digitrex ctf3271 lcd tv turning on fault

[basherh]

hi all i have a digitrex ctf3271 lcd tv, when i turn on power switch at back of tellie the red light comes on but thats it. i tried the romote and the on button but it stays on standby. turning it off and on worked for a while
but now nothing.
any help would be great ty

 

[ChrisFrost]

Based on similar faults with Philips TVs, the problem could be to do with one or more of the capacitors drying out and going faulty in the power supply.

The challenge you'll have with (I presume) a supermarket branded TV is getting any service support beyond the 12 month warranty. They are sold at lower prices than branded sets because the cost of setting up a service network has been cut out. You're best bet is to go back to whoever you bought it from and see what they'll do for you. Good luck

 

[tockworth]

Although capacitors drying out would possibly have that effect capacitors drying out and going low capacitance is an age related thing I would doubt that a lcd tv is a bit too young (just my opinion) Any fault on the power supply or associated circuits will cause the set to sit in permanant standby this is a general rule with most modern tv's it's a fail safe inbuilt design and is the reason why tv fire's are fairly rare compared to two or three decades ago when tv's did not close down running under fault conditions then overheating and then catching fire. As long as you are sure your remote control is firing then you can assume there is a more serious fault within the tv circuitry.

 

[ChrisFrost]

Although capacitors drying out would possibly have that effect capacitors drying out and going low capacitance is an age related thing ...

It's also a temperature related thing. It's a problem with thin tellys compared to CRTs. There's very little space to fit all the components, and what space there is is arranged in vertical columns doesn't do much for heat dissipation.

My experience is with Philips plasmas. Their PSU design put two 85oC caps close to and just above a mars bar sized heat sink. You wouldn't use a heat sink of that size unless you've got a transistor or two attached to it that generate some heat. The result was that the caps slowly cooked over a period of a couple of years. The problem manifests as longer and longer start up times from cold until eventually the TV never switches on. Two or three years worth of viewing was enough to kill those caps. I'm not saying this is definitely the cause here, but it is worth considering.

 

[plugwash]

And there is the problem that some capacitors are just plain cr*p from the start.

 

[basherh]

hi thanks for replys i got it free last year with a mobile phone
is it worth getting repaired or will it be to expensive as warranty has run out thanks

 

[gman76]

I'd say if you know somebody who knows what to look for & is handy with a soldering iron, let them have a look.

As it was "free" it might be worth throwing a few quid at it - you need to weigh it up against the price of replacing it.