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Search: Posts Made By: madan1
Forum: Troubleshooting Power Supplies and Power Supply Design 03-01-2019, 02:15 AM
Replies: 44
Views: 506
Posted By madan1
Re: SMPS low Vout

Bought another top247 and this time it worked.
The odd thing is that the faulty IC reacts normally to all resistance tests...
Thank you for the assistance, I really appreciate it!
Forum: Troubleshooting Power Supplies and Power Supply Design 02-25-2019, 02:40 PM
Replies: 44
Views: 506
Posted By madan1
Re: SMPS low Vout

Everything was on the board ( just soldered wires on the primary winding and connected them to the power supply ).
I added above and the readings for c663 ( ~7V ).
On the secondary side there are...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-25-2019, 02:01 PM
Replies: 44
Views: 506
Posted By madan1
Re: SMPS low Vout

Ok, so 14V@0.6A through the daylights module connected straight to the transformer ( still on the board ). See the attached image for the input waveform.

So, first of all - lot's of hi-pitch noise...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-25-2019, 11:29 AM
Replies: 44
Views: 506
Posted By madan1
Re: SMPS low Vout

I will check again the diodes and will also see if there is a way to temporary convert the board to manual on/off smps ( schematics for this top247 application could be found in its datasheet ).
...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-24-2019, 07:32 PM
Replies: 44
Views: 506
Posted By madan1
Re: SMPS low Vout

Removing d703 did not make any change
Shorting pins 3 and 4 on the optocoupler also did not change anything.


I just injected ~6 and 8.2 volts on ground and ic651.1. Both times the voltage on...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-24-2019, 06:06 PM
Replies: 44
Views: 506
Posted By madan1
Re: SMPS low Vout

Thanks for reminding me - just scrapped a cap from an old pci lan card. After I installed it, the V on c661 went down to 0.2v ( was 0.36 ) and on c663 - 0.3V ( was 0.47 ).

Just checked the diodes...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-24-2019, 04:00 PM
Replies: 44
Views: 506
Posted By madan1
Re: SMPS low Vout

I see, so even without any feedback from the optocoupler, the ic651 should be doing its thing?

For the c663, for ground I used the negative leg of c661 and pin 4 of the optocoupler, for the...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-24-2019, 02:17 PM
Replies: 44
Views: 506
Posted By madan1
Re: SMPS low Vout

Just got back to that PSU.

On ic651.1 - 5.27V
ic652.3 - 5.27v
ic652.4 - 0.47
c663 - 0.47
t651 between 9 and 10 - 0vDC and 0vAC(@50hz )
c661 - 0.36
Forum: Troubleshooting Audio Equipment 02-24-2019, 11:26 AM
Replies: 7
Views: 158
Posted By madan1
Re: Beats Solo3 wireless headphones

Check the usb plug for stuck rubbish.
Forum: Troubleshooting Audio Equipment 02-24-2019, 11:23 AM
Replies: 7
Views: 1,144
Posted By madan1
Re: Onkyo tx-nr509 receiver no power

Some of those onkyos behave like that when the back plate is removed. It is used to distribute ground through the boards and without it they just do not want to start.
Forum: Troubleshooting Power Supplies and Power Supply Design 02-20-2019, 08:47 PM
Replies: 44
Views: 506
Posted By madan1
Re: SMPS low Vout

I'll see if we have any of those cards in the office, but yes - it's one of the smallest smd ceramic caps.
Either way, I'll get one of those.. just probably will wait to collect a decent list of...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-20-2019, 07:08 PM
Replies: 44
Views: 506
Posted By madan1
Re: SMPS low Vout

With d661 removed:
c661 - 0.07V
ic651.1 & ic652.3 - 5.2V
ic652.4 - 0.35v

secondary side:
c707 - 0.01v
c708 - 0.05v
c709 - 0.1v
Forum: Troubleshooting Power Supplies and Power Supply Design 02-20-2019, 06:36 PM
Replies: 44
Views: 506
Posted By madan1
Re: SMPS low Vout

You are totally correct.
Indeed the pins are reversed.. I got it wrong because on the schematics the IC pinout is mirrored.
So on IC652.3 and IC651.1 there is 5.2V.
On IC652.4 - 0.5V
On c661 -...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-20-2019, 06:15 PM
Replies: 44
Views: 506
Posted By madan1
Re: SMPS low Vout

Yes, right - c661 - 0.4V
For the measures on the primary side I used for reference the negative pin of c661 ( I do not know if the term in English is "hot ground" ).
I hooked the scope to the...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-20-2019, 05:12 PM
Replies: 44
Views: 506
Posted By madan1
Re: SMPS low Vout

I also thought the same about the 20V rail, but was not sure.
D661 works as a diode when tested by DMM and external power supply, what other tests I can do?
I also injected 16volts on c661 and got...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-20-2019, 03:42 PM
Replies: 44
Views: 506
Posted By madan1
Re: SMPS low Vout

for the octoC
when using the positive probe on pin 3 and negative on pin 4 I get between 120ohms and 38k
when the positive probe is on pin 4 and the negative on pin 3 - 60ohms - 10m
the values...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-20-2019, 02:57 PM
Replies: 44
Views: 506
Posted By madan1
Re: SMPS low Vout

I tested all elements from the TOP247 circuit with an external power supply and did not find any leaking diodes or caps.
The resistors checked with DMM and again - all read fine.
Just tested and...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-19-2019, 10:13 AM
Replies: 44
Views: 506
Posted By madan1
Re: SMPS low Vout

I guess I was looking at this:
"In addition to the 47 μF CONTROL pin capacitor, a high
frequency bypass capacitor in parallel may be used for
better noise immunity."
I will try to find one, but...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-19-2019, 10:05 AM
Replies: 44
Views: 506
Posted By madan1
Re: SMPS low Vout

Will a simple DMM resistance test show the leak?
Forum: Troubleshooting Power Supplies and Power Supply Design 02-19-2019, 08:23 AM
Replies: 44
Views: 506
Posted By madan1
Re: SMPS low Vout

I checked them with "transistor tester" and by "higher capacitance" I mean like 50uF and ESR 0.38 ( real values for c654 ), when it should be 47uF.
This is the only electr. cap in the TOP247...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-19-2019, 04:58 AM
Replies: 44
Views: 506
Posted By madan1
Re: SMPS low Vout

It's an old PSU indeed, but all caps are nichicon, I have desoldered some of them and they all read fine ( even more than what is stated on their labels ).

Unfortunately I'm still not able to fix...
Forum: Troubleshooting Game Consoles & Other Weird Devices 02-15-2019, 11:15 AM
Replies: 9
Views: 185
Posted By madan1
Re: PS4 Launch Model Disk Drive Issue (disc drive no power won’t accept discs)

Post some photos of the ps mainboard and the BR drive board.
Also from what I've read, some ( or probably all? ) bluray drives are matched to the mainboard, which basically means that you can not...
Forum: Troubleshooting Audio Equipment 02-14-2019, 06:02 AM
Replies: 12
Views: 272
Posted By madan1
Forum: Troubleshooting Game Consoles & Other Weird Devices 02-10-2019, 10:36 PM
Replies: 9
Views: 194
Posted By madan1
Re: BENQ mp720 projector

Well, I got the projector with a "new lamp" ( original philips ) according to the seller. The lamp indeed has nice white flood light, no flickering or spots. The bulb housing looks fine and has no...
Forum: General Capacitor Questions & Issues 02-10-2019, 01:27 PM
Replies: 919
Views: 391,603
Posted By madan1
Re: The Hall of Shame - Badcaps Photo Montage

if this means that the gif is not accessible, here - have a zipped avi :music:
Showing results 1 to 25 of 303

 
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