Hitachi TV keeps switching itself off

[John]

Hi, I have a 4 year-old Hitachi C28W511TN widescreen TV. Recently, and only
75% of the time, when I switch it on, it turns itself off about a minute
later.

Strangely it doesn't make the familiar click and fizz inside the box that I
hear when I turn it off with the remote, it almost switches the tube off
'silently' (like a PC monitor going into blank screensaver mode) and there
appears to be a brief moment just before it does this when it 'thinks about
it' as the picture rapidly disappears once, then reappears, then switches
off (I think! - it's all very fast).

When I press ON on the remote, it doesn't 'click' on, the picture just comes
back silently without a standard 'I'm turning on' click.

It then turns off again 30 seconds later!

I repeat this 2-7 times, then it stays on for the rest of the night until I
choose to turn it off. It's like it gives up fighting with me and just
stays on, displaying a perfect picture.

It's not an IR issue as when I turn off with IR, I hear a click and fizz in
the box.

Any ideas? Help much appreciated. I'm tech-savvy and would like to attempt
a home repair if you can advise a simple part I need to replace.

John

 

[David]

Could be a failing capacitor high in ESR, start by checking electrolytics
with your ESR meter in critical circuit areas like the power supply, scan
derived voltages, etc. Also look for failing connections.

David

 

[John]

Hmm, thanks, but I'm not THAT tech savvy! Anything simply I could
replace that would definitely be the cause of this?

 

[Jerry G.]

This can be too complex, and it can be one or several of many parts.
Usually the capacitors in the power supply and scan circuits can cause this.
You would have to troubleshoot the set to locate the defective parts. The
use of an ESR meter will find the bad caps to start with.

If you are not trained, and equipped to service TV sets, I would suggest you
call in a service centre that can do a proper safe repair. There are many
safety issues when servicing TV sets. You can be badly injured, and or cause
a fire hazard if you don't know what you are doing.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
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Hmm, thanks, but I'm not THAT tech savvy! Anything simply I could
replace that would definitely be the cause of this?