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Re: Daewoo 27'' TV
Many times the power supply or the high voltage board is the culprit with this tv. Though instead of spending the money to buy a new part and fix this, I would recommend upgrading to a newer LCD tv since they are fairly cheap. Is there anything clicking or anything at all that you can add to help narrow down the problem.
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Have you checked voltage and ground, anywhere? Make sure battery has a full charge and connections all good, check fusible links where applicable. Not only check applicable fuses, check fuse circuit for voltage, use a test lite.
Usually two voltage circuits at the starter motor, one comes from the battery, hot all the time. The other goes hot with key in the crank position, and may be wired through a relay and safety switch, depending on the tranny. The starter motor usually grounds through the engine block.
Any testing at the starter motor, make sure tranny is in park or neutral and parking brake is set.
I don't know your year--make--model?
Power flows from Fuse 35 50A to IGN switch. Start by checking that fuse. From IGN switch to starter on black/white wire. Check for battery voltage on that wire at starter. If no voltage, check for voltage on black/white wire at IGN when turned to START. If no voltage, check for good power coming into the IGN switch on the the white wire from Fuse 35
If all the parts you replaced are known to be good, then you will need to get a voltage meter and start checkin where the power stops at. Check both sides of the fuse to make sure your getting power to the fuse and to make sure it is good, the on to the relay, if it clicks when the key is turned on then it is good or on some models you can swap the horn relay to double check to make sure it is good, if your relay is clicking then check the wiring to the pump itself and locate where the voltage stops. You might very well have break in the wire to the pump or a bad ground on the pump itself.
you need to check the voltage output of your power supply section.This power supply supply is a switching type power supply.there is a chopper transformer in there.its supply is a dc voltage unlike any other transformer which is AC supplied on the primary..First step. 1.Using a multitester measure the primary supply it is a DC voltage around 220v - 110 VDC 2.Measure the secondary output.The out put is AC voltage the supply for the B+ going to plyback is 115vdc the second output is 12v run through a regulator and the regulator lower the voltage to 5vdc.this 5vdc supplies the system IC and the jungle IC.this ic process the switching of the plyback transformer and the plyback transformers output supplies the voltage of the whole system including your relay in the degaussing section....once the plyback is activated the tv will now turn on...
it could be the power relay trying to latch during startup,it could be a leaky high voltage capacitor or high voltage diode leaking or a magnetron tube starting to draw a high amount of current,the cap and diode would only be starting to leak,because if either were shorted the internal ceramic safety fuse would blow
unplug the unit for 24 hours and try it again. if the unit doesnt come on at all, even after that, then the internal fuse is blown, or a power spike / surge has friend part of the internal power supply. you'll have the go through the warranty process of the manufacturer, or find a local tv repair shop.