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Old 01-18-2018, 05:43 AM   #1
MagicSmoke
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Default JVC tv Power Supply Caps Question

Received a free JVC tv, would not power on. Testing revealed startup cap for stby volts bad, a 1uf 50v Lelon electrolytic. Replaced the one cap and all is good, tv now works.


My question is would it be a good measure to replace all of the caps on the psu, it has a mixture of Nichions and Lelons for more longevity? It was manufactured in 2008.
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Old 01-18-2018, 06:39 AM   #2
Andrew F. Ali
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Default Re: JVC tv Power Supply Caps Question

If you have an ESR Meter you could probably check ALL the e-caps on the PSU and if they are doubtful then replace them, as preventative maintenance. However, if your set works why interfere with it, running the risk of cracking joints, installing caps wrong, shorting joints or breaking the board. My advice, Let sleeping dogs lie.
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Old 01-20-2018, 10:44 PM   #3
sam_sam_sam
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Default Re: JVC tv Power Supply Caps Question

Or you take the view that any cap that under 100uf replace it just because the small diameter caps dry out faster than the bigger ones do

Now if were me and the caps brands that have a tendency to be bad and ones that you replace on site when you see them ( Lelons ) for me this is a brand when I see them I replace them

Most of the time I just recap it and be done with it

But I would not be in a hurry doing this job for the reasons given by Ali in the post above
__________________
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Desk Top Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *


These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

1 Over Head Crane Current Sensing Board
2 Hem Saw Computer Stack Board

All of these had CAPs POOF
All of the mosfet that are taken out by bad caps

Last edited by sam_sam_sam; 01-20-2018 at 10:53 PM..
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Old 01-21-2018, 12:10 AM   #4
MagicSmoke
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Default Re: JVC tv Power Supply Caps Question

There are only 5 of the Lelons on the board. The rest are Rubycons, or UCC.


I think I will replace the lelons and leave the others alone. Have done other cap replacements so no problems there. Thanks.
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