Question about Insignia IS-LCDTV32 32 in. Television
When the light is red on off position, and blinking on on position, that means that the TV is in protect mode.
Protect mode is a diagnostic mode that kicks in when a wrong voltage is detected. It can be caused by an internal fault or an external event like a power surge. The protection circuit will start, preventing the TV from turning on and keeping it in stand by, with the led blinking and no raster when TV is on.
If the problem is external, like a power surge, or a short on antenna or receiver connector contacts, for example, the problem is fixed simply leaving the power cord disconnected for one or two hours. On LCD even less, since LCD TVs do not have high voltage circuits, either than the inverter, 15 or twenty minutes are usually enough to drain power completely and reset the protection circuit when there is no internal fault.
If the TV does not reset, then there is an internal fault.
In that case testing will start from PSU, where after a a general observation, as you have already done, the technician will read voltages out using a multimeter. While checking the PSU, it is also worth giving a general look to see if everything is OK, checking connectors, ribbon cables etc. IF PSU is OK, next part to test is the inverter. A first test on the inverter is done reading DC voltages in, and reading high voltage out (with multimeter on AC). A complete test can be done only using an oscilloscope to test the AC section of the inverter circuit. If inverter is ok, the I/O connectors and touch buttons are tested. This is a simple test, using multimeter to check that there is no short on I/O ports, and that no button switch is stuck on close. If still nothing , what remains is the digital control board, that is the main board inside the TV. This is more complicate to test, and for this purpose usually service manual is used. Service manuals for this Insignia had never been distributed, therefore the only options are testing at component level, or replacing main board and taking a risk. Test and repairs must be done by an experienced person aware of the safety risk involved.
Posted on Oct 03, 2009
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Posted on Jan 02, 2017
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