LCD TV Repair made easy # 11

http://www.tvrepairinfo.com/
In this video I demonstrate a few more tips you can use to troubleshoot your switching power supply and LCD TV.

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Category:

Education

Tags:

• Switch mode power supply
• Switching power supply
• TV repair
• frequency counter

[dukestt]

I have a JVC flat screen and it does rather a strange thing. It started by turning itself off after around two hours and then switching back on. Nothing strange in that could be a few things. No, the strange thing is , if you have the TV upside down nothing happens it stays on but if you turn it right side up it switches off after two or three minutes. I'm not sure what is causing it but there you go. Any thoughts?

[GrantsPassTVRepairs]

@dukestt Sounds like a strange problem. The only things I have ever seen cause a TV to automatically turn on is when one of the tactile switches goes bad. Sometimes you can't even tell the switch is bad when you test it. In a case like this I disconnect the switch panel and use the remote control to see if the problem continues.

Dave

[dukestt]

@GrantsPassTVRepairs I had it on bench test all yesterday and its working fine now and i didnt do anything to it other than suck all the dust out with a hoover and turn it upside down. I got it from the local tip (dump) so i have got a working 32" JVC flat screen for nothing. Cant complain happy days.

[GrantsPassTVRepairs]

@dukestt Pretty cool find.

I have never seen a TV start working just by blowing out the dust.

Sometimes temperature variations can effect the way electronics work. Especially with capacitors.

[realybigross]

why would freeview be pink ok on tv and text

[whiskeyify]

Have fixed many CRT tv's...many times if listen carefully when you plug the tv in you'll hear a little squeaking sound from the power supply, that means it's working.

[rrsd69]

very educational, thanks for the sharing of knowledge!!!

[GrantsPassTVRepairs]

@CanyonLakeTX Yes. I have often seen the inverter board cause the TV to shut off right after it starts.

[CanyonLakeTX]

@GrantsPassTVRepairs Unfortunatly I am mostly a componant level replacment skill, I wish I was more. Will the inverter board cause the system to try to start then power off?

THanks

JQ

[GrantsPassTVRepairs]

@CanyonLakeTX If you replaced the main board and power supply there isn't much left other than the inverter board. Are you guessing at what might be wrong rather than doing tests?