Re: Ceramic capacitor
I don't understand what component you mean but if its the one that connects both sides of the cap then most probably is some kind of transformer or most probably a coil which together with the cap creates some kind of oscillator. You say that the cap is 10pF but I don't know how you arrived to that conclusion, anyway even if you place a cap with close to those values, lets say 5pF to 15pf I think the thing will function without problems. Of course always better if you replace with same value as the original.
ilkatek
Member
Last Activity: 10-19-2022, 04:43 AM
Joined: 06-20-2015
Location: Brogliano (VI)
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Re: Battery Connector Shorted on Laptop
Hello Canadaboy
First of all, are you sure that your laptop brand and model is able to function correctly without the battery pack hooked in? Because maybe it needs to know you have a battery attached but if the battery (damaged) does not give back the signal that is attached and loading then the laptop just fails to continue.
In other words if and only if you are sure its not the battery that in some way is causing the problem then and only then I would suggest to open your laptop and search around the area of power inlet jack...Leave a comment:
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Re: Ceramic capacitor
Hello lezsimply
If a ceramic cap failed means that the voltage at its ends has exceeded the ranged voltage insulation. Some times they fail because the material has suffered stress over time and cannot handle the voltage peaks that some times may also occur. Anyway yours seem to be 5pF and insulation range of 3000 volts.Leave a comment:
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Re: LG 50PG6000 No Picture with sound, and boards seem OK
Hello mmservice, did you solve the problem? I have solved by detaching the bad cip and I placed back the buffer. Now the TV will not show the lower strip of the monitor image but it doesn't matter since all the films I watch with this set (I use this set only for registered films) has the upper and lower strip blanked anyway from the film format. So I will keep it as it is until some other cip fails and then I will go with the repair (unless the upper cip brakes
)
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Re: LG 50PG6000 No Picture with sound, and boards seem OK
Thank you all for your precious help.
Solved! ...well at least I know exactly where the problem is.
I have seen the link you gave me ammarben and after a check on my 2 Ybuffers I found one Cip of the lower buffer being shorted. I then mounted back only the good buffer and as expected only half video was displayed. But that was a success since I now know also that the display is functioning. Since it seems quite odd to try and change the single Cip as the pins are too close to one another) I will search to buy...Leave a comment:
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Re: LG 50PG6000 No Picture with sound, and boards seem OK
What do you mean ammarben? I see that there is not so much to check on the buffer boards, the ic´s are covered with the heatsink which is glued on the board. When I place them back and connect them to the Ysus board with or without the ribbon cables going to the display, the Vyand Vsc go again to 0V.Leave a comment:
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Re: LG 50PG6000 No Picture with sound, and boards seem OK
Hello Hamie thanks for replying,
As I initially posted, all voltages seemed to be OK, in fact they were, but when I red your message I just wanted to go back and check them again. ...this time, (besides the Zbias which is OK (100v) and of course the Va and Vs), the Vy and Vsc were 0V across the relative test resistance and around 52 compared to ground. Since I was sure that previously I had found them correct I just detached the 2 buffer boards and in fact now the voltages are again correct across the test resistances...Leave a comment:
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Re: LG 50PG6000 No Picture with sound, and boards seem OK
Hello Ltank
Thanks for taking the time to answer me. I cannot find such jumpers on the ctrl board unless you mean the two small white connection points with 4pins each (shown on the photo) but they seem to be some kind of dedicated (serial?) connections for specialized service. Nevertheless I will build a null-modem to connect to the serial db9 connector on the back of the set and try to update or even reload the firmware. Do you think there could be some chance on fixing the problem that way?
(Facing...Leave a comment:
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LG 50PG6000 No Picture with sound, and boards seem OK
Hello there.
I have the LG plasma mentioned in the title and the problem is that
the tv display will not show any image not even the menu. Thought it could be the Ysus board or buffer board or power board or Zsus board. Started from power board, changed a suspect cap. all others seemed ok. Went on to the Ysus board and also changed a blown cap 3300microF/10V with same value but 16 V. Made a general check to see if the boards (Ysus, Zsus, power board, buffer boards) were shorted by testing (ohm) between ground and input/output pins and tested each FET for shorted legs not only in... -
Re: New Members - please post your introductions here
Hello
I found this site to be very nice so I decided to apply to be a part of it (Not common for me)
Some times, even if we have sufficiently good knowledge and experience we get stuck on trying to figure out why something is not working as it should and then someone comes around with maybe a different approach to the same problem and then …”miracle”!!
Best regards to all.Leave a comment:
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