41GR8840 Blows Fuses

• • D
  • dgliddell
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• posted
  17 years ago
  Mon, Jun 20, 2005 10:23 AM

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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dgliddell

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  • Craig Hart
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• posted
  17 years ago
  Mon, Jun 20, 2005 3:48 PM

there's a short somewhere in the unit.

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Craig Hart

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  • Joerg
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  17 years ago
  Mon, Jun 20, 2005 8:56 PM

Hello Craig,

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Or maybe a capacitor on the verge of failing.
Regards, Joerg

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Joerg

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  • dgliddell
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  17 years ago
  Tue, Jun 21, 2005 9:38 AM

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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dgliddell

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  • Phil Allison
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  17 years ago
  Tue, Jun 21, 2005 9:56 AM

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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

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Phil Allison

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  • Mark Harriss
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  17 years ago
  Tue, Jun 21, 2005 10:16 PM

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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?.

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Mark Harriss

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  • Mark Harriss
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  17 years ago
  Wed, Jun 22, 2005 4:21 AM

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

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Mark Harriss

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  • Mark Harriss
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  17 years ago
  Wed, Jun 22, 2005 4:34 AM

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

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Mark Harriss

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  • valiumboy
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  17 years ago
  Fri, Jun 24, 2005 11:14 AM

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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valiumboy

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