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Strange fault with Phillips BM7502 monitor?

Llamarama

Member
Joined
Jan 2, 2013
Messages
24
Location
Tyneside
Hello everyone, I have the above monitor, however in storage it's developed a strange fault. I turn it on and I can hear the flyback squeal as normal, then the screen will emit a dull glow, the pitch of the squeal dips considerably and the power led dims, but does not go out. This cycles after between 5 and 10 seconds. I'm at a bit of a loss as to what the fault could be.

I have the schematics and all the caps look good, I believe the flyback is putting out at least something as I had to discharge the screen before delving further.

I'm highly reluctant to scrap the screen as it's a green screen with no screenburn and they're like hens teeth around here, I haven't SEEN another one, let alone seen one for sale. Any advice is greatly appreciated. Thanks in advance
 
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