Technical description and composition of the TOSHIBA 37AV500PR TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 37AV500PR
Chassis / Version: 32AV500
Panel: AX094B002B
T-CON: MKD 336V-0 n 19100057
Inverter (backlight): MPF3003, PCPF0208 79A
Power Supply (PSU): PE0513A - V28A000677B1
PWM Power: PWM
MainBoard: PE0484 A-1, V28A000628F1
IC MainBoard: TDA8891H1 / N1B, TDA15451HV / N1B00, TDA15451, LPC924F, TL2417
Tuner: TAEA-G081D
Control: IR: PE0486A V28A000642C1
Specifications 37AV500PR
TOSHIBA 37AV500PR
General recommendations for repairing TV LCD
Any repair usually begins with an external inspection. Sometimes, based on visible changes in the components of the device, it is possible to draw some conclusions and determine the direction of further troubleshooting even before the necessary measurements are taken. In most cases, the repairman can guess the causes of the defect and possible consequences by the characteristic signs of typical TV defects, for example, ring cracks formed in the soldering of element leads, swollen rectifier filter capacitors, charred resistors and other circuit elements.
If the TV does not turn on, no control lights are on or blinking, there are no sounds when you turn on, and there is not the slightest sign of operability - the most likely malfunction is in the power module. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and the electrolytic capacitors of the filters of the converter secondary rectifiers. In the event of a fuse breaking, the reason should be sought in the power semiconductor elements of the pulse converter of the main power supply. First of all, it is necessary to check the diodes of the rectifier bridge of the mains voltage and the power key (s) of the converter. The complete inoperability of the power supply unit can be caused by a short circuit in the power elements in the primary circuit, followed by an open fuse, or a short circuit in the loads.
As a rule, the keys in switching power supplies (SMPS) are reliable enough and rarely fail for no reason to be looked for by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
If there is no image when you turn on the TOSHIBA 37AV500PR, or it appears for a second and disappears completely, but there is sound, most likely either the backlight lamps or their power converter (inverter) are faulty. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit. When disabling protection in order to enable the diagnosis of a malfunction, special care should be taken, 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.
The motherboard PE0484 A-1, V28A000628F1 is subject to verification if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up constantly. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary. Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements TDA8891H1 / N1B, TDA15451HV / N1B00, TDA15451, LPC924F, TL2417. BGA chip malfunctions are usually easy to detect by warming up.
If there is no reception of television channels, but the TV is working properly from external devices, first of all you need to check the voltage of the tuner TAEA-G081D and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
It is necessary to remember to users that attempts to self-repair a TOSHIBA 37AV500PR TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 32AV500PR. PE0484 PE0486 PE0531 PE0640
The appearance of MainBoard PE0484 is shown in the figure below:PE0484
PE0484 can be used in TVs:
TOSHIBA 32AV500PR (Panel LC320WXN (SB)(B1)), TOSHIBA 32AV500PSR (Panel LC320WXN (SB)(B1)), TOSHIBA 32AV501PR (Panel LK315T3LA31), TOSHIBA 32AV502PR (Panel LK315T3LA31 (75012574)), TOSHIBA 37AV502PR (Panel LC370WXN(SA)(C2) 75012583), TOSHIBA 42AV500PSR (Panel LC420WXN (SA)(B1)), TOSHIBA 42AV501PR (Panel LC420WX7-SLC1), TOSHIBA 42AV502PR (Panel LC420WXN-SAB1), TOSHIBA 37AV500PR (Panel AX094B002B).
The appearance of the power supply
Main features of the TOSHIBA 37AV500PR device:
Installed matrix (LCD-panel) AX094B002B.
The matrix control uses the MKD Timing Controller (T-CON).
The MPF3003 inverter is used to power the backlight.
The necessary supply voltages for all nodes of the TOSHIBA 37AV500PR TV are generated by the PE0513A power module or its analogs using PWM microcircuits.
MainBoard - the main board (motherboard) is a PE0484 module, using TDA8891H1 / N1B, TDA15451HV / N1B00, TDA15451, LPC924F, TL2417 and others.
The TAEA-G081D tuner provides TV reception and channel tuning.
TOSHIBA 37AV500PR LCD TV with AX094B002B LCD, 37 "(94 cm) diagonal display in 16: 9 format. Screen brightness of 500 cd / m² is provided by CCFL (EEFL) fluorescent lamps. The ratio of maximum brightness to minimum (contrast) is 850: 1. Dynamic contrast ratio of 14000: 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 an analog system x PAL, SECAM, NTSC. Graphic processing and digital signal generation takes place in the standards 480i, 480p, 576i, 576p, 720p, 1080i.
The power of the sound system 20 W (2 x 10 W) provides 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, HDMI x2. An output for connecting headphones is provided.
The power consumed by the TV in the operating mode from the network is 164 watts.
Overall dimensions: with stand 913x619x247 mm, without stand 913x579x107 mm.
TV Weight: with stand: 16.2 kg, without stand: 14.9 kg.
Attention! The AX094B002B panel of the TOSHIBA 37AV500PR LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!