Technical description and composition of the SHIVAKI TV-505D TV, type of panel and applicable modules. The composition of the modules.SHIVAKI
Model: TV-505D
Chassis / Version: JV-V505C-726-MB01
Panel: 5 inch
MainBoard: JV-V505C-726-MB01
IC MainBoard: MST726C-LF P10-100GCP (EN25P10) SA7496LS TDA9886TS
Tuner: XF-5A
Appearance
SHIVAKI TV-505D
General recommendations for repairing TV LCD
It is advisable to start repairing a SHIVAKI TV-505D TV, like any others, with an examination of the internal and external visible physical visual changes. 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. Swollen electrolytic or cermet capacitors, charred resistors, ring cracks in the soldered terminals of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when turned on, there is a certain probability that the power module is defective and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of processor power, but this happens much less often. The diagnostics of the power supply should always be started by checking the fuse and, if it is broken, it is first necessary to check the rectifier bridge diodes and the power switch for the possibility of an avalanche or thermal breakdown.
It should be remembered that the N-FET keys used in flyback converters rarely fail for no reason that must be sought by checking other elements of the circuit. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in the resistors in the stabilization circuits. The PWM controller chip can also cause a breakdown of the power switch of the converter.
If the power module uses an active KKM circuit (power factor control), troubleshooting 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.
When repairing the inverter, it is often necessary for diagnostics to turn off the protection, which, for the purpose of fire safety, turns it off in any emergency situation, for example, during a malfunction or uneven wear of the lamps, which makes it difficult to find a defect.
When diagnosing with the protection off, special precautions must be taken, because there is a risk of failure of the power elements of the inverter. After the diagnosis, it is imperative to restore the protection circuits for the inverter to operate normally.
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 - MST726C-LF P10-100GCP (EN25P10) SA7496LS TDA9886TS which may require replacement with new ones.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
Main features of the SHIVAKI TV-505D device:Installed matrix (LCD-panel) 5 inches.
The required supply voltage for all nodes of the TV SHIVAKI TV-505D provides a switching power supply.
MainBoard - the main board (motherboard) is a JV-V505C-726-MB01 module, using the MST726C-LF P10-100GCP (EN25P10) SA7496LS TDA9886TS and others.
The XF-5A tuner provides TV reception and channel tuning.