Question about Televison & Video
Re: Samsung lcd tv mod.# LN-S 4051D No power.
I opened up power supply, and replaced four bulging capacitors 10v, 1000uF.
Now when I power it up, red indicator light blinks 4 times, and I still have no power.
First, check for short circuits. More likely that a semiconductor ( let's say a power transistor or diode) is acting like a conductor.
Also, check the inverter board, the part that lights the tube in the display. It may have a short circuit.
Transistors and diodes are easy to determine if it have a short circuit or if it's open, there is no need to remove the part, but be sure to discharge the capacitor before checking.
Posted on Sep 10, 2009
Check and, replace your D1,D2.etc. diodes
if you have a scope look for the transitional waveforms converting from AC to DC power. this is usually accomplished by a transformer T1 that bridges the two voltages. the set will either use a rectangular block with 4 wires going to the board that has a corner sliced off (12 volt full wave rectifier) or, four diodes to convert the ac (wall)voltage to dc (tv) voltage
Posted on Sep 09, 2009
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Posted on Jan 02, 2017
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