Technical description and composition of the TOSHIBA 40XV550PR TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 40XV550PR
Panel: LTA400HA07
T-CON: SYNC60C4LV0.1
Inverter (backlight): SSI400-16T01
Power Supply (PSU): FSP238-4F03 (PK101V0750I) FSP272-4F02 (PK101V0930I)
PWM Power: 1606B (PFC), STR-A6251M (Standby DIP-7), SSC9502 (PWM resonanr SO-18)
MOSFET Power: K3569
MainBoard: STX40E VTV-L40108
IC MainBoard: CPU: MST99985DLD-LF-1, F25L004A, F25L008A, GT24C32
Tuner: TDAGA4-B03A - RTUDAA019WJQZ // FQ1216ME / IH-5
Control: CT-90298, IR: C 454C0M51L01 (VTV-IR40103)
Specifications 40XV550PR
TOSHIBA 40XV550PR
General recommendations for repairing TV LCD
An external examination of the external and internal elements should be carried out in a timely manner before the start of operations for their dismantling. In some cases, visible external damage to the elements can suggest the direction of troubleshooting and localization of the defect even before the start of the necessary measurements at the control points of the nodes of electronic circuits. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in solders will help the master to guess the causes and possible consequences of the malfunction.
Sometimes the TOSHIBA 40XV550PR 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 a failure of the common power module FSP238-4F03 (PK101V0750I) FSP272-4F02 (PK101V0930I). If it is working properly, you must check the standby batteries on the Main Board. When diagnosing and repairing the power supply, first of all, replace the swollen capacitors of the filter of the secondary rectifiers and check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module — rectifier diodes and K3569 transistors in the primary circuit.
In most cases, key breakdowns in switching power supplies (SMPS) do not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM 1606B (PFC), STR-A6251M (Standby DIP-7), SSC9502 (PWM resonanr SO-18) chips from the manufacturer.
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. If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
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 attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - CPU: MST99985DLD-LF-1, F25L004A, F25L008A, GT24C32 which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
Before changing the tuner TDAGA4-B03A - RTUDAA019WJQZ // FQ1216ME / IH-5, if it is not possible to tune to television channels, make sure that there are supply voltages that need to be measured on the corresponding terminals of the tuner and checked for correctness of the software. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
It should be remembered! Attempts to repair the TOSHIBA 40XV550PR 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 appearance of the MainBoard STX40E is shown in the figure below:STX40E
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the FSP238-4F03 module provides for the use of a Power Factor Correction unit. The PFC circuit is a 1606B PWM boost converter. The reactance of an electrolytic capacitor of a line filter at a frequency of 50-60 Hz is usually not more than 20-30 ohms and its charge directly from the network through open diodes could reach tens of amperes per pulse if no filtering were applied.
As a result of the PFC conversion, an increased voltage on the capacitor (about 380V) cannot directly open the rectifier diodes, on the anode of which the voltage will always be slightly less (about 300V) and then its charging current will always be limited by the elements of the PWM controller. As a result, the envelope of the high-frequency pulses of the consumed current will repeat the shape and phase of the input sinusoidal voltage. The presence of an increased voltage (+ 380V) on the network capacitor indicates the serviceability of the PFC node.
The appearance of the power supply
Key Features of the TOSHIBA 40XV550PR:
Installed matrix (LCD-panel) LTA400HA07.
The matrix control uses the Timing Controller (T-CON) SYNC60C4LV0.1.
To power the backlight used inverter SSI400-16T01.
The necessary supply voltages for all nodes of the TOSHIBA 40XV550PR TV are generated by the FSP238-4F03 power supply module or its analogs using 1606B (PFC), STR-A6251M (Standby DIP-7), SSC9502 (PWM resonanr SO-18) microcircuits and power switches of the type K3569.
MainBoard - the main board (motherboard) is an STX40E module, using CPU chips: MST99985DLD-LF-1, F25L004A, F25L008A, GT24C32 and others.
Tuner TDAGA4-B03A - RTUDAA019WJQZ // FQ1216ME / IH-5 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA400HA07
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 885.6x498.15 mm
Surface: Antiglare (Haze 7%)
Brightness: 430 cd / m²
Contrast Ratio: 4000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 14 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
Brand: TOSHIBA, Model: 40XV550PR.
Short from TV: LCD, 40 ", 1920x1080, 1080p Full HD, sound: 20W, HDMI: 3.
The composition uses the MainBoard STX40E VTV-L40108 and the LCD panel (matrix) LTA400HA07.
Power supply unit (PSU) FSP238-4F03 (PK101V0750I), or FSP272-4F02 (PK101V0930I) Power Supply.
TOSHIBA 40XV550PR LCD TV with LTA400HA07 LCD display, 40 "(102 cm) diagonal size in 16: 9 format. 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. Design and the TV’s technical capabilities include watching broadcasts and films in high quality HD with a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD) .The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. kai 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, 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.
Overall dimensions: with stand 997x684x277 mm, without stand 997x635x96 mm.
TV Weight: with stand: 18 kg, without stand: 16.3 kg.
Attention! The TOSHIBA 40XV550PR's LCD TV panel LTA400HA07 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!