Hello, I need help figuring out what chip came unattached from my motherboard (Asrock Z390 Taichi). I found a picture online of the chip. However I cannot find a boardview or a high resolution picture to identify what it was.
My assumption is that it is a buffer logic 74LVC1G125GW. judging by a Z270 Taichi boardview I found but not really a fan of smoke testing parts.
Any and all help is appreciated - Thanks
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mouuse25
Member
Last Activity: 04-21-2022, 08:43 AM
Joined: 02-12-2015
Location: Lewis Run
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Re: LG 60PA550-UG (No Video/Audio)
Thanks Nick's Tvs you have been very helpful all your advice has been greatly appreciated, I have ordered many parts from fastpartsnmore they are a great company to work with and I did end up replacing all 3 boards at once with no change to my results
WeadroW I know the exact problem you are having and all I can say is that changing my y-sus or the logic board does nothing different...does your set prime with each board connected individually? -
Re: LG 60PA550-UG (No Video/Audio)
Y-sus: EBR73712701
Z-sus: EBR73733601
UP-buff:EBR73710601
LO-buff EBR73731801
I did replace the logic board with a used one from ebay..said it was good but idk how to test it
If I leave everything plugged in except the logic to y-sus ribbon cable nothing happens I hear the power supply click but I get zero reading at the vsc or vy test pointsLeave a comment:
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LG 60PA550-UG (No Video/Audio)
Here is my old post to set the scene up to the point where I'm at now
[url]https://www.badcaps.net/forum/showthread.php?t=51702[/url]
I finally have the set priming and i'm getting a vsc and vy reading that stay consistent...how ever the vsc in reading 140 and it should be 180 and the vy is reading 180 and it should be -150....what can cause this?https://Here is my old post to set t...y reading that -
Re: LG 60PA5500-UG Plasma, No Picture
sorry about my hiatus I ordered all new boards to prevent me from taking up to much of the board members time ..and as everyone who has ever ordered anything off ebay soon find out that it turns into a complete mess trying to receive packages 3 out of 6 packages came in broke had to reorder more etc..etc..
I tried what Nick's Tvs said and I get nothing at all even with new buffers the set does not prime at all, I am getting no VSC to the buffer boards it just fluctuates
so here is where I stand now...
...Leave a comment:
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Re: LG 60PA5500-UG Plasma, No Picture
Okay I just discovered something strange that may be able to help to track down the issue
-I disconnected the X-sus completely and left it disconnected
-Then disconnected the Y-buffer boards from the Y-sus main panel
-Then before plugging the tv in I placed my dmm (+) probe on the vsc test point and (-) dmm probe to chassis ground
-When I plugged the tv in the the dmm showed 65 volt...Then is slowly dropped to zero across about a 2 minutes span
- I let the tv sit unplugged for...Leave a comment:
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Re: LG 60PA5500-UG Plasma, No Picture
I can't get a clear reading it just keeps changing the voltage between -5 to 12 volt I tested each vsc pin I could and tested the vsc test pointLeave a comment:
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Re: LG 60PA5500-UG Plasma, No Picture
That's actually a good question being that it's such a easy thing to over look... I just checked all the screws and cable connections then attempted to power it on but nothing changed...thanks for the mind set since I tend to overlook the obvious rather easily lolLeave a comment:
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Re: LG 60PA5500-UG Plasma, No Picture
Yeah I've used a DMM live before I have 600v gloves to protect myself...Last edited by mouuse25; 01-24-2016, 12:02 AM.Leave a comment:
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Re: LG 60PA5500-UG Plasma, No Picture
How do I test that?Leave a comment:
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Re: LG 60PA5500-UG Plasma, No Picture
Pn: EBR73733601
After removing the board I couldn't get transistors to short out so it may have been a error on my behalf that I thought they were shorted out...I used this method to test them
[URL="https://www.utm.edu/staff/leeb/mostest.htm"]https://www.utm.edu/staff/leeb/mostest.htm[/URL]
and to determine the diodes from the transistors I assume the transistors have a board location number that start with "Q" and the diodes start with "D" such as the example below...Leave a comment:
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Re: LG 60PA5500-UG Plasma, No Picture
Thanks Nick's Tvs, well you may be correct with out taking the board off the tv I did a quick test and it seems that I do have a shorted transistor but the fuse seems fine...I'm going to remove the board to do further testing...would you recommend replacing the whole board or just the individual transistor/s?Leave a comment:
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Re: LG 60PA5500-UG Plasma, No Picture
Thanks freakaftr8, I pulled the upper buffer and it showed 206 vdc it actually went up a volt might be might common but it did show voltage...Im sure the screens fine when the issue started i could get the LG logo to come up it just went away after a few minutes...Thanks for the help this has me clueless where to go from hereLeave a comment:
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LG 60PA5500-UG Plasma, No Picture
Hello everybody, I really need this TV fixed. Any and all help is greatly appreciated
-I tried using the search engine but no one else's problems seem to line up with mine
-I know my screen is good because I have seen the LG logo come up since the issues started
-If I leave the set unplugged for days the sounds works for a little bit, just no image
-I replaced the Y-sus board, and logic control board (because is was cheap)
-checked the Va: 55, Vs:205, VZB: 120 and the main is 5 volt
-disconnected the upper... -
Re: 60" LG Plasma 60PA5500 (Sound but no Image)
Thanks for the response... I tried disconnecting the buffer boards already with no luck ...wish mine was that simple lolLeave a comment:
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Re: 60" LG Plasma 60PA5500 (Sound but no Image)
I checked voltage on my tv
VA:55
VS:205
VZB:120
Now here is where I run into a problem...when I connected my tv today I no longer have sound and on my main logic board I have a green blinking light...plus I have no back light...I attempted to check my VSC and VY and they just jump all over the place and I can not get a reading...can anyone lend me some insight on what may cause my VSC and VY to do that?Leave a comment:
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Re: 60" LG Plasma 60PA5500 (Sound but no Image)
is there any place online I can download a service/ repair manual so I can check for voltage?Leave a comment:
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Re: 60" LG Plasma 60PA5500 (Sound but no Image)
I have a capacitance meter as well if neededLeave a comment:
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Re: 60" LG Plasma 60PA5500 (Sound but no Image)
yes I doLeave a comment:
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Re: 60" LG Plasma 60PA5500 (Sound but no Image)
Sounds good, Thanks for the replyLeave a comment:
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