Philips 42pfp5332 doubt panel

[toty79]

Hi to all the friends of the forum, and thanks to all of you in advance, from the photos that I enclose how many chances are there is not the panel to lack ..? practically there are 4-5 very thin black lines at the top and bottom of the display, I know that it probably has a faulty panel but my doubt arises because .... a voltage .. the VE on the X-sus turns out to be low compared to the one screen-printed on the panel, the TV at the start could not turn on with a brief flash of the screen and then return to standby and stay there, replacing some electrolytics on the psu that were not swollen but at a loss .. the TV turns on and works regularly but with that defect that I am attaching to you in the photo, moreover the trimmer that would regulate the said VE tension seems not to act even moving it either at the maximum or at the minimum..varia only a few volts ... 1-2 at most .. thought it could depend on this. ..to someone and it happened to solve a similar problem only because a tension was not respected as in this case ... I'm about to dismantle the tv..but I wanted certainty from you more experts thanks
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[R_J]

Re: Philips 42pfp5332 doubt panel

Check or re-seat the ribbon cables between the panel and the buffer boards at the locations of the lines, If that does'nt help, it could be a bad buffer ic or the panel.
Any of the voltages being off slightly would effect the whole picture, not just a couple lines.

[toty79]

Re: Philips 42pfp5332 doubt panel

as always punctual thanks R_J

I carefully cleaned the ribbon cables without result, the voltage VE is 60v and the trimmer does not work, all the other voltages are ok, on the panel the VE is written that should be 102v .. so very low, on the buffer I checked little .. what could I check further?

[toty79]

Re: Philips 42pfp5332 doubt panel

as always punctual thanks R_J

I carefully cleaned the ribbon cables without result, the voltage VE is 60v and the trimmer does not work, all the other voltages are ok, on the panel the VE is written that should be 102v .. so very low, on the buffer I checked little .. what could I check further?

Ysus LJ41-04211A rev 1.3
Xsus LJ92-01392A rev AA1
Buffer LJ41-0412A rev 1.6

[R_J]

Re: Philips 42pfp5332 doubt panel

For the black lines:
You can check the buffer ic's for shorts with a meter in diode test, by placing a probe on the connector going to the y-sus and the other probe check each side of the connector going to the panel connector. each pin should be aprox 6xx to 7xx (like a diode) if one of the pins checks shorted, that buffer ic is bad, If all the pins check ok, its likely the panel is at fault

[ReeceyBurger123]

Re: Philips 42pfp5332 doubt panel

Panel

[toty79]

Re: Philips 42pfp5332 doubt panel

Thanks R_J

Tested all ic buffers as described and all in the normal range, no short circuit. After that I dismantled the frame and got to the ribbon cables, some of which prompted the lines to disappear and then reappear again..so I confirm matrix defective panel, thanks to all