Technical description and composition of the TOSHIBA 26AV500PR TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 26AV500PR
Panel: V260B1-L11
Inverter (backlight): VIT70063.50 REV3 75013114
PWM Inverter: OZ964GN (20n) pl
MOSFET Inverter: P4404EDG, P2504BDG
Power Supply (PSU): FSP132-4F02
PWM Power: A6251M (7pin Standby), L6599D (PWM Resonant), 1606B (PFC)
MOSFET Power: K3562
MainBoard: STM26 75012377 PC BOARD ASSY, MAIN, 26AV500P, 39C00W51L05
IC MainBoard: MST98981CLD-LF 432A-2CL1 (EEPROM) TDA8932BTW (VLF) EM6A9160TS-4G (RAM)
Tuner: 3139 147 226416 FQ1216ME / I
Control: IR: STV37TH VTV-IR3705 454C0251L01
Specifications 26AV500
TOSHIBA 26AV500PR
General recommendations for repairing TV LCD
TOSHIBA 26AV500PR TV, like any other, it is advisable to start repairing it by inspecting the internal and external visible physical visual changes. Many visible signs make it possible to determine the future direction of troubleshooting and localization of the defect. 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.
If the TOSHIBA 26AV500PR does not turn on, no control lights on the front panel are lit or blinking, therefore, there is a very high probability of a failure of the FSP132-4F02 power module. When diagnosing and repairing the FSP132-4F02 power supply unit, it is first necessary to check the fuse, and if it breaks, the power switch K3562 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 reason may be a malfunction of the PWM controller chip A6251M (7) dezh L6599D (16) main 1606B (8) prk, which can only be checked by replacing 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 26AV500PR 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.
Diagnosis and repair of the inverter is often complicated by the organization of special protection circuits, which is necessary for fire safety and turns off the inverter in any emergency situation, for example, when the lamps are worn or depressurized. Often, to localize a defect, its blocking is required.
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.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software). In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its chips MST98981CLD-LF 432A-2CL1 (EEPROM) TDA8932BTW (ULF) EM6A9160TS-4G (RAM) and other possible faulty components.
If you suspect a malfunction of the tuner 3139 147 226416 FQ1216ME / I, first of all, you need to make sure that the voltage of the varicaps (30-33V) is present on the corresponding output of the tuner, as well as other voltage supplying it.
Attention to users! Self-repair of the TOSHIBA 26AV500PR TV without the appropriate qualifications and experience can lead to its complete non-repairability!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 26AV500P STM26 VTV-L26002
Service Manual 35 pages of 2008 on models 19AV500PG, 19AV500PR, 19AV500PB, 19AV501PG, 19AV501PR, 26AV500PB, 26AV500PG, 26AV500PR, 19AV505DB, 19AV505DG, 19AV506DB, 19AV506DG, 26AV505DB, 26AV505DG.
The appearance of the MainBoard STM26 is shown in the figure below:STM26
PSU Advanced
On the 26AV500PR TV, the FSP132-4F02 power module is installed using the PFC (Power Factor Correction) scheme acting as an active filter to eliminate the higher harmonic components of the current consumption. The step-up converter based on the 1606B PWM controller does not allow the input rectifier filter's electrolytic capacitor to be connected to the network directly through open diodes, when the reactance (about 15-30 ohms at a frequency of 50 Hz) determines the charge current. As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current will repeat the phase and shape of the sine wave of the input voltage. The health check of the PFC unit is carried out by measuring the DC voltage on the capacitor of the rectifier network. In operating mode, it should be around 380V, in standby approximately 300V.
Main features of the TOSHIBA 26AV500PR device:
Installed matrix (LCD panel) V260B1-L11.
To power the backlight, an inverter VIT70063.50 is used, it is controlled by a PWM controller OZ964GN (20n), pl. As power elements of the inverter, keys of the type P4404EDG, P2504BDG are used.
The required supply voltages for all nodes of the TOSHIBA 26AV500PR TV are generated by the FSP132-4F02 power supply module or its analogs using A6251M (7pin Standby), L6599D (PWM Resonant), 1606B (PFC) microcircuits and K3562 type power switches.
MainBoard - the main board (motherboard) is an STM26 module, using microchips MST98981CLD-LF 432A-2CL1 (EEPROM) TDA8932BTW (ULF) EM6A9160TS-4G (RAM) and others.
Tuner 3139 147 226416 FQ1216ME / I provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CMO
Model: V260B1-L11
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.2M (6-bit + FRC), CIE1931 72%
Response Time: 3/5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 5 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
TOSHIBA 26AV500 LCD TV with V260B1-L11 LCD, 26 "(66 cm) diagonal size 16: 9 format. 500 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. Maximum brightness to minimum ratio (contrast) ) is 800: 1. Dynamic contrast ratio of 30000: 1 is achieved by special control of the backlight. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard for 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 the standards 480i, 480p, 576i, 576p, 720p, 1080i.
The power of the speaker system of sound 14 W (2x7 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 x2, audio x4, S-Video, component x2, HDMI x2, RS-232. 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.
A digital tuner is capable of receiving television channels in DVB-T standards.
Overall dimensions: with stand 676x518x274 mm, without stand 676x478x120 mm.
TV Weight: with stand: 12.3 kg, without stand: 11.4 kg.
Attention! The TOSHIBA 26AV500 LCD TV panel V260B1-L11 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!