rustytierod
Senior Member
Last Activity: 02-12-2019, 03:57 PM
Joined: 09-01-2014
Location: philadelphia pa
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did you ever get the samsung 75 to turn on ? Have exact same tv with same symptom -
Re: 55LN5700 intermittent led failure... -
Re: Backlight, Sound, No picture, UN75J6300
No, you can get to the panel ics quite easily. Tcon gets hot pretty quick, would it be possible to measure before cooking it?Leave a comment:
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Re: 55LN5700 intermittent led failure
Anyone have the service manual for this? Looked on elektronica but did not find.Leave a comment:
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Re: Backlight, Sound, No picture, UN75J6300
Yes 12v on the fuse both sides. Could melt butter in short order on replacement tcon heatsink as well. Sounds like panel ics.
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Re: 55LN5700 intermittent led failure
I'm sorry I guess I should edit that other post to say they're wired in parallel?Leave a comment:
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Re: 55LN5700 intermittent led failure
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Re: 55LN5700 intermittent led failure
After initial flash, I get 88v from both led+ to chassis ground, Vmax 10v from string that doesn't light led+ to led-. And Vmax 20v from string that flashes led+ to led-. Sometimes the back lights come on and stay on for a while until restart.
Everything coming in from main board good.
Tcon is disconnected and removed as it doesn't affect anything and the screen is off...Last edited by rustytierod; 11-23-2017, 10:40 PM.Leave a comment:
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Re: KDL-40s4100 Vertical T-con or main? (images)
Could it be the main board?Leave a comment:
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KDL-40s4100 Vertical T-con or main? (images)
This bar changes colors between green and blue, flickering intermittently.
I don't believe it's tab bonding because if I "twist" the screen on both sides there is no change and when I disconnect the LVDS cable the problem goes away immediately.
Any thoughts?
...Last edited by rustytierod; 11-19-2017, 10:19 PM. -
Re: 55LN5700 intermittent led failure
Ouch definitely no burnt up ones.
There are two pairs of leads from the PS feeding the top 4 and bottom 3 rows, respectively. Both sections are fed in series. I guess I'm going to have to suspect the driver. Saw someone with model close to this on youtube fix by reflowing transformer joints.Leave a comment:
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Re: Backlight, Sound, No picture, UN75J6300
OkLeave a comment:
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Re: Backlight, Sound, No picture, UN75J6300
UH01 and TH01 just realized there are two versions of this board. Does it really make a difference?Leave a comment:
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Re: Backlight, Sound, No picture, UN75J6300
Replaced tcon and main board, still no picture only soundLeave a comment:
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Re: 55LN5700 intermittent led failure
Ok, if it was one burnt out led or short I'd see it right? Or it wouldn't be intermittent, right? Can I reseat connector while it's on without arc hazard?
When it does stay on they ALL light up very well. Jabbing that connector (first connection from power supply) doesn't change anything.Leave a comment:
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55LN5700 intermittent led failure
What is the deal with intermittent issues? I have logo flash then off, taking apart I find the bottom 3 strip do not light. So I reseated the connector going to them and then they all stay on. Then after I get it to fail again it doesn't work.
Coincidence?
Power supply intermittently not supplying enough current? -
Re: Phillips 22 inch no power high pitch transformer noise
Would a shorted diode cause picture to fade to white over 5 to 10 min?Leave a comment:
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Re: Backlight, Sound, No picture, UN75J6300
No FRC card on this model. Don't have oscilloscope. I get a bunch of 3.2V readings on the tcon, so I know it's getting something. Even tried manipulating tab bonds to no avail. I guess it's the main. ..Leave a comment:
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Re: Backlight, Sound, No picture, UN75J6300
The heat sink is pretty hot on the tcon. Sorry hard to get pics of this beast. There is a small Crack in the top corner,, could that have rendered panel bad!Leave a comment:
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Re: Backlight, Sound, No picture, UN75J6300
Well I replaced the tcon and no change.
I also unplugged one ribbon to panel and nothing happened. Screen remained black. Even if the main was bad wouldn't I see something when unplugging one of them?Leave a comment:
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