Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
Announcement
Collapse
No announcement yet.
User Profile
Collapse
-
Happy New Year everyone!! Please be informed that I was able to remove the unknown chip by using a pre-heater and wait for the PCB to heat up until around 150C. But the weird thing is, up until now, I'm still confused as to what part is this. Though I highly suspect it is a diode because it can light up the LED when ever i probe on the forward bias (possibly) and LED wont light up when reversed. The odd thing is that I could not see any voltage drop on both forward and reversed bias. The only indicator i can say is lighted LED. Need your expert advise on how can i test or prove what component...4 PhotosLast edited by dennis_elx33; 01-18-2024, 02:03 AM.
-
Re: UV LED Device Repair
Hello All,
One more problem is that i could not remove it using 2 soldering iron and even with the use of low temp soldering lead..
Also, tried to use a hot air blower but all unsuccess to remove.
And to make things worse, it is so fragile that even poking slowly by a tweezer, it breaks!
Any suggestion on this?...
Leave a comment:
-
Re: UV LED Device Repair
Hi harp, really sorry for the very late reply. Been to other more urgent projects. Anyway, i have a photo attached here. As for your suggestion, i will try to do it. Thank you so much!
Hello eccerror, i couldn't identify if its parallel or series but the unknown devices (black color) are all open reading....Last edited by dennis_elx33; 11-08-2023, 06:38 AM.
Leave a comment:
-
Re: UV LED Device Repair
Hi stj, sorry for the very late reply..
I measured the unknown component using diode mode but there is no reading at all even forward and reversed bias. So do you think it is a special device instead of a diode?
Leave a comment:
-
Re: UV LED Device Repair
Hello stj, yes, the leds are in series.
What is the best way to check this unknown component?Last edited by dennis_elx33; 08-23-2023, 07:48 AM.
Leave a comment:
-
UV LED Device Repair
Hello Guys,
Part Name: UV LED 365nm
Problem Statement: LED intensity low
I am repairing a UV LED lamp device. Found to have multiple burnt devices though I cannot identify what is this. Highly suspect that it is a resistor or a diode but i could not fully identify it because both resistance and diode test got OL result.
Is there anyone here who knows what is it? or how can i test it?...
-
Need Help on SMPS Power Supply Load Testing Failure..:(
Hi Guys!
I am a beginner in electronics repair. This time I tried to repair an SMPS power supply with 4 outputs 24VDC (10A), 5VDC(10A), 12VDC (4A) and 12VDC (4A) due to intermittent power on/off. After series of checking, I found some few capacitors with high ESR and replaced those with good spares. Now the power is stable and output voltages are all good. But whenever I load test atleast 2A, the voltage drop on outputs 5VDC, 12VDC, 12VDC respectively. The original 5VDC when there is a 2A load becomes 1.3VDC, and the 2 outputs with 12VDC becomes 5.4VDC. However, when I load 8A on...
-
Re: Unidentified Capacitor
hi rj and stj, I already install the capacitor X7R series MLCC capacitor to replace the obsolete AVX cap. And guess what, my PS already can power up normally and with load test pass! Thanks guys for helping me out! Cheers!!!...
Leave a comment:
-
Re: Unidentified Capacitor
hi stj, thanks for your idea..anyway I tried to buy the mlcc cap with 220nF/630V rating because I cannot find the exact part online.. I will inform u guys later whether pass or fail after I install the part and do the testing.
Leave a comment:
-
Re: Unidentified Capacitor
Hi RJ, ok I will try your suggestion. Thanks a lot!
Leave a comment:
-
Re: Unidentified Capacitor
Hi RJ, I guess so..I'm still waiting for AVX's reply on my inquiry email. Still hoping they will reply by this week.
Leave a comment:
-
Re: Unidentified Capacitor
Hi Stj, the model is pfhc-2600..thanks
Leave a comment:
-
Re: Unidentified Capacitor
Hello stj! Yes, this is lambda power supply. Thanks in advance.
Leave a comment:
-
Re: Unidentified Capacitor
Hi RJ, Thank you very much for your idea and for this datasheet. Anyway, I already sent email to AVX and still waiting for their reply. I will update you the result later. Thanks again!
Leave a comment:
-
Re: Unidentified Capacitor
Hi RJ,
Kindly see the actual photo of the pcb circuit. Yes, I will try to contact AVX about this. Its 220nF so by conversion its 0.22uF. Thank you very much for the suggestions....
Leave a comment:
-
Re: Unidentified Capacitor
Hi Stg, thanks for the reply..i will just try to find other options.
Leave a comment:
-
Re: Unidentified Capacitor
Hi Stj! Thank you very much for the idea. Having said that, do you think i can use any ordinary ceramic capacitor to replace this one? It seems that this cap got special characteristic because the packaging type (8-pin DIP package) is not same with any ordinary caps. Though i don't have any datasheet to confirm. Hope to hear from you again. Thanks in advance!
Leave a comment:
-
Unidentified Capacitor
Hi Guys,
I am an electronics tech repairing power supply and other elex devices. It happened that I repaired 1 lambda power supply and found 1 capacitor burnt. I compared it with 1 good unit and was able to get the top marking of it. But the problem is, I cannot find any information/datasheet of the said capacitor online. I tried to source and ask electronic store online like digikey but all got negative response as they cannot find any info about it also. I tried to measure the good cap from other unit and it measures 220nF on board. The top marking is AVX CDM-22-0169744A. I hope...
No activity results to display
Show More
Leave a comment: