Technical description and composition of the TOSHIBA 32CV500PR TV, panel type and applicable modules. The composition of the modules.Toshiba
Model: 32CV500PR
Panel: LTA320AA03 // LTA320HA02 Rev03
T-CON: 75012986
Inverter (backlight): INV32S12M (75012985) // SSI320-16801
PWM Inverter: OZ9966SN (24)
MOSFET Inverter: AOD486A
Power Supply (PSU): PE0531 (V28A000711B1)
PWM Power: A6169 (8), STR-Z2589, 2A20112 (PFC)
MOSFET Power: P10NK80, 10N60
MainBoard: PE0532 (V28A000710A1)
IC MainBoard: FLI32652H, CXB1444R, STA333W, 0747EFI T5CB5-6UK1 F1789ZAE
Tuner: ENG37E11GF
Specifications 32CV500PR
TOSHIBA 32CV500PR
General recommendations for repairing TV LCD
Repair of the TOSHIBA 32CV500PR must begin with the diagnosis of the malfunction and a thorough inspection of its external and internal components, including the case ones. Often, for certain external signs, the repairman can draw some conclusions about the reasons for the failure of certain elements of the circuit even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. Experienced repairmen are often aware of the causes of the defect and the possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
Sometimes the TOSHIBA 32CV500PR TV simply does not turn on. No control lights on the front panel are lit or blinking, 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 PE0531 (V28A000711B1). In this case, the diagnosis and repair of the common power supply should always be started by checking the mains fuse. When it breaks, it is advisable to check for a breakdown, first of all, all power semiconductor elements of the converter and the rectifier diode bridge of the network, as well as the large electrolytic capacitor of the filter of the network rectifier and the key transistor.
The reasons for the breakdown of the power switch of the flyback converter of the power module 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 controller chip or breakage of the resistors in its bundle.
When using the Active Power Factor Correction (CMC) circuitry in the power module, the search for faulty elements is somewhat more complicated.
If, when you turn on the TV, the image appears and immediately disappears, or is initially absent when you turn on, but there is sound and other functions work, there is a high probability of a malfunction of the inverter (power converter for the backlight). In such cases, the lamps, the inverter and the common power module are subject to verification, in which the electrolytic capacitors of the rectifier filter supplying the inverter should be checked.
Repair of the INV32S12M inverter (75012985) // SSI320-16801 can often be somewhat complicated by the use of special protection circuits that 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 in order to be able to make the necessary measurements at the control points of the circuit.
In such cases, special care should be taken during diagnostics, and after completion of all repair work, it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
In cases of attempts to repair the motherboard PE0532 (V28A000710A1), it is necessary to check the operability of the power stabilizers of the microcircuits and, if possible, update the software (software).
If you suspect a malfunction of the ENG37E11GF tuner, 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.
For owners of 32CV500PR TVs, we recommend that you contact qualified professionals with experience to repair! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 32/37CV500P MAIN PE0532. Service manual and schematic diagram
The appearance of MainBoard PE0532 is shown in the figure below:PE0532
PE0532 can be used in TVs:
TOSHIBA 32CV500PR (Panel LTA320AA03), TOSHIBA 37CV500PR (Panel LC370WXN-SAC1 75011157), TOSHIBA 42CV500PR (Panel LC420WXN-SAB1 75011173), TOSHIBA 42XV550PR (Panel LC420WUN (SA)(A1)), TOSHIBA 32XV550PR (Panel LTA320HA02), TOSHIBA 32XV500PR (Panel LTA320HA02), TOSHIBA 37XV501PR (Panel LC370WUN (SA)(B1)).
PSU Advanced
The 32CV500PR model uses a PE0531 power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, this is a boost converter based on the 2A20112 PWM controller, which eliminates the charge current of the electrolytic capacitor of the rectifier filter directly from the network through open diodes, when its charging current is determined by its reactance.
As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
The appearance of the power supply
Main features of the TOSHIBA 32CV500PR device:
Installed matrix (LCD panel) LTA320AA03 or LTA320HA02 Rev03.
The matrix control uses the Timing Controller (T-CON) 75012986.
The INV32S12M inverter is used to power the backlight, it is controlled by the OZ9966SN PWM controller (24). As power elements of the inverter, keys of the AOD486A type are used.
The necessary supply voltages for all nodes of the TOSHIBA 32CV500PR TV are generated by the PE0531 power module or its analogs using A6169 (8), STR-Z2589, 2A20112 (PFC) microcircuits and P10NK80, 10N60 type power switches.
MainBoard - the main board (motherboard) is a PE0532 module, using chips FLI32652H, CXB1444R, STA333W, 0747EFI T5CB5-6UK1 F1789ZAE and others.
The ENG37E11GF tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA320AA03
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Brightness: 500 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: CCFL
Signal Interface: LVDS (1 ch, 8-bit)
Voltage: 12.0V
Trademark: TOSHIBA, Model: 32CV500PR.
Briefly from the TV: LCD, 32 ", 1366x768, 720p HD, sound: 20W, HDMI connectors: 3.
The composition uses MainBoard PE0532 (V28A000710A1) and an LCD panel (matrix) LTA320AA03, or LTA320HA02 Rev03.
Power Supply Unit (PSU) PE0531 (V28A000711B1) Power Supply.
TOSHIBA 32CV500PR LCD TV with LTA320AA03 LCD display, 32 "(81 cm) diagonal size in 16: 9 format. 500 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. The ratio of maximum brightness to minimum (contrast) is 3000: 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 of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog systems x PAL, SECAM, NTSC. Graphic processing and formation takes place in the digital signal standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p.
The power of the acoustic system of sound 20 W (2x10 W) provide two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x3, S-Video, component, SCART x2, RGB, VGA, HDMI x3. 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, 1280x1024.
The power consumed by the TV in the operating mode from the network is 136 watts.
Overall dimensions: with stand 786x564x247 mm, without stand 786x525x85 mm.
TV Weight: with stand: 15 kg, without stand: 12.1 kg.
Attention! The TOSHIBA 32CV500PR LCD TV panel LTA320AA03 is the most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!