That’s sad. I feared you would say that.
This means giving up I guess. 😢
Thank you everyone for the contribution!
I learned a lot even though repair was not successful.
jonah1024
Member
Last Activity: 08-26-2024, 07:16 AM
Joined: 07-14-2024
Location: Bucharest
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New panel symptoms:
It started flickering now.
Main Samsung IC heats up really well as before but freezing it with air can makes the flickering disappear.
I tried doing a better job with the parts I resoldered but those new symptoms are still there.
PS: I noticed that COFS heat up really well too.
Here is video with the new symptom: [url]https://www.youtube.com/watch?v=TvoXVFQhhg0[/url]https://New panel symptoms:<br /> It...ing disappear.Leave a comment:
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I'll try to be less confusing:[LIST][*]bottom part of Inductor measures 1.8V decreasing to 1.48V stable[*]the other part of the inductor (that is also connected to the 4 capacitors) measures 1.43V going down to 1.16V[*]this in turn has direct connection with the VCC_1.05V (which measures around 1.3V decreasing to 1.02V)[/LIST]The voltages differed a bit (by about 0.1V more) If I measured using ground from chassis instead of ground pad on T-con board. That's all- I'll try to be less confusing:[LIST]
- bottom part of Inductor measures 1.8V decreasing to 1.48V stable
- the other part of the inductor
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Hmm what do you mean by random?
I will replace battery as well but all measurements are consistent, are they not?...Leave a comment:
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I soldered them back, TV is back to square 1....Leave a comment:
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It's still 1.5V if measured with the ground as chassis, 1.42V if measured with ground on the nearest ground on tcon.
The VCC1.05V pad measures 1.3V at power on and slowly decreases close to 1.05V
Yes, the main Samsung IC heats up as well.Leave a comment:
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Ok so I unsoldered all the caps and the diode next to the inductor, tested all of them and there is no short. Diode is also ok. I then tried to trace the connection and the caps are directly connected to the VCC 1.05V test pad which measured is about there (~1.02 V).
I've attached a photo with the trace.
Also, The resistance between the caps pad (or in that case the VCC1.05V pad) and ground is about 105 ohms. Is this normal?
Also, VOFF-11V is actually -13V is this normal?...Leave a comment:
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Unsoldered that coil, measured its resistance (<0.4 ohm) then soldered it back. Problem is still there…...
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I really appreciate your help and encouragement. 🙂
I will proceed with unsoldering tonight when I get back home from work. Hopefully with a steady hand 😅
Thanks!...Leave a comment:
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I doubt this is a firmware issue.
But this is what they've sent me (it’s v4.87): [URL="https://we.tl/t-i9nIJ30OSb?utm_campaign=TRN_TDL_05&utm_source=sendgrid&utm_medium=email&trk=TRN_TDL_05"]https://we.tl/t-i9nIJ30OSb[/URL]
I also asked them what could case that color aberration and they said most likely it’s the LCD glass substrate. But why would it randomly return to normal after 2week of not being used?
It’s frustrating cause I can’t find any similar symptom anywhere online.
You [USER="75051"]Diah[/USER] said...Leave a comment:
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what now? 🥹
Sharp replied today and sent me the latest mainboard firmware. I will attempt firmware upgrade again although I doubt that will fix anything.
[EDIT] Yup, nothing changed. I'm on v4.87 from v4.86Leave a comment:
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The caps measure 1.5V and dropping to 1.16V gradually and stays there .
The upper side of the inductor is wired on one side to this side of the capacitors. The other side measures 1.8V and dropping to 1.48V
The other rightmost identical inductor measures 12V on both sides and the capacitor row below it measures 14V (AVDD) and are stable
PS. I’ve sketched the connection on the picture attatched....Leave a comment:
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Will measure those caps as soon as I get back home from work.
what about HAVDD, is that ok?Leave a comment:
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[CONT]
Here are the voltage values: [TABLE="cellpadding: 0, cellspacing: 0"]
[TR]
[TD]VOFF_-11[/TD]
[TD]-13.5 V[/TD]
[/TR]
[TR]
[TD]VONE[/TD]
[TD]30.15 V[/TD]
[/TR]
[TR]
[TD]CPV1-6[/TD]
[TD]3.17 V[/TD]
[/TR]
[TR]
[TD]STV[/TD]
[TD]0.0078V[/TD]
[/TR]
[TR]
[TD]SEO_OUT[/TD]
[TD]4.96 V[/TD]
[/TR]
[TR]
[TD]VCC_3.3V[/TD]
[TD]3.3 V[/TD]
[/TR]
[TR]...Leave a comment:
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Here is an update with the voltages of the circles test points. [TABLE="cellpadding: 0, cellspacing: 0"]
[TR]
[TD]VOFF_-11[/TD]
[TD]-13.5 V[/TD]
[/TR]
[TR]
[TD]VONE[/TD]
[TD]30.15 V[/TD]
[/TR]
[TR]
[TD]CPV1-6[/TD]
[TD]3.17 V[/TD]
[/TR]
[TR]
[TD]STV[/TD]
[TD]0.0078V[/TD]
[/TR]
[TR]
[TD]SEO_OUT[/TD]
[TD]4.96 V[/TD]
[/TR]
[TR]
[TD]VCC_3.3V[/TD]
[TD]3.3 V[/TD]
[/TR]...Last edited by jonah1024; 07-28-2024, 03:09 PM.Leave a comment:
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So the shut down happens on the ext PSU because there is no current limiting, and the tv PSU is limited so the pmic don’t shut down?...Leave a comment:
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This TV was never wet and stayed always inside. I really don’t know why there is corrosion on that inductor and only there 😵...Leave a comment:
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Already did factory reset from service menu. Also upgraded firmware, no change....Leave a comment:
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With ext PSU, only one of the DC-DC seams to be heating up, the RT6939 (if I remember correctly) and the inductor next to it. It might be that the other IC shuts down as you say?...Leave a comment:
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Why though? 🤔 When the color test happens with the panel receiving only power and no data from mainboard, the defect is still there on all colors. To me this limits the problem to T-con… when T-con also receives data as well I get image, I can navigate menus and so, but everything is smudged as per pictures.
I am trying to understand the process and logic. Maybe I wasn’t clear with some specific symptoms.
Here is a new video with the defect. The background should be black and not tinted blue like that.
[url]https://youtu.be/NRPO67Wahj0[/url]Why though? 🤔 When...Leave a comment:
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