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Search: Posts Made By: stj
Forum: General Electronics Technical Discussion Today, 10:37 AM
Replies: 4
Views: 41
Posted By stj
Re: Bench testing this CPU board

the serial port(s) are clearly opto-isolated from the board,
so the serial cable has to be powering the interface.
if you arent powering that circuitry then it wont work.
also, it's obviously a...
Forum: General Computer & Tech Discussion Today, 06:54 AM
Replies: 4
Views: 72
Posted By stj
Re: PC Randomly Sleeps And Cant Be Woken

check the battery on the motherboard 1st - sometimes a low one can cause some strange shit to happen.
Forum: General Electronics Technical Discussion Today, 06:43 AM
Replies: 4
Views: 41
Posted By stj
Re: Bench testing this CPU board

first move is to dump the eprom and eeprom, and put a sticker over the eprom window.
as for the isolated port, you really need a wiring diagram of the machine to be doing this type of work.
Forum: General Electronics Technical Discussion Today, 06:27 AM
Replies: 7
Views: 43
Posted By stj
Re: Need pointers to knowledge sources for electromagnetic application

magnets lose their magnetism when they heat up - it's called currie effect.
Forum: Equipment Usage, Soldering, Techniques, and Reviews Yesterday, 06:34 PM
Replies: 3
Views: 1,422
Posted By stj
Re: B&K precision 2190 3 Channel Oscilloscope

http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=06_Misc_Test_Equipment/BK_Precision
Forum: General Computer & Tech Discussion Yesterday, 06:18 PM
Replies: 3
Views: 93
Posted By stj
Re: Black plastic goo question.

plasticiser can do that, but it shouldnt be in the air - it's toxic!
Forum: Troubleshooting Audio Equipment Yesterday, 04:26 AM
Replies: 3
Views: 74
Posted By stj
Re: Service manual for Teac A-X550?

https://elektrotanya.com/showresult?what=teac&kategoria=&kat2=all&page=2
some possibly similar stuff
Forum: Troubleshooting Game Consoles & Other Weird Devices 08-03-2020, 04:32 PM
Replies: 66
Views: 1,008
Posted By stj
Re: Ps3 fat Cechk04 no power

i use MX4 myself, anything good enough for a pc cpu will work.
as for updating, this is what you need to aim for:
https://rebug.me/

because you can put all the games on a harddrive and lots of...
Forum: Troubleshooting Game Consoles & Other Weird Devices 08-03-2020, 10:24 AM
Replies: 66
Views: 1,008
Posted By stj
Re: Ps3 fat Cechk04 no power

i know FSM - factory service mode.

i'll have to look demo mode up.
why did you want to update it?
hopefully so you can hack it with custom firmware like "Rebug"
Forum: Troubleshooting Audio Equipment 08-03-2020, 10:21 AM
Replies: 4
Views: 61
Posted By stj
Re: Help to Choose Rotary Switch for Audio Switch Box

wafer switches are still made - probably not cheap though.
a few relays and a 12v psu may work better.
Forum: General Electronics Technical Discussion 08-03-2020, 10:19 AM
Replies: 16
Views: 653
Posted By stj
Re: RT809H Universal Programmer

i'v seen similar problems recently,
chinese company's all use windows and company machines getting infected with shit is unfortunatly common.
Forum: Troubleshooting Game Consoles & Other Weird Devices 08-03-2020, 06:50 AM
Replies: 1
Views: 28
Posted By stj
Re: PS3 Turns Off When Cold but Not When Warm

well it's not the paste,
it does sound like an electrolytic cap, could also be a cracked solder joint though.
Forum: Troubleshooting Game Consoles & Other Weird Devices 08-03-2020, 06:48 AM
Replies: 66
Views: 1,008
Posted By stj
Re: Ps3 fat Cechk04 no power

that's NOT the caps causing that - bad caps would stop it running.
i dont know about demo-mode, not heard of it.
but the fan is a clue that the temps are too high - did you use silver or carbon...
Forum: General Electronics Technical Discussion 08-02-2020, 12:07 PM
Replies: 2
Views: 42
Posted By stj
Re: Has anyone used this product Photosensitive Dry Film For PCB Circuit

i wouldnt, that stuff used to be used in the days of masks and light-boxes.
it's difficult to get the board clean and smooth enough to apply.

it was replaced with pcb's with photo-sensitive mask...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-02-2020, 04:57 AM
Replies: 33
Views: 4,333
Posted By stj
Re: Thermaltake ATX supply goes BANG! - TR2 RX-750

and q5 & 6 are driven by what?
that has to be checked next
Forum: Equipment Usage, Soldering, Techniques, and Reviews 08-01-2020, 04:57 PM
Replies: 9
Views: 347
Posted By stj
Re: UNI-T UT210D/210E Digital Clamp Meter

well the way it works is each position on the rotary switch has 4 slots in the eeprom,
not all are used, but a value in a slot sets the chip mode and the mode button advances through them.

the...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 08-01-2020, 11:16 AM
Replies: 9
Views: 347
Posted By stj
Re: UNI-T UT210D/210E Digital Clamp Meter

i dont know the D version, but if it has an 0660 6000count chip, so it should be doable.
you need to search for a breakdown of the eeprom contents.

i reversed a lot of the E version with the 1106...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 08-01-2020, 07:29 AM
Replies: 9
Views: 347
Posted By stj
Re: UNI-T UT210D/210E Digital Clamp Meter

nice, you can edit the eeprom in it to get 10,000 count instead of 2000 and also change the order of stuff.
so for bench work you can have it start in DC or if your an electrician you can start in...
Forum: General Computer & Tech Discussion 07-31-2020, 10:33 AM
Replies: 4,565
Views: 704,061
Posted By stj
Re: best cheap/free scores 1.1

why didnt you just put it to one side till you could get a bunch of 330's from china or an old desktop board??
Forum: Troubleshooting Game Consoles & Other Weird Devices 07-31-2020, 10:30 AM
Replies: 66
Views: 1,008
Posted By stj
Re: Ps3 fat Cechk04 no power

unlikely, i think the boards are made in korea by Asus.

here is a pdf of what there is to find.
you need to replace them with 4 tantalum or polymer 330uf caps

it would be worth trying to find...
Forum: General Electronics Technical Discussion 07-31-2020, 05:35 AM
Replies: 16
Views: 653
Posted By stj
Re: RT809H Universal Programmer

you could delete that file if your not doing tv's with it
Forum: Troubleshooting Game Consoles & Other Weird Devices 07-31-2020, 05:15 AM
Replies: 66
Views: 1,008
Posted By stj
Re: Ps3 fat Cechk04 no power

2R0 122
although your seem to be made by nippon-chemi-con.
which is something i'v not seen before!!
Forum: General Computer & Tech Discussion 07-30-2020, 10:53 AM
Replies: 3
Views: 93
Posted By stj
Re: Black plastic goo question.

you mean it had a thin rubber coating that is breaking down?
oils can cause that - i'v seen it on everything from powertools to a thinkpad!!
all you can do is rub the crap off the plastic with a...
Forum: General Electronics Technical Discussion 07-30-2020, 05:47 AM
Replies: 16
Views: 653
Posted By stj
Re: RT809H Universal Programmer

what does the virus report say exactly.
Forum: Troubleshooting Game Consoles & Other Weird Devices 07-30-2020, 05:44 AM
Replies: 66
Views: 1,008
Posted By stj
Re: Ps3 fat Cechk04 no power

did you actually connect it to a tv yet?
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