32" black diamond CRT fault

strandsman · 13-04-2012 07:27AM #1

My mitsubishi black diamond CRT died, For the last couple months the picture was flickering on/off when I initially turn it on, A few taps on the side and it works fine after, Then last week the edges started to distort and the picture started to narrow in a little, then the other nite it just blacked out with a noise coming out of the back of it. Any ideas what could be wrong, The TV is 10yrs old and to be fair never gave trouble upto now.

ZENER · 13-04-2012 02:52PM

Difficult to say without seeing it but it certainly sounds like a power supply problem or possibly line (horizontal) output. A set that age, depending on usage, may have dried out electrolytic capacitors which could cause damage to other components. Or dry solder joints or even a blown Line Output Trafo. The fact that knocking it a few times restored it suggests to me it might be bad joints though that's only a guess.

Is there any sign of life at all ? For example a standby LED on the front or a rustling noise on switch on ? A ticking noise perhaps ?

A set that large will probably cost in the region of 100 euro to repair depending on what parts are required. A basic 32" LCD would set you back about 270 to 300 euro nowadays.

Ken

strandsman · 13-04-2012 03:11PM

There is no LED, but as soon as i press the on button there is a pulsing low volume noise

ZENER · 13-04-2012 03:15PM

Is it coming from the speaker or from the rear of the set ? Pulsing usually means a supply rail is trying to raise but something is pulling it down as it does. Possibly caps but no way of telling without seeing it. Where are you based ?

Ken

strandsman · 13-04-2012 03:30PM

I took off the cover it seems to be coming from the circuit board near the fuse

strandsman · 13-04-2012 03:41PM

cork boy

ZENER · 14-04-2012 08:30PM

Impossible to diagnose accurately without hands on. Any number of things could be causing the problem. A local TV repair man should be able to give you an estimate for a small fee. Might be an opportune time to "upgrade" ?

Ken

dharn · 15-04-2012 02:28PM

there are working crt tvs being given away on adverts .ie for free

strandsman · 16-04-2012 09:40AM

decision made sat morning, bought a new 40" sony, I'll probly dump the CRT, but if i had the room i'd like to take it apart and try to fix it, Thanks for your replies anyway.

ZENER · 16-04-2012 06:45PM

What's the model number of the Blackdiamond ?

Ken

strandsman · 17-04-2012 08:02AM

it's BDS2851WS,

32" black diamond CRT fault

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