All you wanted to know about the two transistor 5vsb and then some
Enjoy the read. 
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A working TV? How boring!Originally posted by PeteS in CA -
Re: All you wanted to know about the two transistor 5vsb and then some
Very nice! Even has equivalent ckts/current flows based on particular periods of operation.
-Paul"pokemon go... to hell!"
EOL it...
Originally posted by shango066Originally posted by smashstuff30guilty,guilty,guilty,guilty!
guilty of being cheap-made!
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Re: All you wanted to know about the two transistor 5vsb and then some
I found it to be very interesting. Thanks.Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)Comment
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Re: All you wanted to know about the two transistor 5vsb and then some
Very good document, thankyou.| AMD Phenom II X2 550BE | GIGABYTE GA-MA790FXT-UD5P | GeIL DDR3 Ultra 2x2GB 1600C7 |
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So I have a cheap non working ATX PSU that I was learning to repair a decade ago. At the time, it blew the main fuse, bridger rectifier, NTC, and primary 9A 900V MOSFET. Replaced all except the MOSFET. 5VSB came back online. Then I poked around in it so much, measuring components one by one to a point I accidentally made the 5VSB circuit primary side went bang. Blown the AP8022 (Viper22A) PWM chip, along with a low resistance resistor and the PC817 opto isolator. I replaced them all.
In the process of poking around, I also lost a zener diode that stabilize the voltage coming from... -
Hi,
Finally replaced all of the shorted 4148's and resistors and an blown tl431 on my FSP300-60GTF after 5VSB going crazy and destroying it self. Those components also made the secondary transistors appear shorted (while in reality they weren't).
Powered it on through my dim bulb tester and they (bulbs) only flash once meaning primary caps are getting charged, but that's it. No 5VSB, PS_ON voltages.
I am sure I have replaced the components correctly and that there weren't any shorted/blown traces left.
Any ideas where to go next? -
Hello
Got this speaker from a friend , defective. Power led comes on and off , in a loop.
Disassembled, got the board out, and after a bit of measuring I found a low resistance on a 5v6 line. With a bit of current I found a transistor heating up on that line (labeled T1 and 113 as on pic).
After removing this guy, I got a value of 0.7 in diode mode on that 5v6 line, which before had 0.02 or something like that.
I tested powering it up without the IC, and the speaker turns on and stays on, and works fine
Still, I need to replace this transistor.... -
hi people, i need some help to identify a transistor(q14) that is missing on the board, so the gpu has no voltage i think that q14 activate the phases for gpu, but i dont have schematic or boardview, but i think its the same transistor than q15 and q16, thanks... -
Hello everyone,
I guess I need help from the masters to try and find what is frying a 2SC5669 transistor on the left channel of this front center Amp for a NAD T752.
Was working perfectly and all of a sudden I heard a pop, and then a glow from the amp. Not only did the 2SC5669 burn a leg, but R520 which is a 220 ohm resistor partially burned - it now measures 110 ohms.
I bought this amp second hand fairly cheap as it was not working, it went into protection mode. I finally traced it down to the same transistor Q510, the one that just popped. It was shorted...
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