Re: LG plasma 50pk550 EAY60968801
No change but just got my 60" going, EAY60968901.
No change but just got my 60" going, EAY60968901.
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Re: LG plasma 50pk550 EAY60968801
When you get rapid clicking, check zd301 for short, 17V will also be missing. Sits around ic301.Comment
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Re: LG plasma 50pk550 EAY60968801
Still wasting my life on this one but I've forced everything on at P813, end result is the same as in the TV except instead of quitting after 3 powerup cycles, it continues so the mainboard must quit powering up , 3 strikes, you're out.
it has
Stdby 3.4 - 5v on run
M17V is present, M5V is on, Err Det (not used) is 4.9V, AC DET is also Ok 4.9V
VA, VS zippity do dah
I've swapped L6599D, R2A02117 and the micro all from a good board , no change
I've managed to spike and kill ZD301 several times now probing the optos, that kils the 17V around IC301 and rapid endless cliking.
I've confirmed the micro off the bad board is ok as the good board runs just fine using it.
Oh and the 60" is running fine, no idea but ever since I jumpered that one and forced it on, it's been fine, WTF, bad caps?Last edited by tw2005; 10-13-2017, 01:13 PM.Comment
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Re: LG plasma 50pk550 EAY60968801
You forced it on and all of sudden tv works fine? if so weird indeed i had a samsung 21' monitor do something similar except when i replaced caps on it and a pair of fets it wouldn't work so while it was plugged in and turned on i started to wiggle components caps, and connectors and no go...... so more wiggling then on inverter i wiggled a cap all of sudden it made a spark arc sound and it worked flawlessly ever since. just little touch up on the joint and all was well even though the joint looked ok. weirdComment
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Re: LG plasma 50pk550 EAY60968801
ZD301 seems shorted in circuit, Ill pull it and check whenever I get time tonight
Have the part number handy?Comment
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Re: LG plasma 50pk550 EAY60968801
Ordered new diodes, will post results tuesday or wednesday when I get themComment
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Re: LG plasma 50pk550 EAY60968801
I replaced zd301 and it solved the rapid clicking.
Now I get the normal slow click and retry. click click red light dims slowly as it shut off both relays. The normal problem you know.
EXCEPT : I THINK this is mainboard related. Why? Because I can instantly start the tv if I probe the 5.1 rail at the mainboard connector relative to chassis ground.
I bet I could put a 10Meg resistor and it would work flawlessly
Something to think aboutComment
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Re: LG plasma 50pk550 EAY60968801
sorted itself out after a few power cycle. Been booting up and working perfectly.
Whats the service menu button combo? I'd like to check the hours. It's very very nice, could be low hours.
tw2005: I owe you at least a few fosters for your help j/k, Ill get you some real beer!Comment
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Re: LG plasma 50pk550 EAY60968801
Fosters? I can feel a XXXX coming on,
https://www.youtube.com/watch?v=RMRy8bjdohs
https://www.youtube.com/watch?v=GniEAoEHG_c
https://www.youtube.com/watch?v=PcDuU-C5I0w
https://www.youtube.com/watch?v=vAB0SGh6q18
https://www.youtube.com/watch?v=0yM9xD6RQj8Last edited by tw2005; 11-11-2017, 12:06 AM.Comment
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Re: LG plasma 50pk550 EAY60968801
Dear all, finally I found the culprit of cycling relay. I have checked and change all the high esr elcap and still clicking. I found that there is a bad joint in the T901 transformer. After resoldering the joints its back to liveComment
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Re: LG plasma 50pk550 EAY60968801
I know this is a really old thread but thanks hartonoh for this post. Everything discussed her previously checked out on a power supply I have here and this put me in the right direction. I'd already inspected for cracked joints and overlooked one on one loan leg for T901.Comment
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Hi, I'm seeing one 9V relay having temperature 40C on its 9V (primary) side. Does that seem right? I switched 2 relays on that board and the temperature was the same (on the same position), so I'm sure it's not a faulty relay. I measured voltage on that relay and it was 9.5V DC, so that looks good. I don't see any other relay on that board having that kind of temperature and they have 9V on them too.
I thought maybe the transistor that is switching this relay keeps switching on/off, so I also checked for AC and there was almost none: 0.3V using mV range. No steady frequency was shown, but... -
Hi everyone!
I have this board that suddenly stopped supplying power to an output that drives an interchanger cleaner motor.
I checked while the board was in place with all wires attached and there's no AC voltage on the corresponding plug X5
This X5 is driven by fuse F8 (tested OK) which comes from the second orange relay
To make sure there are no charcoaled contacts inside the relay, I got a 24VDC power supply and got it ready to manually power up the coil side of these relays.
I respected the polarity, positive to cathode of protecting diode
So provided all... -
Hi ,this appears to have 2 faults
black lines on raster and faulty main board ?
let me explain futher
at switch on the relay does a few slow clicks with red led blinking and repeats every 10 seconds .i ran the psu into 2x 100w lamps and it runs fine all day supplies good .
i removed y sus and x sus checked for dry joints and checked all igbt anf fets all ok
next i removed buffer and checked for any s/c buffer ics all ok
so i unplugged feed to main board from logic board and linked test points pin 3 and 4 ,
tv still trips but now i get plain... -
I was working on this CNC machine today found no keyboard functioning no control relay powering on
The screen powered on and was giving an operation error but the manual was not very clear about what the error exactly was but with a little bit of troubleshooting and finding out that the control relays not powering on and no keyboard functions we narrowed down to this one switching power supply which of course does not have any indicator LED light they are on the keyboard interface/relay controller board
Found shorted diodes on main controller relays there are 3 of them that... -
Hi everyone,
I'm working on repairing a Pilz PNOZ X4 safety relay module. When I opened it up, I found some of the connector pins detached from their pads. I replaced the connector with individual wires, but the issue remains.
The module is set to dual-channel mode with manual start. In this mode:- Y36-Y37 and Y1-Y2 are bridged.
- 24VDC is applied across A1-A2.
- It monitors two emergency circuits (S11→S12 and S11→S52).
- When both are closed (24V present on S12 and S52) and the start button is pressed (S33 connected to S34), the NO contacts (13-14, 23-24, 33-34)
Comment