I'm going to dive back into this over the weekend. Any suggestions?
thewolfe
Member
Last Activity: 11-20-2023, 06:55 AM
Joined: 09-06-2023
Location: Midwest
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Re: LG UBK90 4K Blu-Ray no power
I'm going to dive back into this over the weekend. Any suggestions?
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Re: LG UBK90 4K Blu-Ray no power
Fingers crossed you have a random odd day in the coming week or so.
I'm still trying to figure out what's wrong.
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Re: LG UBK90 4K Blu-Ray no power
Unsoldered the right side of jumper W103 (blue circle).
Checked diode D102 with a result of 057.0 Ohms & 0.087 V in selected diode test. Same reading.
Checking resistance between the solder pad of W103 that connects to IC101 (red circle) and the big capacitor CE101 (black circle) I get 0L with no change regardless of the resistance setting - new mm has an auto mode, old mm I tried 200, 2k, 20k, ......Leave a comment:
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Re: LG UBK90 4K Blu-Ray no power
I bought another multimeter (AstroAI DM6000AR) and it came in this afternoon. It's yielding similar results, 057.0 Ohms in auto, and 0.087 V in selected diode test. Same readings with both boards.
I'll try this later tonight or tomorrow.
All are reading 47.1-3 values. You're correct they're all 473.
Testing with the old mosfet and the new multimeter in selected diode test. Charging the gate (source=black, gate=red) I get a brief (1 second or so) reading...Last edited by thewolfe; 09-27-2023, 03:21 PM.Leave a comment:
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Re: LG UBK90 4K Blu-Ray no power
I've been familiarizing myself with this site and the forums, you post a lot. I greatly appreciate any slice of time you provide this thread.
Yes, confirmed, it's 054 in diode mode.
I agree that it's strange, but this is the exact same reading that I get on the working board (you'll recall I mentioned I have to of these units - I inherited a working and non-working model).
I agree, but I replaced the MOSFET (when placing an order that includes $10 shipping,...Last edited by thewolfe; 09-25-2023, 06:25 PM.Leave a comment:
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Re: LG UBK90 4K Blu-Ray no power
Thanks lotas. I'm assuming this is simply an identification and not a ... "this is probably the issue". Though, I'm considering replacing it as I'm at a loss at this point....Leave a comment:
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Re: LG UBK90 4K Blu-Ray no power
It's been a little over a week, so I've been going over this again.
I can't seem to get a voltage reading across D102.
In diode mode, it starts high 1700+ and drops to 54. In reverse, I get the same behavior (1700+ and settles on 54)....Leave a comment:
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Re: LG UBK90 4K Blu-Ray no power
Upon further review, it looks like it's actually:
3[B]S[/B]111
SK021
226LRe: LG UBK90 4K Blu-Ray no power
Upon further review, it looks like it's actually:
3[B]S[/B]111
SK021
226LRe: LG UBK90 4K Blu-Ray no power
Upon further review, it looks like it's actually:
3[B]S[/B]111
SK021
226L...Leave a comment:
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Re: LG UBK90 4K Blu-Ray no power
Cleaned with IPA, found my magnifying glass, and used my lamp - at just the correct angle, I was able to read the following:
35111
SK021
226L
Testing the following diodes using the diode setting on my multimeter:
D102 54/54
D104 554/0L
ZD101 571/0L & 571/0L
ZD102 706/0L...Last edited by thewolfe; 09-15-2023, 11:16 AM.Leave a comment:
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Re: LG UBK90 4K Blu-Ray no power
I'm committed, or is that I should be committed?
0V ... I have a cheat - I have another UBK90 and swapping power supplies works, so I know it's the power supply.
169.5V
Discharged - thanks for the helpful writeup.
0.75 with the setting at 2KOhms.
2.1 ... then works it's way down to 0 and often reading 0.2 to start.
49.3
...Leave a comment:
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Re: LG UBK90 4K Blu-Ray no power
Even with a high quality zoom, I can't seem to make out any numbers. I did find a service manual for the UBK80 which has a similar board layout when it comes to IC101, even though it doesn't show a clear picture to make out any model info:
[url]https://www.manualslib.com/manual/2490442/Lg-Ubk80.html?page=45&term=ic101&selected=1#manual[/url]
With the multimeter on 20, the voltage across CE102 is 0.59. I think I did that right.Re: LG UBK90 4K Blu-Ray no power<br ... <br /> Even...Leave a comment:
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Re: LG UBK90 4K Blu-Ray no power
I have not, my understanding is that using the hairdryer would simply determine if the caps were bad - I replaced them all....Leave a comment:
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Re: LG UBK90 4K Blu-Ray no power
I missed one datasheet (smallest cap):
Huawei (Chang) has a nice "Search by parameter" option as well for all their products:
[url]http://www.huaweiec.cn/en/product/param[/url]
I went with all Panasonic caps, and ordered:
EEU-FR1H470B - 47uF, 50V, 6.3mm x 11.2mm
EEU-FM1C102 - 1000uF, 16V, 10mm x 20mm - x2
ECE-A1CKS470B - 47uF, 16V, 6.3mm x 5mm
EEU-ED2G470 - 47uF, 400V, 16mm x 25mm - Same dimensions as the Chang "460"
...Leave a comment:
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Re: LG UBK90 4K Blu-Ray no power
I created an account to post that I have the exact same Blu-Ray player, with the same issue. It died around 12/2021. All the caps look fine.
For anyone that may stumble upon this, as I did, the capacitors are all Chang. They can be looked up at:
Although, as mentioned, the 47uF 460v cap isn't listed on the sheets (or anywhere for that matter).
In circuit, the optocoupler is giving strange readings, but I'm going to start with the adjacent 47uF 50v cap. I'll probably do as you did and replace...Leave a comment:
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