Re: Samsung PS-50C96HD - No picture - help needed
Thank you for the comprehensive response that pointed me in the right direction.
I remembered having a bit of trouble connecting the cable from the Logic Board to the Y-Drive board. I opened the connector and carefully reseated the cable. It had been taped down at a slight angle so was tricky to fit.
This is hard to admit but I made a basic rookie error. As I checked the board I spotted...... I had not connected the power connector! WHY? I have no idea.
[B][U]IT WORKS!!![/U][/B]
...
Paul-G
Member
Last Activity: 01-13-2014, 07:02 PM
Joined: 11-17-2013
Location: Devon
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Re: Samsung PS-50C96HD - No picture - help needed
The miserable saga continues. The power board was damaged in transit. Thanks for nothing City Link! The nice people at [URL="http://www.lcd-plasma-parts.co.uk"]EMOS[/URL] sold me a board from one of their test sets. Cost £45 + VAT + P&P = £59.98. BONUS, when the package arrived they had also included the missing lead from the power to logic board. That has saved me a LOT of hassle.
No picture? The set now seems to be working but I can not get anything on screen.
[B][U]What I see[/U][/B]...Leave a comment:
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Re: Samsung PS-50C96HD - No picture - help needed
While waiting for a response I did some digging in the Service Repair manual and found that Vs should be 205V. SMPS board faulty as well!
The manual just says to replace the board. There are various kits available but I am unsure which to go for so I contacted EMOS who repaired the Y boards. Sending the PSU to them but doubt it will be back for Christmas.Leave a comment:
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Re: Samsung PS-50C96HD - No picture - help needed
Not what I was expecting.
Va stable at +65.2
Vs varied and was not stable.
See the attached image of the notes I made during this....Leave a comment:
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Re: Samsung PS-50C96HD - No picture - help needed
I have reassembled and put the power lead on hold so I could do the diagnostic requested.
Plug in power lead, Blue light on, relay click, Blue light off. Light on for about 3 seconds. Same result with Y-MAIN completely disconnected.
As it was a few weeks ago I am now unsure what I originally saw.
Is this normal behaviour? Is it possible that getting power to the logic board will now generate a picture?Leave a comment:
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Re: Samsung PS-50C96HD - No picture - help needed
A thought while work is on hold. Does anyone have a spare lead to go between PSU CN807 and Logic Board CN2000?Leave a comment:
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Re: Samsung PS-50C96HD - No picture - help needed
I have the set in bits at the moment trying to solder a 10 core strip of floppy drive cable to the 2 connectors. Not the best solution but it should work. It is somewhat delicate so needs to be secured against vibration induced solder joint failure. I am having some trouble due to the fiddly nature of the job coupled with the eye sight of a near 60 year old.
I am going to call it a night today as I have other commitments this evening.
Once the lead is fitted I will try your logical suggestion and post...Leave a comment:
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Re: Samsung PS-50C96HD - No picture - help needed
That thought had occurred to me seeing it was there before starting all of this.
Any idea what to check for on that one?Leave a comment:
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Re: Samsung PS-50C96HD - No picture - help needed
OK (or NOT!!!).
If you look at the overall wiring diagram attached, the thick Black line (7) goes from what I believed was a test point to the Logic Board. The $!*&# lead is not there!
I know the previous owner said someone looked at it but this is just stupid.
I will have to remove the Main Board to get to the Logic Board to try to work out which pin goes to which. I can also dig in the Service Manual that the attached image came from to work it out from there.
I do...Leave a comment:
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Re: Samsung PS-50C96HD - No picture - help needed
There appears to be a test point connector on the bottom right of the PSU board. The readings are as follows. Using a mounting screw as a ground for the DVM reading VDC.
STBY = 5.12
VS-ON = 0.00
N.C. = 0.00
PS-ON = 0.526
RTN = 0.00
5.3V = 5.36
RTN = 0.01
RTN = 0.01
5.3V = 5.36
5.3V> = 5.36
Edit for typo...Last edited by Paul-G; 12-11-2013, 11:15 AM.Leave a comment:
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Re: Samsung PS-50C96HD - No picture - help needed
The connection from the PSU board goes to the top right of the Y-MAIN board. It is connected and the fuse is OK.
I have checked the other fuses which are also OK. I can see no missing connections - all sockets on the PSU have leads plugged into other boards.Leave a comment:
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Re: Samsung PS-50C96HD - No picture - help needed
Am I surprised? Parts returned and carefully fitted. [B]NOTHING[/B]!
Power lead plugged in and a single click from a relay. No blue light as before and NOTHING on pressing the on/off button on the front or the remote.
Where do I go from here? Christmas is rapidly approaching and time for repairs is getting precariously short.Re: Samsung PS-50C96HD - No picture - help needed
Am I surprised? Parts returned and carefully fitted. [B]NOTHING[/B]!
Power lead plugged in and a singleLeave a comment:
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Re: Samsung PS-50C96HD - No picture - help needed
I [B]HATE[/B] Royal Mail!
Parts posted 1st Class 21/11 which should be a next day delivery. Turned up at repairers today! I had expected to have them back last week.
I have arranged for the parts to be returned by City Link.
Now waiting.......Re: Samsung PS-50C96HD - No picture - help needed
I [B]HATE[/B] Royal Mail!
Parts posted 1st Class 21/11 which should be a next day delivery. Turned up at repairers today! I had expected to have them back last week.Leave a comment:
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Re: Samsung PS-50C96HD - No picture - help needed
OK, I took the easy route. I have never dealt with surface mount components and only have a basic soldering iron. Too much room for problems to creep in.
The parts, Y-MAIN + SCAN boards will be in the post in the morning. 1 week turnaround.
I will update when the parts are returned and installed. Wish me luck.Leave a comment:
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Re: Samsung PS-50C96HD - No picture - help needed
Thank you for that.
I am weighing up the cost/risk options. I have a feeling that my limited abilities will send me down the [URL="http://www.lcd-plasma-parts.co.uk/index.php?route=product/product&product_id=8490&search=LJ92-01491A"]Repair Service[/URL] route at a cost of £120. I could do it cheaper but this way a major user error factor is removed. If I fail in replacing parts and do more damage requiring further parts/replacements the time/cost escalates quickly. After all, I am trying to get this...Leave a comment:
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Re: Samsung PS-50C96HD - No picture - help needed
Cost saving due to limited budget? The Y-MAIN SCAN(LOW) tested OK, if I can buy a Y-MAIN SCAN(HIGH) at a reasonable cost then I could try replacing any duff 88N30Ws.
How do I go about testing the 88N30Ws? If one or more are duff, will there be other components as well?Last edited by Paul-G; 11-19-2013, 06:28 PM.Leave a comment:
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Re: Samsung PS-50C96HD - No picture - help needed
While I can replace the 88N30Ws I do not have the necessary kit to remove the buffer chips which is frustrating.
I have to go with replacement parts or a repair service. Recommendations?Leave a comment:
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Re: Samsung PS-50C96HD - No picture - help needed
While waiting for a response (no dig intended) I have been doing a bit of research.
Quite a few people recommend replacing both buffers and the main at the same time. Parts are not too common in the UK which is frustrating.
eBay has some but research warns against these as they may be salvaged from damaged screen sets and the screen damage probably causes shorts that take out the buffers at the same time.
Parts from China are available at a cost plus a 30 day shipping delay. Can I trust parts...Leave a comment:
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Re: Samsung PS-50C96HD - No picture - help needed
The good and bad news.
The Y-MAIN SCAN(LOW) board read OL on all pins = good.
The Y-MAIN SCAN(HIGH) board had non Open Circuit readings on most pins = bad.
I uploaded a video of the meter readings while testing the pins on the outside of the CN5401 connector. Most are other than Open Circuit. [URL="http://youtu.be/4xVM6HYemkQ"]http://youtu.be/4xVM6HYemkQ[/URL]Re: Samsung PS-50C96HD - No picture - help needed
The good and bad news.
The Y-MAIN SCAN(LOW) board readLast edited by Paul-G; 11-19-2013, 11:19 AM.Leave a comment:
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Re: Samsung PS-50C96HD - No picture - help needed
Your video? LOL!
From the video it looks like the pin furthest from the middle connector. Off to test so back in a while.Leave a comment:
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