I was just wondering if it is safe to use good main filter caps from my power supply boards that I have collected. to replace bad Leakey ones. I hate to waste half decent parts.
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Re: Reusing main filter capacitors
I reuse them all the time, even crappy brands last a long time. I have a big stock pile of 820uF 220V Elite caps that I use in PSU rebuilds and they usually measure +/- 5% tolerance even when really old -
Re: Reusing main filter capacitors
P4 do you have an example of where to grab a main f. cap. to replace one of a 19" monitor? (82uF-100uF)Comment
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Re: Reusing main filter capacitors
Oh my apologies didn't realize this was for displays. Same applies although I think primary caps are more likely to fail in displays because there isn't much ventilation. As long as you have at least the same capacitance and voltage, preferably 450V, it should be fine. Make sure the cap will fitComment
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Re: Reusing main filter capacitors
Oops sorry if I wasn't clear about what kind of power board yes they are for lcd monitors
I only replaced one main cap in the year I am repairing monitors. I tested a couple that I saved and they test good. So I guess I will grab some more out of my junk box and save the good onesComment
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Re: Reusing main filter capacitors
If you're in the USA and the LCD monitor does NOT have Active PFC, you can use 200V caps in place of the 400V caps. This will allow you to re-use some input caps from ATX PSUs (provided you can find some with small enough capacity... you don't want capacitance much higher than the original caps because that can cause some problems too).Comment
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Re: Reusing main filter capacitors
^ Yes, you are right. I shouldn't have assumed it had APFC!Comment
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Re: Reusing main filter capacitors
I don't live in USA..Comment
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Re: Reusing main filter capacitors
I seem to find them valuable, especially the Japanese ones which are within tolerance.
The less-known brand ones (provided the capacitance measures within tolerance) find their way into less demanding applications, such as valve/tube equipment which does not use a switching power supply.My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.Comment
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Re: Reusing main filter capacitors
In that case, you have to use strictly 400V or 450V caps. With APFC, 450V is recommended.
Only in countries where the line voltage is 110 VAC can 200V caps be used, again provided there is no voltage boosting of some sort on the caps. IIRC, a non-true sine wave UPS may cause problems too.Comment
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I suppose the real question is whether the existing pinouts from ether a 17IPS71 psu are cross compatible with a 17IPS12 psu? If they are then the exchange of the main boards should have no issues providing the screen is compatible with both main boards. Obviously you can change the screen configurations easily enough (providing you have the correct files) for the main board. Why may you ask would I do this? Well a lot of the smart features are no longer working on a Hitachi 48HBT62U main board I wish to give it a new lease of life!
Obviously the same LVDS connector for the screen connection... -
Hi everyone,
Iām looking for help with a persistent issue on an LG TV model 55NANO77SRA, which uses the main board EBU66792103 (also used in LG UQ80 and NANO75/NANO80 series).
š§© Problem Summary:- The TV keeps scrolling through the menu or selecting items by itself.
- I removed the physical button board (the entire panel with power and volume buttons) and also disconnected the flat cable (CN202) from the main board.
- The remote control is not in use (batteries removed), and the TV still shows the same behavior.
- I
07-28-2025, 08:34 AM -
Hi, I have some 32 bits computer motherboards that need repair, as they fail to
power on.
Here are some examples :
(N.B. "capacitors" indicated here are electrolytic capacitors located in the onboard
switching supply area).
(N.B. #2 : I could not find a 3300 microF aluminum-polymer with a higher voltage
than 6.3 V.)
1 - Motherboard #1 : this is an Asrock K7VT2 (socket A) that still works well. To put it on test
I replaced capacitors with aluminum-polymer.
3300 microF/6.3 V. x 4 replaced by 3300 microF/6.3 V. (KYOCERA... -
I know I've been a little scarce lately (like the last 2-3 years), but I'm still here and still doing my thing with fixing PSUs.
For today's considerations, I have a Seasonic B12 BC-550 [A551bcafh] 550 Watt ATX power supply for you (click on links for full size images).
https://www.badcaps.net/filedata/fetch?id=3591771
https://www.badcaps.net/filedata/fetch?id=3591772
It's a modern ATX unit with fixed (non-modular) cables and an 80-plus bronze certificate. Here's the label:
https://www.badcaps.net/filedata/fetch?id=359177... -
Hi everyone,
Im looking for some advice regarding my Samsung UE55MU8000 TV with main board model BN94-11606C. The TV suddenly stopped turning on and now shows no signs of life at all not even the standby light at the bottom.
Initially, I suspected an issue with the PSU, so I took it to a repair center. They tested it and confirmed that the PSU works perfectly, even on other TVs. Based on that, I started investigating the main board.
I disconnected the main board from the PSU, and the backlight turned on, which seems to confirm the main board is the issue....
Comment