Re: Antec SP-500 Burned Resistor and Big Bulging Caps
Yellow X Cap looks OK . Use 1M ohms instead of 560K . Your one of the filter capacitor is bulged . You have to change that filter capacitor (changing both capacitor will be better) . There are two resistors value may be 150K or 220K or 330K parallel connected with those filter capacitors . This Filter capacitor bulged due to damage of one of the resistor . You have to check those resistor and replace them also .
By the way - Is there +5VSB present on the PSU ??
Escort Eagle
Senior Member
Last Activity: 02-17-2017, 11:54 AM
Joined: 07-21-2012
Location: Alaska
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Re: Codegen 400W PFC - 1,98 V +5VSB
First Replace the +5VSB Capacitor with new one in Secondary Side .
If the voltage is not OK by replacing Capacitor then You have a problem in Feedback Section For +5VSB . How have they managed the Feedback For +5VSB ? Can you give me a picture of the bottom side of the board ?Last edited by Escort Eagle; 10-05-2014, 10:50 AM.Leave a comment:
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Re: Trust 420W PSU DUAL FAN PW-5210 only +5VSB output
Your TL494 is switching properly . The Problem is laid after the IC to T2 Transformer . First Replace the Switching Transistors C2235 With C945/C1815 . Let's see PSU runs or not .
Still the PSU is not running then change the T2 Transformer . I think it will solve your problem . To change the T2 Transformer you must be careful that Vdd will be in side position and other two pins will connected with switching transistors . Shown in Image "IM-03" . And Primary side's Pin Continuity will also match with the...Last edited by Escort Eagle; 05-02-2014, 10:38 AM.Leave a comment:
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Re: Trust 420W PSU DUAL FAN PW-5210 only +5VSB output
I told you to replace those components .
At the time of 4+7 what is the voltage at 8 and 11 PIN ??
Check the T2 Transformer - Is it ok or not ? 1,2 & 5 will give you continuity and 3 & 4 will give you continuity . Shown in Image [B]"IM-01"[/B]
As far as I can Remember - I repaired a Power supply which Transformer was same like as yours . I can remember that power supply was not running . Every Parts was OK but PSU was not turning on !! Then I changed the T2 transformer...Leave a comment:
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Re: Trust 420W PSU DUAL FAN PW-5210 only +5VSB output
1N4148 are damaged but Surprisingly C2235 are survived !!
When you are shorting 4+7 Pins, then what is the voltage in T2 Transformer Pin ??
Replace those Components with new one . Shown in the image . Let's see what happens ....Leave a comment:
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Re: Trust 420W PSU DUAL FAN PW-5210 only +5VSB output
May be your Controller Section has gone . Specially the IC [B]AZ7500BP[/B] . Check the voltage on IC PIN [B]4, 8 [/B]& [B]11[/B] in both state (AZ7500BP). Check the two switching transistors (C945/C1815)- are they ok or not . And check T2 transformer's PIN voltage in both state . I think most probably your IC [B]AZ7500BP[/B] has been damaged . This is why your MJE13009 has blown .Re: Trust 420W PSU DUAL FAN PW-5210 only +5VSB output
May be your Controller Section has gone . Specially the IC [B]AZ7500BP[/B]Last edited by Escort Eagle; 04-28-2014, 09:55 PM.Leave a comment:
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Re: Epower EP-600NE-XV Shuts down intermittently
I also think so - it could be heat related . Is your Fan Moving Fast ? It also could be happen due to weakness of Two big Primary Caps or Secondary Output caps .
What [b]Kaboom[/b] said is also important . Are you getting +5VSB when it is shutting down ??Re: Epower EP-600NE-XV Shuts down intermittently
I also think so - it could be heat related . Is your Fan Moving Fast ? It also could be happen due to weakness of Two big Primary Caps or Secondary Output caps .
What [b]Kaboom[/b]...Leave a comment:
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Re: One more cheapy psu with +5vsb output only
Yes, It is better decision to stop working with this PSU now . Because without Proper Inductor you can not fix the Voltage problem .
I have attached the Datasheet of LM7912 . You will easily understand How and Where to be connected the Regulator by watching the Datasheet .
My advice is - Keep This PSU for later time or use it's parts to repair other Damaged Power supply ....Leave a comment:
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Re: One more cheapy psu with +5vsb output only
I have replace Inductor Just one time . So, I did not observe about the thickness of Inductor . Just Now I have watched the thickness as follows :
1. +5V is the most thicker . (Some PSU used Double wire)
2. +3.3V and +12V are almost same . (Some PSU used +3.3V more thicker wire than +12V. But Old PSU used +12V thicker wire than +3.3V)
3. -12V is less thicker than above other .
4. -5V is the Lowest thicker than all other wires .Leave a comment:
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Re: One more cheapy psu with +5vsb output only
You should give another try by Replacing +5VSB resistor From 22.11K to 1K . I think PG will be OK at Load time !!...Last edited by Escort Eagle; 04-13-2014, 02:34 PM.Leave a comment:
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Re: One more cheapy psu with +5vsb output only
Use a LM7912 Negative Regulator . If it works then well, otherwise keep it for using it's Parts .Leave a comment:
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Re: One more cheapy psu with +5vsb output only
1. Remove those three Connections From PCB . [Shown in "SS-03"]
2. Then Connect those Two Pins with a Jumper . [Shown in "SS-03"]
Lets see what happens .......Leave a comment:
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Re: One more cheapy psu with +5vsb output only
It has been created a big Problem by changing the Inductor !!!
Is that original Inductor Totally unusable ??? Do you not have any same PCB ??
Another Way - From which PCB have you taken that Inductor ? Can you give me a Picture of that PCB ? I mean - If the Output Volt rails (+12V, +5V and +3.3V) of that Main Transformer from which you have taken the Inductor are similar with this Problem PCB's Main Transformer Volt rails, then you can replace this Transformer with That Main Transformer . Because this Inductor is...Leave a comment:
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Re: One more cheapy psu with +5vsb output only
Does it working with 4.5K Only ?? Is it not working with 3.3K or 1K ??...Leave a comment:
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Re: One more cheapy psu with +5vsb output only
PSU is working . It means You have a Load failing Problem of +5VSB Resistor .
+12V is decreasing to 6V . What about the Other Volts ?? Are they OK ??
Before changing the Inductor Change the 4.5K Resistor with original value 1K and watch what happens ....Leave a comment:
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Re: One more cheapy psu with +5vsb output only
I do not understand What is the [B]OFF_State[/B] and [B]ON_State[/B] voltage in the Output !!!!!
What do you mean by that !!!!!! 
Your Output is increasing because You have changed the Inductor . New inductor is not matching with original one . New Inductor has different turns than original one . This is why 12V is going to 12.9V, 5V is decreasing to 4.94V and -12V is increasing to -19V .Re: One more cheapy psu with +5vsb output only
I do not understand What is the [B]OFF_State[/B]...Leave a comment:
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Re: One more cheapy psu with +5vsb output only
This is a exceptional totally disgusting design . Because of this design Every PSU creating the same problem in that same Point . Change that +5VSB Resistor with a new one and increase it's value at 3.3K and 1/2 Watt Resistor . Lets see what happens !!!...Leave a comment:
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Re: One more cheapy psu with +5vsb output only
No, PSU running does not depend on Thermistor's resistance . And 6 ohms resistance of Thermistor is OK .
When you are shorting PIN 4 With PIN 7, then what is the Output voltage showing +12V, +5V and +3.3V and -12V ?...Leave a comment:
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Re: One more cheapy psu with +5vsb output only
I hope those Diodes and Transistor are OK . Shown in "SS-01" .
Why don't you remove that +5VSB Resistor . Shown in "SS-02" . If it favors the Luck, then it could be run again like previous one !!...Leave a comment:
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Re: Another one psu with only +5vsb output
Hahahahaha ................. Very Interesting !! I have no idea what happened !! I am shocked too ..... !!Leave a comment:
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