TV Plasma LG 60PN5000 ZSUS 15v missing

[alfredomfr1]

All Voltages are OK except ZSUS 15v.
YSUS board disconnected still 15v missing.
ZSUS was replaced: 15v missing.
Any help will be appreciated

[Biruslapio]

Re: TV Plasma LG 60PN5000 ZSUS 15v missing

15V is produced by Y-SUS, so follow the traces on that 15V pin and see where it leads.
Never power up a plasma with loosened or missing screws on any sustain boards.

[alfredomfr1]

Re: TV Plasma LG 60PN5000 ZSUS 15v missing

I will check the Y-SUS

[alfredomfr1]

Re: TV Plasma LG 60PN5000 ZSUS 15v missing

3ohm R251 Open, Replaced.
Now I have 15v but fluctuating to 16v and 15v and a metallic sound like tin, tin tin. All other voltages fluctuating a little bit but in range.

[alfredomfr1]

Re: TV Plasma LG 60PN5000 ZSUS 15v missing

There is not green light on the control board and the TV red light is blinking

[Biruslapio]

Re: TV Plasma LG 60PN5000 ZSUS 15v missing

Further inspection on y-sus is required, test every IGBT and gate drivers for shorts, big resistors (those green ones) cannot be open.
The inductors on Z and Y buzz when working, but it's at a low frequency.

[alfredomfr1]

Re: TV Plasma LG 60PN5000 ZSUS 15v missing

D603 shorted
After replace D603 TV works well but instead of measuring 15v it measures 17.8v

[Biruslapio]

Re: TV Plasma LG 60PN5000 ZSUS 15v missing

If memory serves correct the 15V on LG plasmas is almost always close to 17V, so 17.8 is a small offset from the norm, no need to worry if nothing is overheating and the picture is fine. Is D603 at Y-SUS?

[alfredomfr1]

Re: TV Plasma LG 60PN5000 ZSUS 15v missing

Yes, it is. Thanks for your help.