Question about Standard (CRT) Televisions
I have a Sony TRINITRON KV-27HSR10 TV set which works but the picture flickers pretty badly during power up. It's been checked before by an electrician and he said a capacitor must be replaced. Specifically, a 10uF 250V electrolytic capacitor.
I have a soldering iron and want to replace it on my own. I don't remember which capacitor it was on board, but I'm guessing the capacitor should be leaking or bulging.
I wanted to know which capacitors will I need to discharge in order to safely work on the board? And will I need to discharge the TV tube?
I think that you will find the picture tube to be more expensive than a replacement TV, if it is still available (unlikely). That being said, it is also unlikely that the tube itself is the problem, The more common problem is the horizontal output transistor or the flyback transformer. Either part should still be available for a reasonable cost. Check with a local servicer for the part numbers and costs. These are common parts.
Posted on May 19, 2009
have over 10 years experience in electronic tech
I know this isn't what you want to hear, but the problem you've described can't be fixed with troubleshooting. Your TV will have to be repaired. There is a part that has developed a defect and needs to be replaced. If you're still in warranty, the TV will be repaired at no charge to you. The warranty would likely be at least one year from the date of purchase from the manufacturer. If you purchased an extended service plan they will repair the TV at no charge as well.
If the TV is no longer in warranty, it will likely cost a minimum of $150 parts and labor. This is assuming that you only need one circuit board or small part. If the problem is more than one of the circuit boards, the price of repair could go much higher.
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Posted on Jul 11, 2009
If you are hearing a click and the shut off and on during the time of the set coming to start up, then is possible that the Line output transformer is having a leak and then clearing up later to steady.
Open the back cover and clean up the dirt in the LOT. Now with the back panel taken off - with precaution not to touch any parts- put the set on and listen to any ticking noise.
If so shut off and solder the section from where you re hearing the noise. If the fault still is persistent, the check on the capacitors in the Power, Horizontal vertical and HT.
If you suspect that the set stabilises on heat , use a hair dryer to heat up the circuit in suspicion, then centre on to the component.
Posted on Sep 01, 2010
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