I am working on a hitachi tv power supply and it has 2 domed caps. They are 3300f, 100v. The ESR measures ok but the capacitance is around 2000uf on one cap and 2400uf on the other. With 20% tolerance, wouldn't these both be considered bad.
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Re: Domed Capacitors
I thought it was 10% tolerance not 20% but the dome gives it away they are bad anyway. -
Re: Domed Capacitors
Yes, this is a common failure on some Hitachi PSUs.
I have heard that if these caps are left bad for too long, buffer failure may result.
I cannot understand how this could happen but it's a good precaution to take anyway, don't run the set for longer than needed to test before replacing those caps.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Domed Capacitors
thanks guys. I didn't have the tv on that long since I noticed the caps as soon as the back cover came off. I thought the ESR would be way out but it was 0.10, which isn't too bad. I think they should be around 0.04 ohm.Comment
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Re: Domed Capacitors
Replace them and check the Y buffer as well.Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
https://www.facebook.com/Telford-Tel...7894576335359/Comment
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Re: Domed Capacitors
Ok I replaced the caps and the TV still shuts down. I didnt notice this before but when the power/screen comes on there is a vertical bar down the right side of the screen. its only there for a second. Here is a screenshot of the line. Could be Y buffer or sustain board causing the line.
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Re: Domed Capacitors
that's nice, i hope it's not a burned buffer chip with the rubber on the pins!Comment
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Re: Domed Capacitors
It seems that when I power up the tv, it shuts down after a few seconds. I do get VA and VS voltages for a few seconds when everything is connected as well as my other voltages. The standby LED is red then goes blue for a few seconds then flashes blue after. When I remove the ribbon cable from the logic board(see pic), I can power it up and the power stays on for about 20-30 seconds then shuts down. The light stays solid blue during this time. Could the logic board be causing the issue or the X SUS since this logic ribbon cable goes from the logic to the X sus board.
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Re: Domed Capacitors
Could be bad Vscan voltage, that is low on power up. This can cause buffer damage if logic voltage still present due to SCR latch up. Or could just be maldischarge.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Domed Capacitors
I found the problem. One of the Y buffer boards had a short on it.Comment
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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
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(N.B. #2 : I could not find a 3300 microF aluminum-polymer with a higher voltage
than 6.3 V.)
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I replaced capacitors with aluminum-polymer.
3300 microF/6.3 V. x 4 replaced by 3300 microF/6.3 V. (KYOCERA... -
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it has inside:
2 x 47uf 16v caps 105c branded as Su'scon (lol sounds sus to me)
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After all of... -
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I have a 2007-era Panasonic VHS combo that is full of of Elna RJG capacitors. I am trying to test the capacitors to diagnose the machine and then select replacement capacitors but I can not find any datasheets for them. I did find a Elna catalogue from 2007-2008 but there is no mention of this capacitor series. Where these specially made for Panasonic and so not made available to the public? Any ideas what to find out what the ESR values should be without the datasheets? They are all between 10V and 50V and 47uF and 1800uF. None are leaking or bulged but I know that they need to be tested to be...
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