41GR8840 Blows Fuses

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dgliddell Contact options for registered users 's Avatar (by Gravatar) posted on
June 20, 2005, 10:23 am
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I have a Philips 41GR8840 rear projection TV which blows the main
circuit board fuse instantly (even when the unit is in standby
mode)Leading up to this problem it used to make a funny crackling
noise. I dao't have a circuit diagram and feel like I'm fumbling in the
dark a bit. Can anyone shed any light as to the possible problem?

Thanks

Dave


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Craig Hart Contact options for registered users 's Avatar (by Gravatar) posted on
June 20, 2005, 3:48 pm
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Re: 41GR8840 Blows Fuses


there's a short somewhere in the unit.


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Joerg Contact options for registered users 's Avatar (by Gravatar) posted on
June 20, 2005, 8:56 pm
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Re: 41GR8840 Blows Fuses


Hello Craig,

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Or maybe a capacitor on the verge of failing.

Regards, Joerg

http://www.analogconsultants.com

Mark Harriss Contact options for registered users 's Avatar (by Gravatar) posted on
June 21, 2005, 10:16 pm
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Re: 41GR8840 Blows Fuses


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Does it just blow with the wire melted or is it
an almighty bang with the fuse glass shattered
and blackened on the inside?.

dgliddell Contact options for registered users 's Avatar (by Gravatar) posted on
June 21, 2005, 9:38 am
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Re: 41GR8840 Blows Fuses


It just blows with the wire melted. I have disconnected the leads off
to other parts to the unit (eg EHT) therefore isolating the power
supply section. The result is the fuse blowing just the same.


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Phil Allison Contact options for registered users 's Avatar (by Gravatar) posted on
June 21, 2005, 9:56 am
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Re: 41GR8840 Blows Fuses



< snipped-for-privacy@aapt.net.au
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** You do realise the fuse MUST be a  "slow blow"  type ????


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 **  See above -  a standard  (plain wire)  fuse will blow at EVERY switch
on due to the massive surge drawn by the de-gaussing coil.






............    Phil









Mark Harriss Contact options for registered users 's Avatar (by Gravatar) posted on
June 22, 2005, 4:21 am
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Re: 41GR8840 Blows Fuses


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Does the original fuse have a little spring inside
or blobs of solder-like metal on the wire?.

Mark Harriss Contact options for registered users 's Avatar (by Gravatar) posted on
June 22, 2005, 4:34 am
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Re: 41GR8840 Blows Fuses


Do rear projection TV's have a degaussing coil Phil?,
I've never seen the inside of one.

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valiumboy Contact options for registered users 's Avatar (by Gravatar) posted on
June 24, 2005, 11:14 am
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Re: 41GR8840 Blows Fuses


I was just about to ask the same question.The main fuse should be a slow
blow type.
Primary power supply fault, bridge rectifier?, main filtering cap? chopper
transistor?


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