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philips 40pft4509/12 dead

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bonesy:
Hi guy's got the above model Philips,which is dead no st-by light.The set has no customer controls at all on set,just remote.I've checked psu voltages,the always 12 volts is low at 9volts,24volts sitting at 20 volts.There are no voltages from signals board back to psu (psu on or st-by on/off)I presume because the 12 volts to signal board is low.The voltage across the smoothing caps is just short of 360 volts,caps rated at 450 volts,so may be a little low.Just wondered if anyone's had any dealings with this 4000 series t.v.

Davy:
Is there no 5V for the micro?

Dave

bonesy:
No ,there's nothing marked up on either end of psu cable,so I presume its derived from the always 12 volt, on the signals board.& because the 12volt is low,then 5 or 3.3 volt is also very low.

Davy:
Strange, maybe look around the micro for a voltage clue, should be a electrolytic around,  the main clue is no standby light.

Dave

bonesy:
Well spent a bit more time on it Saturday,Ran up psu out of set by applying 5 volts to psu on pin from ssb.All rails came up to near marked values.As I said it has no customer controls on set,or so I thought!But when I removed the ssb board from set,right at the bottom of the av inputs section,I found a small tact switch.When I looked on bracket to see what it was,it's marked with on/off symbol.Gave it a push & away it went,all working fine.Stupid engineer,stupid design,still at least wont fall for that again.Lol.

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