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Search: Posts Made By: stj
Forum: Troubleshooting Power Supplies and Power Supply Design Today, 01:28 PM
Replies: 6
Views: 35
Posted By stj
Re: Power good problem in PSU all voltages seems to be OK

the big cap is probably just the plastic cover sticking up - simple test is to press down on it.
the arrow in your last pic is flux from resoldering - look above it around the 8pin chip though -...
Forum: Troubleshooting Power Supplies and Power Supply Design Today, 11:32 AM
Replies: 6
Views: 35
Posted By stj
Re: Power good problem in PSU all voltages seems to be OK

post a pic of the underside of the board,
there was a psu that was known for this problem that was on russian forums a lot - had a shorted capacitor or diode or something on the underside of the pcb
Forum: Troubleshooting Audio Equipment Today, 11:30 AM
Replies: 23
Views: 413
Posted By stj
Re: Car radio stopped working

i like to take shields off by heating them with the hot air rather than going for the solder joints
Forum: Troubleshooting Audio Equipment Today, 07:41 AM
Replies: 23
Views: 413
Posted By stj
Re: Car radio stopped working

not the cobs, i think i know what atleast one is anyway.
test the transistors and diodes
Forum: Troubleshooting Audio Equipment Today, 06:24 AM
Replies: 23
Views: 413
Posted By stj
Re: Car radio stopped working

pull the shield.
just from that picture i think it may recover just with a good fluxing and a re-heat of each joint.
though from experience with sattelite tuners i would test the semiconductors -...
Forum: Troubleshooting Computer Displays Yesterday, 11:21 AM
Replies: 12
Views: 473
Posted By stj
Re: Sony GDM-FW900 - Help Me Fix It?

if you have a scope or good multimeter you may be able to trace it by grounding the 3 inputs or linking them all together and then comparing the 3 signals as they leave each chip
Forum: General Electronics Technical Discussion Yesterday, 07:59 AM
Replies: 9
Views: 166
Posted By stj
Re: Bench testing this CPU board

strange,
also a surprise that it has a watchdog,
i'm used to them on arcade equipment but didnt expect it on something like that!
Forum: Troubleshooting Computer Displays Yesterday, 07:56 AM
Replies: 12
Views: 473
Posted By stj
Re: Sony GDM-FW900 - Help Me Fix It?

good news.
btw, your lucky to be in moscow - i think it may be the only place that still has a chain of electronic component stores!!!
Forum: Troubleshooting Game Consoles & Other Weird Devices 08-06-2020, 02:32 AM
Replies: 17
Views: 417
Posted By stj
Re: YDD Light Saber repair

most desktop computers can supply a lot more than 1A - they just link the usb ports to the psu.
sometimes they use a polyfuse, but often it's for multiple ports so you can pull 3A or more.
...
Forum: General Electronics Technical Discussion 08-06-2020, 02:27 AM
Replies: 9
Views: 166
Posted By stj
Re: Bench testing this CPU board

! means inverted,
so pins 5 & 6 should always be oposits of each other.
now you pulled the chip, try metering the resistance between holes 5&6 and the power rails - incase there is a short on the...
Forum: General Capacitor Questions & Issues 08-06-2020, 02:13 AM
Replies: 30
Views: 2,525
Posted By stj
Re: Panasonic FC series - leaking? quality gone?

there is a qualification for use in safety-critical stuff like cars called AEC-Q200.
there is also an ISO standard.
at the moment only FC passes.
Forum: General Electronics Technical Discussion 08-05-2020, 10:37 AM
Replies: 9
Views: 166
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 08-05-2020, 06:54 AM
Replies: 5
Views: 117
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 08-05-2020, 06:43 AM
Replies: 9
Views: 166
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 08-05-2020, 06:27 AM
Replies: 14
Views: 159
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 08-04-2020, 06:34 PM
Replies: 3
Views: 1,463
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 08-04-2020, 06:18 PM
Replies: 5
Views: 186
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 08-04-2020, 04:26 AM
Replies: 3
Views: 107
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: 1,096
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: 1,096
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: 7
Views: 109
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: 686
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: 47
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: 1,096
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: 60
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...
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