Hi all again,
I have been struggling with a main board (P/N BN94-02701G) in a Samsung LN46C630K1FXZA (no version #)TV for a while.
The problem was easy to locate but difficult to fix as one of the larger ball grid array mounted video chips had developed intermittent joints. I tried reflowing it three times which worked for brief periods of time the first two attempts.
My repair attempts are in another thread, just search for my user name: allenrw
So now I am in search of a replacement main board, P/N BN94-02701G, which is relatively hard to find...
allenrw
Member
Last Activity: 03-21-2020, 11:47 AM
Joined: 07-28-2013
Location: Richmond, VT
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LN46C630K1FXZA BN94-02701G main board replacement question
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Re: SAMSUNG LN46c630k1f video and HDMI connector fix
Didn't work out, now tv displays gray vertical lines.
Going to try to find replacement board. -
Re: SAMSUNG LN46c630k1f video and HDMI connector fix
Update to the repair:
Card failed shortly after the repair (a couple weeks) so I repeated the same process as above but used a longer curve time and higher (250c) temp.
This time it took a couple of months to fail.
When doing the heating it was always from above as the better method is to preheat from below to maybe 150-200c for the preheat and soak times then also heat the chip from above to 225c for 60-90 secs then cool.
I have a friend that has an air bath (rig to heat from bottom and hold board) so...Leave a comment:
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Re: Samsung pn50b550t2fxza
Digglr,
How did this turn out? I'm thinking of diving into another plasma project.
BobLeave a comment:
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Re: SAMSUNG LN46c630k1f video and HDMI connector fix
The video I used is here: [url]http://www.youtube.com/watch?feature=player_detailpage&v=tjWXExWM4RU[/url]
I will caution using the 250C max temp. as many manufacturers recommend max temps. of 225C.
The range tends to be 220-255C and the timing about 4-8 mins.
I used the low end of this range with the thought if it didn't work out I could raise the temp. again try again.Re: SAMSUNG LN46c630k1f video and HD...XExWM4RU[/url]Leave a comment:
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SAMSUNG LN46c630k1f video and HDMI connector fix
My Samsung LN46c630 started flickering and having vertical lines on startup a while back so I cut the jumper on the power supply that is mentioned in several places on the internet and here.
This seemed to cure the flickering but the vertical lines still appeared but went away.
Eventually the TV started getting horizontal lines that came and went when on.
I took a look at it and discovered that 2 HDMI connectors were breaking away from the PCB (this is a pretty flimsy design, be careful with them in use!)
The fix for the HDMI connectors is to resolder the hold... -
Re: tc-p50S2 10 blink SC troubleshooting
Here is the latest update, I started pricing parts and because they came from different sources including used Panasonic boards the price rose quite quickly and there was no certainty that I had found all the bad components.
I sat back and watched Ebay.
Don't you know it a week ago someone posted a SC, SU, SD board set as a new pull for $117 US delivered.
It works fine so far but I think there may be a clue as to why these boards go bad, some of the heat sinks get a bit warm so I am considering a couple...Leave a comment:
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Re: tc-p50S2 10 blink SC troubleshooting
So the price and availability of parts is now the problem.
I am having trouble finding all of them and the ones I have found are from different vendors so there are shipping costs added.
A used guaranteed board is about 120 dollars US and SU/SU boards are 12-20 dollars US.
The tv costs 500 dollars US new.
Bottom line is I need a cheaper source for the parts.
Any ideas?Leave a comment:
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Re: tc-p50S2 10 blink SC troubleshooting
The boards were out on the bench connected to the meter only and disconnected from each other.
I tried changing leads some and I don't think the results varied.Leave a comment:
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Re: tc-p50S2 10 blink SC troubleshooting
Attached are the buffer board measurements...Leave a comment:
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Re: tc-p50S2 10 blink SC troubleshooting
I'll post the buffer board info tomorrow I hope.Leave a comment:
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Re: tc-p50S2 10 blink SC troubleshooting
To recap
Q16401 shorted
Q16402 shorted
Q16421 shorted
Q16422 shorted
Q16521 not sure if it was shorted but will replace anyhow
IC16521 again not sure if it was shorted but will replace anyhow
Q16661 shorted
IC16771 shorted
Q16701 shorted
IC16773 shorted
IC16501 not sure if it was shorted but will replace anyhow
Q16702 shorted
IC16661 removing this cleared a ~500ohm path 16V_F to VAD
C16708 lost during testing, gawd these things are small and...Leave a comment:
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Re: tc-p50S2 10 blink SC troubleshooting
I wasn't aware that that list of parts was what you had to replace or I would have looked deeper.
I have read most of your repair thread now and see the sd/su tests so when I dig back into this tomorrow I'll have a bunch of things to check.
Thanks for your input, it helps me move forward and hopefully save some steps +Leave a comment:
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Re: tc-p50S2 10 blink SC troubleshooting
Thanks for the list.
I checked the other suggested devices
Q16661 shorted
IC16771 shorted
IC16724 ok
Did some poking around and not necessarily done
Q16701 or something near it shorted
IC16773 or something near it shorted
Still need to pull these items to see what exactly is wrong but it is leaving me wondering if I'm chasing a catastrophic and/or display failure here.
I really haven't analyzed what all these failures might be connected to and being there is no info about the...Leave a comment:
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Re: tc-p50S2 10 blink SC troubleshooting
tw2005 when you say "Those replacement boards " which ones are you talking about? SD, SU or SC too.
I will probably buy the replacement components for the SC board which currently stands at Q401, Q402, Q421, Q422, Q521, and IC521, it doesn't look like it will break the bank.
Then I will test it all with SD and SU disconnected and SC50 jumpered all the while monitoring the amperage on Vsus to SC. Then I'll plugin SD and SU and see what changes amperage wise, maybe bring it up with my variac to catch a high amps...Leave a comment:
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Re: tc-p50S2 10 blink SC troubleshooting
Following tw2005's advice I checked the P5V and P15V lines. P5V no shorts. P15V was .9 ohms to gnd.
I found Q521, IC521 bad (pretty sure, by resistance tests while in circuit)
Then found Q421 and Q422 shorted, so now I'm thinking what caused all this?
The VFG and VOL lines both blew their output transistors, by looking at the block diagram I don't see how they are connected to the SU, SD boards but then I'm not done investigating this yet.
Still ramping up to test the SU, SD boards and thinking that the maybe I...Leave a comment:
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Re: tc-p50S2 10 blink SC troubleshooting
Tnx for reply
This is how I tested it. also found Q401 and Q402 shorted.
"Disconnected SC and it went to 202v before shutdown but still 10 blinks.
Disconnected SC and S20 and it went to 6 blinks and took longer to shutdown, Vsus stayed at 202v before shutdown.Leave a comment:
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tc-p50S2 10 blink SC troubleshooting
Hi all,
I need a few pointers here, I have TC-p50s2 panasonic with the 10 blinks shutdown code that I think I have isolated to the SC board as high current problem but not sure.
I measured sub 1.2v, sub 1.8v, sub 5v before shutdown OK
Found SOS4 line to be odd, it went to 3v just before shutdown.
Read I should check Vsus and Vda and found Vsus to be no more than .7v before shut down.
Disconnected SC and it went to 202v before shutdown but still 10 blinks.
Disconnected SC and S20 and it went to 6 blinks and took longer to shutdown, Vsus stayed at 202v before...Last edited by allenrw; 07-28-2013, 12:56 PM. -
Re: New Members - please post your introductions here
Hi,
I'm a marine engineer that deals mostly in control and power electronics at work, at home I play with amateur radio and fix electronics as a hobby.Leave a comment:
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