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How do bridge diode or bridging diode like you said looks like in the power supply board for my westinghouse lcd tv?

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A bridge rectifier may consist of four rectifier diodes wired as a bridge rectifier circuit or as a plastic package which has four leads (it contains four rectifier diodes). Two of the legs the bridge are connected to the AC input and the other two legs are the DC output.
For diagrams and full explaination click on this WEB site :-
www.allaboutcircuits.com/vol_3/chpt_3/4.html

Posted on Nov 20, 2009

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My Sony Bravia LCD TV will not turn on.


If no voltages,then replace all main capacitors,power ic and optoisolater ic,do not forget the rectifire diodes/bridge and the output diodes.

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In onida tv d2498 and fuse in power supply gone on connecting ac.Without main board installing please help


If it's not the main board that's causing the fuse to blow then you have a short circuit somewhere in the power supply. Check things like the electrolytic capacitors. The ones that look like little cans. They should all have flat tops. If any are bulging out at the top they will need replacing. Also check the bridge rectifier which is a black component usually standing up on the board with four legs. If there is no bridge rectifier there will be 4 rectifier diodes together. They are black cylindrical items with a sliver band on one end and a lead out of each end. They are usually located near to where the mains lead enters the power board. Other things to check are power transistors, they are usually 3 legged, (sometimes 2 legs if they are used as a diode) black items with their case fixed to a heat sink (aluminium block.)

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Sony LCD KLV32BX35A 5x Blinking Problem.


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1 Answer

Turns on immediately turns off


check for shorted component parts at power supply board like bridge type diode and FET transistor. if those are good, disconnect the connectors that supply going to inverter board and then turn on the tv unit if the light indicator at front panel stay and 24v supply doesn't drop which mean the inverter board was the problem of suddenly turn off.

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3 Answers

Fuse keeps blowing in my philips 32pfl3505d/f7 tv


Good day!!!!


That problem is cause of shorted bridge diode or power mosfet..

just see the picture below to see the image of bridge diode and power mosfet..

bugoy31_16.jpg

If you don't have a tools or you have no electronic background you only have to is order the new power supply board..

I hope this solution will be helpful..Thanks for using fixya....

Sep 04, 2011 | Philips 32PFL3505D 32 in LCD TV

1 Answer

My fuse blew in my Samsung 53" Plasma TV. I changed it, but it's blown again? What should I do next?


The fuse blown because theres a short circuit connection in the PCB power supply of your television.Please check the power supply inside,remove the back cover to see the power supply section.unplug first to avoid electric shock.Will you check the bridge type diode first.If the bridge type diode or diodes is shorted the fuse is always blown.Using digital tester check diodes,regulator transistor,and other transistor around the power supply.

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1 Answer

HI, I have a Sylvania tv LCD LC155sc8 no turn on, somebody can help me. I apreciate a lot your help about it, fuse ok, diode bridge ok


You seem to know a bit about troubleshooting.
do you know what the inverters are?
they are ballasts for the flourescent backlight.
they are a circuit board that is on either the far left or right of the back of the panel, sometimes they are on both side (depends on the panel used)

from the power supply board there will be a multi pin connector going to the inverter board.
Look at the power supply end of the connector and find the pins labeled 24V.
If that voltage is present when you push the "on" button, your power supply is working and your main board is working. You have bad panel. Too expensive to repair.

If that voltage is NOT present. Look at the power supply board for capacitors that have bulged tops.
Replace them with same value...
if no capacitors are obviously bulged- your main board is bad.

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1 Answer

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hi there, fuse is found at the power supply section. I f you can unscrew the back casing and look in the PCB or board the section where the power cord met. It usually have this Bridge type Diode and with some big capacitors. Well just make sure upon returning the screw it is complete and no missed slot to prevent damaging the case when lifting. Hope it helps, please rate and vote

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1 Answer

Proscan lcd tv model 26lb30h blows fuse on power board


If the fuse blows again after replacing it, there's a shorted diode, bridge rectifier, capacitor or transistor in the power supply.
I repair these power supplies. If you need furhter assistance, write to jah2mil@hotmail.com

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