Philips 49PUT5801/98 PANEL PROBLEMS ON BOTH HALVES

[limtk55]

So this Philips TV has backlight but no image. VGH voltage was 0, so decided to buy a replacement TCON board. Fitted new board to no avail. Now panel PCB control boards have multiple shorted MLCC caps on both sides. TCON ICs hot to the touch suggesting that panel drawing more current than usual (internal short?)

Measured voltages on new TCON as follows :
VGH (29.67V)
VGL1 (-4.97V)
VGL2 (-14.89V)
VCC (3.282V)
VCORE (1.202V)
HVDD (7.95V)
VDD (15.97V)
VIN (11.98V)
VCOM1 (4.25V)
VCOM2 (4.63V)

Removed caps that were shorted one by one and tested all ok but short remained. Now at a loss on how to proceed further. Please see attached pictures for more details.

[Diah]

Re: Philips 49PUT5801/98 PANEL PROBLEMS ON BOTH HALVES

remove one ribbon related to the expected short side and switch tv on with signal.. let see yours screen displaying clear half screen !!!!

[limtk55]

Re: Philips 49PUT5801/98 PANEL PROBLEMS ON BOTH HALVES

remove one ribbon related to the expected short side and switch tv on with signal.. let see yours screen displaying clear half screen !!!!

Already did that and see the attached pictures. It breaks my heart!!! Now it appears that after measurement, both sides of the scalar panel PCB are shorted to ground at the set of 4 MLCC caps.

[Diah]

Re: Philips 49PUT5801/98 PANEL PROBLEMS ON BOTH HALVES

test panel PCB always should be disconnected from T-CON