Re: urgent help 50pk550-so desperate here
hi nick,
photo of logic board attached
1.is the logic board is also the t-con?
2.could you please mark on the photo where is the bga chip?
thanks....
ramirachamim
Member
Last Activity: 05-09-2017, 06:53 AM
Joined: 11-10-2016
Location: israel
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Re: urgent help 50pk550-so desperate here
Veterens?
Any ideas?...Leave a comment:
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Re: urgent help 50pk550-so desperate here
yea i did and still no continuity,HOWEVER:
when looking closely underneath the ic chips, i've noticed that part of the tiny holes there looks as if something might have happend there...
ot was only on the upper buffer, the lower was flawless.
pictures attached,maybe it's worth removing the suspicious ic's heat sinks and see any signs on the top of them?
your opinions please......Leave a comment:
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Re: urgent help 50pk550-so desperate here
guys?...Leave a comment:
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Re: urgent help 50pk550-so desperate here
Ok guys,
Tested buffers( on continuity 1 lead on floating ground and the second lead racking throw PANEL connectors)
Both didnt beep for short, however lower board buffers did showed a lot of kiloohms resistances unlike the top buffers which were All on megaohms.
Any insights?Leave a comment:
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Re: urgent help 50pk550-so desperate here
Ok guys,
Thank a for you affort.
The screen never glows it is absolutly dark regardless any voltages.
Rare that panels go bad-pretty comforting..
Well the buffer board are divided, one up and one down.
The numbers are
Up or top-eax61307501
Down-eax61307601
Photos can be uploaded if neccesary.
Thank again!Leave a comment:
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Re: urgent help 50pk550-so desperate here
[QUOTE=ramirachamim;706373]
By the way,
Is there a method to checking if the PANEL is ok?Re: urgent help 50pk550-so desperate here
[QUOTE=ramirachamim;706373]
By the way,
Is there a method to checking if the PANEL is ok?Re: urgent help 50pk550-so desperate here
[QUOTE=ramirachamim;706373]
By the way,
Is there a method to checking if the PANEL is ok?...Leave a comment:
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Re: urgent help 50pk550-so desperate here
[QUOTE=Hamie;705838]OK so 2 things.
1.does the new board work?
2. Have you checked vsc and -vy voltages on the new board are they accurate?[/QUOTE
hi hamie,
checked the new y-sus board,
when z-sus is disconnected from psu.
the voltages i read in -vs and vsc are according to the label (-190,150) after minor adjustments.
so i guess it means that the new y-sus is OK and it's voltages are accurate now.
which component would be our next suspect?
thanks ...Leave a comment:
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Re: urgent help 50pk550-so desperate here
Dear hamie,
When checking the voltages on y sus, what exatly should be connected to it besides main power plug? Do i disconnect z sus?...Leave a comment:
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Re: urgent help 50pk550-so desperate here
ok guys,
the new y-sus board has arrived and installed.
unfortunatly-didn't changed a thing
now that we know that the y-sus is not the problem, any further insights please?Leave a comment:
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Re: urgent help 50pk550-so desperate here
New ysus board on its way...
I will update accordinglyLeave a comment:
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Re: urgent help 50pk550-so desperate here
Ok alastrir,
From what you wrote i understand that All igbt's and mosfets are probably fine...(will varify according to your reply with 9v battery)
If so, what else can be the problem?
I mean what would be the next step?Leave a comment:
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Re: urgent help 50pk550-so desperate here
first kind of transistors(k3667-two pieces) reads 2.014 and 1.975 megaohms
second kind of transistors(fdpf51n25-four pieces) reads 2.32, 2.04, 1.9, 2.32 megaohmsLeave a comment:
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hey hamie.
did you saw my last post? -
Re: urgent help 50pk550-so desperate here
ok.
and?Leave a comment:
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Re: urgent help 50pk550-so desperate here
well..
you are right.
i will wait to see what hamie/alasteir/nick have to say about it..Leave a comment:
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Re: urgent help 50pk550-so desperate here
hi everyone.
i am so pissed off right now!!
after busting my *** removing all igbt's and mosfets with it heat sinks out
i've just realize that all the parts which [U]appeared to be[/U] bad will cost me 7.5$ a piece!
(in my country)
i have about 10 bad components which will be about 75$ which is more expansive than a complete y brd..
now the thing is:
1.as told few posts before, i am not sure that i am correct with all of my measurements. i want to clarify that while testing the components...Leave a comment:
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Re: urgent help 50pk550-so desperate here
Alastair,if you wouldnt direct me there i'd probably throw a punch in the middle of the screen at some point
you applied hope for the darn set..thumbs up!
Now as long as the components are out i would really appreciate if you guys can pin point exatly how to test them.
As mentioned at previous post there is a lots of chips from various kinds out there and my intuition tells me i made a mistake with the reading analysis..
Please refer in your answers to each chip so i can understanding better.
Thank a lot again...Leave a comment:
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Re: urgent help 50pk550-so desperate here
alwright guys, i owe you some answers...
as mentioned after checking all of the components upon heat sinks the results are:
1)all fast reaction diodes (rs 2001 something) appears fine.
2)from 6 igbt's (30f124) 4 were bad.
3)from 4 mosfets (fdff51n25) 4 were bad.
4)from 2 mosfets (k3667) 2 were bad.
some clarifications:
a.none of the components were shorted, when i write bad i mean that when neg probing the right lag (source) with the middle (drain) i get "OL", when momentary touch...Leave a comment:
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Re: urgent help 50pk550-so desperate here
Yea it was and still is a pain in the *** however, ive read that leaving it on the board do not always allow accurate reading.
Btw guys, after removing and checking about 70% of igbt's more than 50% are faulty..
Alastair you basterd😉...Leave a comment:
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