Phillips 42pfl3603d/f7 No Picture

[landyboy]

Just picked up a Phillips 42pfl3603d/f7. Backlights come on but no picture, 12v to TCon both sides of fuse. Any thoughts main board?

[landyboy]

Re: Phillips 42pfl3603d/f7 No Picture

Here are some pictures of the boards.

[tom66]

Re: Phillips 42pfl3603d/f7 No Picture

I would check the VCC and VCC1.8 test points on the t-con. VCC is likely 3.3V.

[landyboy]

Re: Phillips 42pfl3603d/f7 No Picture

VCC is .890VDC and VCC1.8 is 0

[landyboy]

Re: Phillips 42pfl3603d/f7 No Picture

Correction VCC1.8 is .543VDC

[landyboy]

Re: Phillips 42pfl3603d/f7 No Picture

Both of these are low. Are these voltages supplied by the regulator on the TCON itself?

[tom66]

Re: Phillips 42pfl3603d/f7 No Picture

They are supplied by that small square chip to the right of the larger LG Philips chip.
Next, check AVDD; this is across the two small capacitors marked C111, C112 near the bottom middle right of the board.

[landyboy]

Re: Phillips 42pfl3603d/f7 No Picture

11.68vdc

[landyboy]

Re: Phillips 42pfl3603d/f7 No Picture

Suspect Bad Tcon?

[landyboy]

Re: Phillips 42pfl3603d/f7 No Picture

Ok I replaced the TCON with a "good" one off of ebay. I now have a picture but it has horizontal flickers as seen in the picture. Most of the research I did still points to a TCON. Do you think this TCON is bad as well?

[newtothis]

Re: Phillips 42pfl3603d/f7 No Picture

Possibly a bad board... That's problem with eBay

[landyboy]

Re: Phillips 42pfl3603d/f7 No Picture

Ordered a different TCON same problem. Could a bad main board cause this?

[tom66]

Re: Phillips 42pfl3603d/f7 No Picture

Possibly. A panel problem could also do so.