Re: Samsung PN60F5500, making me question my sanity
Sorry. On this TV (like mine) the X and Y sustain function are actually on the same board. Maybe "mainboard" was wrong term to use since people associate that with the input board or control board. Lets call it the X/Y sustain board then.
But try the advice of freakaftr8 first. Again, I'm just an amateur who's only fixed 2-3 TV's so far....
mtnickel
Member
Last Activity: 12-30-2020, 02:27 PM
Joined: 01-30-2017
Location: Surrey, BC
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Re: Samsung PN60F5500, making me question my sanity
If you were wrong on your blinking from before then the LED may be showing a fault.
If it is in fact a quick blink every 4-6 seconds, this indicates that it's detected a fault and turns off the voltages (as you experience them going down).
If that is the case, I would try the X/Y mainboard next. I had the same blink fault (every 5-6 seconds) and the mainboard solved it. Again, check for some sellers and see who allows returns. Sometimes helps to email ahead and ask and say you're swapping boards and wonder if they...Leave a comment:
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Re: Samsung PN60F5500, making me question my sanity
Did you try turning TV on with all cables connected properly and the 3/4 service pin jumpered? (instead of removing power to the mainboard).
If so, what was LED blink like?Leave a comment:
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Re: Samsung PN60F5500, making me question my sanity
20 ohms could possibly be normal. I'm no circuit expert, but on mine, the dead transistors were a dead short. One would likely have to look at the traces, see what it's driving, etc. Maybe others with more experience can chime in.Leave a comment:
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Re: Samsung PN60F5500, making me question my sanity
Pictures?
Testing in circuit is usually ok. Is it a dead short (less than 1 ohm?). Also, I know on my board some parts looked like transistors but were just diodes. Could you read the number on their face?...Last edited by mtnickel; 02-15-2017, 04:18 PM.Leave a comment:
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Re: Samsung PN60F5500, making me question my sanity
On my newer samsung board (F series) board, the sustain board connected to the PS only has VS, VA, ground, and 15v. So in fact, the mainboard is actually supplying 5V to sustain boards (if it requires it), not vise-versa. So I maintain you probably need to power the Mainboard from the PS for that to work in this case.
On that samsung I've been playing with, I could only get a test pattern by jumpering the PS_on manually. This would turn the mainboard on to give a steady blinking LED. Without the jumper,...Last edited by mtnickel; 02-14-2017, 03:43 PM.Leave a comment:
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Re: Samsung PN60F5500, making me question my sanity
Blinking every 1 second indicates the mainboard status is ok. So an overload fault may be less likely.Leave a comment:
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Re: Samsung PN60F5500, making me question my sanity
By "a slow Blink", do you mean once every 5-6 seconds?
Mine did this too. It's an indicator of a fault. Some i think have said Drv reset.
Also, on the pn51f8500 I've been testing, to get the test images, the mainboard needs power. I know Hamie recommended to remove the power to the mainboard, not sure why. If that board doesn't get power, how will it fire up it's CPU and generate the test images?
But I wouldn't worry about generating test images since we know you know have a slow blink....Leave a comment:
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Re: Samsung PN51F8500AF continually clicks
I can plug the mainboard in without clicking...but only with a manual jumper keeping the PS on (PS_on jumpered to ground). Without the jumper the TV will only click on/off right away (when using the power button or remote). But the test images are encouraging regarding knowing the panel works, and likely the sustain and buffer boards are ok (but small chance of a false fault being sent? bad temp sensor?).
Wondering now if it's maybe the PS still. I did some testing on the Standby Line:
1) the...Leave a comment:
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Re: Samsung PN51F8500AF continually clicks
Could it have anything to do with the power supply if it has a weak standby voltage?
I measured again and it requires 20mA (not 2) from ps_on to ground to turn it on. Normal still.
I measured the standby voltage and when I hit the power button, it doesn't stay a steady 5v, it drops to 3 very briefly during the click where it's trying to power on. (By briefly, I mean like an instantaneous drop coinciding with the click). Maybe the mainboard isn't getting enough juice from the standby line to go through proper power...Leave a comment:
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Re: Samsung PN51F8500AF continually clicks
Keep in mind that jumper is on the same mainboard (it's not separate mainboard and control board like some). It's an all-in-one. Would it not be possible that it's a signal reporting back to the mainboard that won't allow it to start it's turn on procedure?
As I said the mainboard does have a steady flashing green light when PS_on is forced on. Makes me think it's running correctly, but an input to the board is causing it to turn off. Guess it's worth another try. Replacement boards are like $150USD which...Leave a comment:
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Re: Samsung PN51F8500AF continually clicks
Update: got a replacement mainboard.
It responds to the power button, but only clicks on then off. Just a fraction of a second.
But now when I force PS_On with a jumper, the board will actually power up and flash green led nice and steady (1 second apart). This also brings VS_on from the mainboard, yet I can't get any images to come up, no menu, no input change, no volume, etc. I do see the screen come on black now.
ALSO! if I force PS_on with the service jumper (pins 3/4 connected) I get all...Leave a comment:
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Re: Samsung PN60E530A3F - Clear sound but no picture no blink cold or warm same
we need pics of your control board to show how to do that.
on samsungs you jumper pins 3/4 on the 4 pin connector. On some, they are just 4 round traces on the board.
I believe you also have to disconnect the mainboard connector going to the control board. Speaking of connectors, you were sure they were all well seated properly. Could be an improper connection somewhere.Leave a comment:
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Re: Samsung PN51E6500DF won't display any image. Diagnostic advice requested
Ok, X/Y main board arrived and I threw it in. SUCCESS!
I was concerned as it still did not have any startup sound. I think perhaps the feature just may be turned off. Or even the speakers may be turned off as a soundbar was in use instead. Crazy too that the power supply has no physical relays. So plugging this thing in resulted in absolutely no sound. haha. But picture and screen up and running. Happy camper here.
Board was only $15US shipped too which is a nice t...Leave a comment:
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Re: Samsung PN60F5500, making me question my sanity
my 51" is a similar design to this being an F6500. On mine, I found 4 mosfets as dead shorts on the x/y sustain board. some call it just the Y sustain, but it's labeled X/Y on it I think and on many sites. I'd probe some of the FETs on it for shorts. I just got mine today and will see if it resolves the issue.
I too tried manually jumping the connections (and did get voltage, both VS and VA) but the control board still showed a fault (long blink). I think if the control board doesn't power on nicely with 1...Leave a comment:
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Re: Samsung PN51F8500AF continually clicks
Sigh. 1 step forward, 2 steps back. I didn't realize in my connections I had mixed up my left and rights on one of the pins for 5v. So during my first test i was sending 5v down a line that required 15v. That didn't harm anything, but I then put test probes into the back of the plug for the 15v connections (to keep separate from the 5v in front) and then I applied 15v to the same pin which sent 15v to the entire 5v system.
So my first test was probably a fail and didn't really check the 5v system since it was perhaps trying...Leave a comment:
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Re: Samsung PN51F8500AF continually clicks
EDIT: irrelevant now.
Well, I powered all the 5V lines. Is there a reason not to test the 15v Lines as well?
What I did was use a phone charger type thing which was about 1amp max. Hooked up it drew about .75Amps and dropped the voltage to around 4.7v.
Attached are pictures of the components to heat up first.
The marking is: N5 over BN.
From looking through mouser, I figured it's this SMD package: SOT-89-5
Anyone know how to identify it further? Perhaps try and source...Last edited by mtnickel; 02-05-2017, 12:45 AM.Leave a comment:
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Re: Samsung PN51F8500AF continually clicks
Thanks for the tips guys! I did 3 years of engineering before switching to business, so it's fun to get back to my roots.
I've got an ebay search alert for a mainboard should one come up. They are NLA and supply for these high end plasmas is not plentiful.
I don't have a variable supply, but could see how big of a potentiometer I have (may have an audio based 8 ohm one that will handle a bit of current). Otherwise, I feel it'd be risky using the PC power supply directly as they can provide...Leave a comment:
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Samsung PN51F8500AF continually clicks
I acquired a pn51f8500AF from a local guy. He had troubles with it and sent it out to have the Power supply fixed. put the power supply in and still didn't work so he cut his losses and gave it to me.
First I have disconnected everything from the mainboard and power supply and just connected the power supply to the mainboard. It still just clicks over and over about 1 second apart. All the voltages (even standby) are going down to 0v and then flicking on for a brief second. (all low voltages (5s and 15s) come up for a momentary second, but drop quickly back to 0).
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Re: Samsung PN51E6500DF won't display any image. Diagnostic advice requested
On the Y-main board i've found 2 Transistors that are a dead short.I didn't remove them from the board and test. I marked the IC Type on the heatsink where it is. One started at 7ohms and quickly went to 0 (gate to drain, source to drain was dead short always). The other was a dead short across all three, but again, that's with circuit in place.
Should I start with replacing this Y-main board? Anything else I can check? didn't find any dead shorts on the Power supply board.
...Leave a comment:
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