Thanks for the reply. the Teapo cap is a 105c but still 2nd tear. I have seen what damage can occur when that main input caps fails.
I know which brands are good. My question was more or less asking what series would be a suitable replacement. Normally i compare the ripple current rating and ESR. But the LS spec didnt seem to list and ESR for this cap.
Rgyver2
Member
Last Activity: 01-23-2024, 08:07 PM
Joined: 05-20-2012
Location: Kannapolis, NC
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Cougar BXM850
Just picked up a working Cougar BXM850 PSU.
Noticed that the main input cap is a Teapo LS (420V 560uf).
appears to be a date stamp on the cap of 09/19 - so is likely to be a bit over 4 years old.
any recommendations for which cap to use to replace this LS cap?
Teapo LS spec sheet shows 1600 mA ripple (30x50mm) for this cap. last time i changed a main input cap i used a Rubycon MXK
i am still looking this over and dont see any other signs of concern. but if someone knows this PSU and has any other recommendations for components to replace, let me know. (secondary...Last edited by Rgyver2; 01-22-2024, 02:14 AM. -
Re: Antec EA-430D 5VSB issue
Just wanted to give an update to let everyone know that the power supply is now fixed.
Ultimately the main issue was the main 450V ( 270uf Aishi) cap. I replaced it with a Rubicon MXK 450V 390uf. And i replaced the TNY278 IC ( blown due to bad main cap). Now the 5VSB works and the power supply runs without issue.
Thanks again for everyone's helpful comments and insight. I learned a lot and now have a deeper understanding of how it works. And would not got this far without the help to theorize and understand what was ha...Leave a comment:
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Re: Antec EA-430D 5VSB issue
Thank you Momaka for answering my questions. and I greatly appreciate the advice on the replacement cap. the original cap was a 450V so I already planned on 450 to 500V.
Unfortunately 25mm diameter is the max without running into other components in that space. event the original cap was 22mm and had some yellow tape around the bottom. I am guessing as extra insulation. the cap had 85 on it so i believe it was a 85C. I always go with 105c replacements caps when possible.
Thanks for the info on the incandescent assisted testing,...Last edited by Rgyver2; 04-30-2021, 02:45 AM.Leave a comment:
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Re: Antec EA-430D 5VSB issue
yes i had previously for shorts but didnt see anything unusual. but also not having a schematic, it was not exactly precise checks.
Thanks to Linuxguru's link about APFC, i believe i figured out the issue, or at least main issue with the power supply.
Now that I have a basic understanding of the role of the main cap, i thought that must be it. If the main cap (C1) Aishi 450V 270uf has greatly reduced or no capacity, then it will not absorb the discharge of the coil. Therefore allowing the voltage to increase to the point that...Last edited by Rgyver2; 04-29-2021, 04:55 PM.Leave a comment:
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Re: Antec EA-430D 5VSB issue
Thanks
the avalanche diode would be the DZ901 correct? -- also i mistakenly said in a previous post that the diodes were anode to anode. they are actually cathode to cathode. (i confused the orientation from front to back)
What components would make up to APFC boost circuit? And what would you suggest i check first?
also does anyone have a schematic for this power supply? or even a generic ones that would apply to this model?...Last edited by Rgyver2; 04-27-2021, 11:58 AM.Leave a comment:
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Re: Antec EA-430D 5VSB issue
Update
i checked the 5vsb filter cap (Nichicon 10V 1000uf PW(M)) it read 990uf and esr 0.25 - 0.30 ohms. (esr read with cheap Chinese meter - Data sheet for PW list 0.068 ohms (z) at 20C) i only saw one filter cap for the standby power.
i replaced the TNY278PN with TNY278PG (278PN out of stock until Oct maybe) from the spec sheet, the only difference i saw between N and G was the lead finish.
put all the original tested components in with the new IC (TNY278PG). power it on for one second (to make sure nothing goes...Last edited by Rgyver2; 04-27-2021, 08:17 AM.Leave a comment:
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Re: Antec EA-430D 5VSB issue
update
both of the diodes seems fine.
D901 read OL c to a and 270k ohms a to c - diode checker shows 0.515v drop fwr bias. only visible markings are "26" possibly B or D first, K or A second, 26 then 5 or E too much outer damage to figure it out. but seems to read fine, so will keep for now.
ZD901 - read OL c to a and 299k ohms a to c - diode checker shows 0.545v drop fwr bias. R J's post helped me realize i mistakenly called it a zener where I believe it actually is a TVS diode.
C901 - Nichicon 220uf cap read 208uf...Leave a comment:
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Re: Antec EA-430D 5VSB issue
Thanks.
The Diodes had numbers but do not appear legible now. The zener may be ok but the D901 shows some heavy heat damage on the side next to the ICs D pin that burned off. D901 may be ok, but with it showing heat damage, i figured best to replace it.
The C901 is a Nichicon 220uf 35V PW(M) with no physical sign of damage. But i will test it to see if it needs replaced.
I just was not sure if the the root cause was a failed IC or associated component....Leave a comment:
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Re: Antec EA-430D 5VSB issue
From what i have seen, the "D" in the model number - EA-430(D) - means it is a Delta version.
From what i can tell, the rest of the Power supply seems to be Ok. But will not truly know until i can fix this 5VSB and further test.
Anyone have an idea yet on what i need to order to replace the two diodes?Last edited by Rgyver2; 04-18-2021, 04:13 PM.Leave a comment:
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Antec EA-430D 5VSB issue
I have an Antec ea-430d that will not turn on due to a problem with the 5VSB circuit. the TNY278PN has a burn "drain" pin (pin 4) and the two diodes (D901 and ZD901) near it look burnt with black on the board. (they were covered in that white goop which i removed).
The TNY278PN needs replaced and likely the 2 diodes as well. I found the TNY278PN, but need to know what to order to replace diode D901 and the zener diode ZD901.
From reading other posts, it seems wise to also replace the large 450V 270uf cap.
The diode info and any other advice of what else to... -
Re: LG 42LB5610 BackLight problem.
I fixed my back light p-dim issue.
i replaced the power board - LG EAY63071901 - (circuit board rev was a 2.0 (same as original) and white label rev was 4.1 (original was 4.2) (first replacement power board i received was older, 1.9 vice 2.0)
with the new power board everything worked fine. eco mode and low back light percentage no longer made the back light turn off. I tested by running the back light down to 10% with a p-dim value of 0.34 vdc and the back light stayed on.
My best guess is that the original...Leave a comment:
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Re: LG 42LB5610 BackLight problem.
I have an LG TV 42LB6300-UQ that has the exact same power board. My back light was completely bad. 8 strips total, 7 read shorted and one read open - via LED back light tester. i replaced the entire back light ( 32 6v LEDs (4 A strips and 4 B strips, 4 LEDs per strip)). all was fine until back light would still turn off after a few minutes - with new back light. (p-dim related issue)
I found that the back light voltage was stable at 200VDC until the p-dim value went below 0.7vdc. then even when p-dim when back up, the back light would...Leave a comment:
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