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General recommendations for repairing TV LED MAIN BOARD TP.VST59S.P89
Maltifunctions of the power module combined with Mainboard TP.VST59S.P89, can be expressed in different ways, for example, the TV AKAI LEA-32A08G does not turn on at all the control of on the front panel do not light up and blink, there are no signs of operability. Diagnostics and repair of the general power supply should always begin with a check of the mains fuse and the condition of the electrolytic exchange of the filters of the secondary rectifiers network should be replaced with new when the fuse breaks, it is advisable to check for breakdown, in the first place, all power semiconductor elements of the converter and diode bridge rectifier network, as well as a large electrolytic capacitor filter network rectifier
The reasons for the power of a power switch in the circuits of a switching power supply (UPS) may be different, for example, a malfunction of semiconductor cells or electrolytic in in circuits of primary circuit stabilization, as well as failure of the LD7536 PWM Controller or breakage of The Resistors in ITS Strapping
the If there IS NO Image When the AKAI the LEA-32A08G IS turned ON, or IT the Appears and Disappears Immediately, But there IS A Sound, MOST LIKELY A Malfunction in The LC320EXN (SE) Panel the LED (E1 ) LED circuit, or in the driver -converter of their power
Often, if there is no backlight, a panel disassembly is required. It is necessary to check the serviceability of LED transitions, as well as the reliability of contact connections in the rulers and connectors
To detect a break in the LED lines without disassembling the panel, a current source is required. Open transitions connected in series, simple multimeter is not possible, you need a voltage of several tens of volts.
On the motherboard TP.VST59S.P89, in the event of a malfunction, you should first check the operability of all the regulators and power converters of the microcircuits, and update the software (software) if necessary.
In some cases, you need to check or replace (if necessary) the elements of the MB (SSB) board - Cpu: TSUMV59XES-XG, Spi Flash: W25Q32. In cases of using the BGA processor, its malfunction is usually detected by the local warm-up method
Before changing Tuner tuner, if there is no possibility of tuning to TV channels, you should make sure that there are supplies terms that need to be measured at the corresponding tuner terminals and check the software for correctness. Pulses of data exchange between the tuner and the processor can be controlled by an oscilloscope
Attention to users! Self-repair of the TV AKAI LEA-32A08G without proper qualification and experience can lead to its complete non-repairability!
More about repair MainBoard
The motherboard TP.VST59S.P89 is combined with the power module and is a stand-alone device based on the multifunction processor TSUMV59Xxx. Repair of such a card must begin with the verification of the power cells, as well as the performance of the voltage converters and linear stabilizers needed to supply power to certain processor nodes, in particular: the power supply of the core + 1.2V, the built-in DDR + 1.8V memory and the Stand- by ​​3.3V. The supply voltage of the LCD panel 5V, or 12V depending on the type of panel used, must be checked on the LVDS connector.
The mainBoard TP.VST59S.P89 is shown in the figure below:
The main features of AKAI LEA-32A08G:
The matrix (LED panel ) LC320EXN (SE) (E1) has been installed
To power the backlight LEDs, the LED driver with is used, controlled by the PWM controller OB3350CP.
The power supply module is combined with the MainBoard and is designed in accordance with the scheme of the flyback voltage converter AC / DC using the LD7536 microcircuits.
MainBoard - mainboard (motherboard) is a module TP.VST59S.P89, with the use of Cpu chips: TSUMV59XES-XG, Spi Flash: W25Q32 and others
The R620D tuner provides TV reception and channel tuning
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发表于: 2017-9-30 18:10:49
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