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Power problems

If having power problems on most electronics check caps or dry joints
then go looking further

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Tv will not come on all three lights are blinking

In most cases the standby light might blink with different rapidity to indicate a fault relevant to the processor. It is possible that most of these indicate that there are errors in the processing section . Since there is a possible short or leak in the circuit the output driver section can take in huge current to trip the SMPS or from advice from the micro processor. Remove the power plugs and make sure that high voltage sections are discharged of the potential stored in capacitors. Look for visible signs of leak or of busted capacitors. Look for bulged capacitors or damaged components- burnt or busted. Use a multimeter to check the continuity or shorting in components, if so detach from circuit and test . If the voltage builds up and the set power ON and then shuts up then the suspected section must be checked in detail.

The processor must have the +5 voltage to the function properly , the +B and secondary voltages also must be checked to infer the fault. Trace with caution and in running through the signal path , circuit trail.

If the set power on when it is tapped then it is typical with aging as many sets develop dry soldering joints over a period of heating and cooling.So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs or poor performance.

The best way to check for loose connections is to tap lightly when the set is powered on , If there is change while tapping then it seems that there are DRY solder joints. Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points.

Sometimes the fault occurs when the set warms up, if so you can simulate the heat using a hair dryer on the suspected areas, try with the power supply, distribution, Processor controller, driver controllers on the A/V related sections. Also the use a FREEZE-IT spray can simulate the components to cool and show up the fault.

Based on the above method you must be able to locate the area of fault and solder the sections. Sometimes large IC's- ones with more pins- tend to have drying in some pins and so cause faults related to the IC's protocol. Have a rough idea of looking into the areas to reduce the time of probing.

Jul 12, 2011 | Samsung LN46A650 46 in. LCD HDTV

1 Answer

We have a ws55819, and it won't power on at all even using the remote. There is no lights or anything that comes on...could this be a power supply or would it be cheaper to just by a new tv?

it will probably be the power supply

so first you will need to check for obvious stuff like board fuse,switch,blown caps or dry joints

if looks ok then check the dc voltage on mains filter cap (only do this if you are experienced in electronics) if ok you will have to determine how the stage is not been driven google up the number on the drive chip and check if voltages are how the should be.

Sep 03, 2009 | Mitsubishi WS-55819 55" Rear Projection...

2 Answers

Hp 1703 Video for 1second then Black Please Help if you replace the main boards ( Power & Video Or just the Power Board) will this fix the display issue. thanks

You may want to check your power and connection cables are not showing bare wire, which is the metal hanging out of the rubber insulation cord. So just check for that and if not that I would call HP.

Jan 30, 2009 | HP Pavilion F1703 17" LCD Monitor

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No Sound From My Amp!

i am assuming the amp is not under warranty, if it is, rma it... if not, you have nothing to lose from trying this.

hitting it and having it work usually means something is loose or broken, remove the case and extract the circuit board.. clean all parts thoroughly using a good electronic or contact cleaner, i use crc qd electronic cleaner as it is cheap and available at most auto supply stores, just make sure whatever cleaner you use is not industrial duty and is plastic safe.

after the entire thing is cleaned (coils, caps, anything resembling dust), check with a magnifying glass for any broken solder joints, you can also very lightly touch components and see if they move.. this sounds like either broken solder joints, extremely dirty contacts, corrosion, or dry caps.. you can usually locate dry caps by looking for corrosion around the cap and discoloration on the top of the cap.

hope this helps, and hope you get it running; the ps2 amps are pretty nice when it comes to accurate sound reproduction.

Oct 28, 2007 | Car Audio & Video

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