Philips 42PFL5609S/98 Intermittent screen off

[KCLim168]

Hi,

I have above TV and it has the intermittent problem of screen going off totally after about 1 hour of watching but the sound is still on. I then switched off the power and restart again but still get blank screen. I am still testing the pattern for which this happens and will update later as I find out more facts.

I have searched this forum for a similar TV (42PFL5609/98) but slightly different symptoms. However couldn't really see the status of it.

I have done a visual inspection on the boards inside for possible causes like bad cap, burn marks but everything looks fine visually.

I would appreciate friends here to further guide me to the likely cause of this.

Many thanks.

[tom66]

Re: Philips 42PFL5609S/98 Intermittent screen off

I had this fault before on an old Philips 37" plasma using a Hitachi panel. Yours seems a bit too new for that and may use Samsung panel. Check Vs and Va voltage when set shuts off, if this goes away then that is a clue to the fault. If your set has a Samsung panel then check for a light on the Y-main if it lights up then it has entered protect mode so you know it is likely Y-main at fault. Finally general fault diagnosis since it is intermittent temperature may be a fault so try heating and cooling things down and see if it works longer/shorter. Also if you have a variac try running it on low vs high supply voltage; I have seen issues where TVs work at 240V but fail at 235V.