Re: zerox 22" lcd psu help
Yes, but the 100uF cap has nothing to do with your issue.
Yes, but the 100uF cap has nothing to do with your issue.
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A working TV? How boring!Originally posted by PeteS in CA -
Re: zerox 22" lcd psu help
Just replaced the main F201 fuse and the 400v cap and ive just blown the NTC201 054 ceramic cap.Comment
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Re: zerox 22" lcd psu help
Just done some reserch and the NTC201 054 that i blew is a Thermistor
im still quite new to this game.
Now im just wondering where to go from here, what to replace it with and/or where to get a replacement from.
How also can i tell what rating i need and how to check them as the only writing on the blown one is NTC 054.
Cheers guys in advance
Last edited by swampy; 06-02-2011, 05:36 AM.Comment
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Re: zerox 22" lcd psu help
Just jumper it for now, it doesn't do much except protect the mains from the spike that occurs when the primary cap is charged.
If the thermistor blew the fuse should have too. Are you sure you used the same rating of fuse? Anyway, this indicates a short in the primary. Either the primary switching transistor or the bridge rectifier.A working TV? How boring!Originally posted by PeteS in CAComment
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Re: zerox 22" lcd psu help
I deffinatly used the right fuse im thinking that the thermistor got damaged when it blew the first time around.
Im having a look through my bits and i need a 33uf 275v primary switching transistor but as of yet im only finding 22uf's and 47uf's but theres time yet.
Im wondering if the primary switching transistor is causing the tick, tick, tick sound?Comment
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Re: zerox 22" lcd psu help
Um, never heard of a transistor rated in microfarads.
That sound indicates the transistor is working but the power supply is in protection mode. That usually happens when something's shorted in the secondary side. It could also be a bad controller startup cap so try replacing that too. It's a 50v cap, usually 10 or 22uF but can be other values, next to the SMPS controller IC.A working TV? How boring!Originally posted by PeteS in CAComment
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Re: zerox 22" lcd psu help
I just got my fuses today and a new 100uf 400v cap and i replaced the thermistor that had blown.
Now my new problem is that everytime i give power to the pcb the main fuse blows? I give up
the damn thing
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Re: zerox 22" lcd psu help
Check ZD203 on the underside of the board
Also check Q201 for short
Have had both of these go on one board which caused the fuse ,thermistor and resistor R217 to blowComment
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Currently working on my ASRock 9070xt Steel Legend, and would greatly appreciate a schematic for it!09-24-2025, 03:31 PM -
Hi, I’m looking for a clean, working BIOS .bin dump (16MB) for the ASRock B450M Steel Legend motherboard.
I’ve already tried flashing the official ASRock ROM file via CH341A, but it won’t post — I believe the capsule format is incompatible.
Any BIOS version that supports Ryzen 5 2600 is fine (e.g., P2.30–P3.60).
If anyone has a working board and can dump the BIOS using CH341A or flashrom, I would really appreciate your help.
Thank you! -
Hello, could you help me with the boardview of an ASrock X670E Steel Legend? I have a project to assemble a PC from scrap parts. My last purchase was this motherboard and I want to try to repair it as much as possible. Any help is acceptable and welcome. Always grateful for the help Greetings -
Hi Guys,
I am new in electronics repairing. Do anyone have Asrock b550m steel legend schematic and boardview if can with front and back layer file?. Thank you in advance guys!...03-21-2025, 05:44 PM -
I've got an ASRock B450 Steel Legend that I'm trying to diagnose for no reaction to the power button.
The SIO receives the PWRBTN# signal and sends PSOUT#, but the CPU doesn't return SLP_S3# so nothing further happens. I have been looking around the board trying to figure out why and I happened to touch the STEP-DOWN CONVERTER NB685GQ-Z (UP10 in photo) which was VERY hot (like burn your finger). This seems to provide VDDP_S5, and indirectly, VDDCR_SOC_S5, which the CPU needs in order to handle the startup signals.
The VCC voltage powering the converter does not look right....
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