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-   -   TV Plasma LG 60PN5000 ZSUS 15v missing (https://www.badcaps.net/forum/showthread.php?t=105972)

alfredomfr1 04-29-2022 11:26 AM

TV Plasma LG 60PN5000 ZSUS 15v missing
 
10 Attachment(s)
All Voltages are OK except ZSUS 15v.
YSUS board disconnected still 15v missing.
ZSUS was replaced: 15v missing.
Any help will be appreciated

Biruslapio 04-29-2022 11:36 AM

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 04-29-2022 12:30 PM

Re: TV Plasma LG 60PN5000 ZSUS 15v missing
 
I will check the Y-SUS

alfredomfr1 04-29-2022 03:16 PM

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 04-29-2022 03:20 PM

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 04-29-2022 03:25 PM

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 05-04-2022 09:49 AM

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 05-04-2022 01:52 PM

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 05-04-2022 02:25 PM

Re: TV Plasma LG 60PN5000 ZSUS 15v missing
 
Yes, it is. Thanks for your help.


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