Philips 42PFP5332D/37 Plasma suspect main board

[Caleb]

Hi, I picked up this unit last night and ran through the basic tests.
Symptoms were constant cycling of relays upon applying power. Isolated power supply and all outputs test within spec, started removing connections one by one and upon removing the 12v ssb connector the tv powers up. On this set the ssb (main) has a dc converter to provide 3v3, 2v5 and 1v2 from the 12v supply. I am making the assumption one of these is faulted. I would like to be able to check test patterns by jumpering the control board and wanted to make sure I am looking at the correct test points before I try it out, it is not shown in either the panel manual or the service manual
Picture is off ShopJimmy, I was planning on putting a jumper across the 4 pins in the top right corner (cn2013), is this correct?

[Caleb]

Re: Philips 42PFP5332D/37 Plasma suspect main board

Well I tried out pins 3 and 4 and it didnt seem to do anything. However the set did give me 6 blink code indicating a 5v fault. After testing the 7u25 mosfet it indicated short circuit, I desoldered and now the set fully comes up, I am able to change channels, access menus and so forth. However the set does not display any video ( I assume because of the missing 5v) Off to see if I can locate the si4936ady mosfet.

[Caleb]

Re: Philips 42PFP5332D/37 Plasma suspect main board

After fixing the 5v fault the set works again. For some unknown reason the tuner is very noisy but other inputs work just fine. The panel ended up having a single column fault but it isn't very noticeable, guy I fixed it for was pretty happy.

[barkers40]

Re: Philips 42PFP5332D/37 Plasma suspect main board

After fixing the 5v fault the set works again. For some unknown reason the tuner is very noisy but other inputs work just fine. The panel ended up having a single column fault but it isn't very noticeable, guy I fixed it for was pretty happy.

So what was wrong I'm having the exact same thing was it the mosfit?

[Caleb]

Re: Philips 42PFP5332D/37 Plasma suspect main board

mine ended up as a short beyond the mosfet that was dragging down the voltage, I dont remember exactly what component was causing it but it was several components out and beyond the voltage reg on the rear of the main board.