and localization of the defect before carrying out the necessary measurements. In some cases, faulty elements are visible to the naked eye, for example, charred resistors or swollen cermet capacitors, or electrolytic ones in rectifier filters. The resulting ring cracks in the soldering of transformer terminals or heating circuit elements are also frequent sources of many malfunctions with a wide variety of external manifestations. Sometimes the TOSHIBA 19EL934RB TV simply does not turn on. No indicator lights on the front panel light up or blink, 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 the failure of the common power supply module DPS-30SP. If it is working, you need to check the processor batteries on the SSB (Main Board). In general, first of all it is necessary to check the electrolytic capacitors of the secondary rectifier filters and the fuse at the mains input. If it is broken, you should then check for breakdown of the PN junctions the diodes of the rectifier bridge and the key transistor of the converter, which can be located either on a separate radiator or integrated with a PWM controller into a common microcircuit. Options are possible. It should be remembered that in repair practice, usually power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the reason that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or broken resistors in the primary circuit, or the PWM controller chip itself may be faulty. It is also necessary to check all semiconductor elements of the stabilization circuit in the primary and secondary circuits.
If, when you turn on the TV, the image appears and immediately disappears, or is absent initially when you turn it on, but there is sound and other functions work, there is a high probability of a malfunction of the LED driver (the power converter for the backlight LEDs of the LC185EXE-TEA1 panel). In such cases, the general power module must also be checked, in which the electrolytic capacitors of the rectifier filter feeding the LED driver should be checked. To check the serviceability of the LEDs and contact connections in their power supply circuit, it is necessary to disassemble the panel. It should be remembered that it is not possible to determine a break in LED lines without disassembling the panels using a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once may require a voltage of several tens of volts.
Repairing the 32AV933 motherboard must begin with diagnosing and checking all linear stabilizers or power converters of its microcircuits. Sometimes a software update may be required - flashing FLASH or EEPROM. When repairing the MB board, you need to check its components MST3704PX-LF-VW, TAS5707L. Defective elements should be replaced. If BGA chips are installed, their failure is usually localized by warming up. If chips with BGA soldering technology are used, problems in its implementation are detected by local heating of the chip. If you suspect a malfunction of the TDTK-G641D(U) tuner, first of all you need to make sure that there is a supply voltage for the varicaps (30-33V) at the corresponding pin of the tuner, as well as other voltages supplying it.
Typical defect of the motherboard 32AV933 : The TV does not enter operating mode, the red indicator on the panel lights up, the inscription DO NOT POWER OFF SCAN and the scanning scale appear upside down. The scan goes from 0 to 100%, then starts again at 0% and everything goes in a circle. Replacing the software from the official website via USB does not help. Replacement and flashing of SPI FLASH 25Q64 is required. Firmware options are included. The SPI FLASH chip from Winbond must be replaced with a new one.
Attention! Users and owners of 19EL934RB TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from attempting independent repairs in order to avoid negative consequences that may lead to complete irreparability of the device.
