TV Slow to give a picture

[eguttridge]

Hi

My 10 year old TV takes 5 minutes after switching on to give a picture. The first 5 minutes show intermittent pictures flickering to a black screen and no sound. This usually only happens on the first switch on of the day, as if it needs to 'warm up'..

Any ideas?

Cheers BP

[Ian Stirling]

The electrolytic capacitors in the power supply have gone high ESR (probably). Replace them all, or at least any warm ones. The right tool to use to test them is an ESR meter, but you probably don't have one.

[Sam Nelson]

Erythrocyte Sedimentation Rate?

[Nigel Molesworth]

Buy a new one.

[Rob Morley]

effective series resistance

[ben]

Heh? Just tell him to dump it. Ten years is not worth spending money on a TV of that age because the components are weak and on the way out.

[ben]

Equivalent series resistance. ;-)

[ben]

Better of trying to get blood from a stone. ;-)

[T i m]

;-)

But like fixing an old car, a few quid and a bit of d-i-y time might (and often does) prolong it's life for quite a while?

Since I have had this monitor style Sony 18" TV (our main TV) I have replaced the HT transformer, a couple of small caps (causing teletext faults) and two mains switches. Total cost over the 20 years about 50 quid?

*Having* it repaired would have cost more of course (and therefore may not have been cost effective) but that's why this is a d-i-y group eh! ;-)

All the best ..

T i m

[ben]

Fine! for you, but the OP might not be electronically minded and should not be delving into a 4.5kV lethal piece of equipment.

[T i m]

Oh indeed Ben .. and I avoid TV / Monitors wherever possible for that reason .. however I was just answering the point re just dumping stuff outright, not saying the OP should do such repairs himself etc.

All the best ..

T i m

[eguttridge]

Thanks Guys.. so I understand from your comments that the best way forward is to dump it.. there is no easy fix right?

[Harry Bloomfield]

ben formulated on Sunday :

Nearer to 30Kv.

[ben]

Irrelevant, either will give you a buzz. ;-)

[Capitol]

Please get it right--- 25/30KV. But frequently not lethal as you jump too fast!!

Regards Capitol

[tony sayer]

In article , Capitol writes

So what are the they running final anodes at these days then, it used to be 25 kV when I were a lad, has it gone up then?.....

[Capitol]

Up to 30KV for larger screen sizes. It's the only way to get the brightness without bending (overheating) the shadow mask AIUI.

Regards Capitol

[Ian Stirling]

True. I had a nice 19" monitor, which after several years of service showed a similar fault. Opened it up, and diagnosis was easy - as the capacitor was warm. Replaced it with one from the parts bin (but would have been about a pound new) and it worked fine! For several minutes, until I put the case back together in the wrong order, and heard a whooshing noise, as the back of the tube cracked.

[T i m]

Oh no! Don't you just hate it when that happens .. ;-(

A mate did the same with his video .. found a fuse gone and went to test it with a logic board propped up with a small screwdriver. When he turned it on it worked .. or did until the screwdriver fell over onto another board ... ;-(

But, for every one we loose there might be one we win ...

All the best ..

T i m

[John Rumm]

I did that on an old amp/receiver - was tracing through looking for a minor PSU fault, when trying to reach a little too close to the legs of another component with a DMM probe resulted in a quick flash and a now totally dead amp!