hello
can some 1 help me fix this hp530 no power ???
what i need to test and how ...
thank you
can some 1 help me fix this hp530 no power ???
what i need to test and how ...
thank you
Attached Files
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Re: hp 530 dead no power
Check voltage on R015 before and after. -
Re: hp 530 dead no power
check the r015 and mosfet with Continuity Test using multimeter
see that site How to use multimeter
http://mechatronics.mech.northwester...ultimeter.htmlComment
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Re: hp 530 dead no power
resolder the maxim chipComment
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Re: hp 530 dead no power
Hi, I have the same problem with exactly the same model of laptop, the dc jack is working fine and 19volts are present, i have a multimeter but i am unsure of how to test the individual componants on the board, i was just wondering if you ever managed to fix the issue and if anyone might have some advice ?
Thanks guys
SteComment
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Re: hp 530 dead no power
I have had a little further progress today on this, there is a MOSFET located next to R015 this was showing 18.5v on pins 1234 of the input side of the MOSFET but absolutely nothing coming out of pins 5678 and no power on the rest of the circuit after this so i am suspecting that the MOSFET is dead. The MOSFET in question is a AO4433 i have removed it from the board using my hot air station, but now i cant find a suitable replacement for it lol, Digikey and other sites dont sell this exact model anymore, unless i want 3000 of them which would be nice but i only need 1 so i have been trying to find a suitable substitute and was wondering if anyone might be able to recommend anything that would be ok for the job ? Thanks.Comment
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Re: hp 530 dead no power
Ebay has several AO4433 on sale with free shipping.--- begin sig file ---
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Re: hp 530 dead no power
Hi Retiredcaps
Cheers for the input, much appreciated i hadn't actually thought of checking Ebay but have now ordered one so many thanks :-)
I dont suppose my logic in thinking that there was voltage on one side of the mosfet and nothing at all coming out of the other side is an acurate way of testing mosfets ?
I am a complete newb at all of this in depth electronics but find it all quite interesting, i have got plenty of laptops lying around that all have some sort of power issue and i think i have the relevent tools such as hot air rework station, BGA attachments and half decent soldering iron and a steady hand i just have no idea when it comes to actually testing the componants lolComment
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Re: hp 530 dead no power
I test mosfets for shorts. See the section on mosfets.
https://www.badcaps.net/forum/showpo...4&postcount=19--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
--- end sig file ---Comment
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Re: hp 530 dead no power
Replaced PQ3 and PQ4 Mosfets all working fine now :-)Comment
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Re: hp 530 dead no power
If you use the hot air gun to remove mosfets do they melt?
I have used one before to remove a battery maxim chip and it seemed to start burning(maybe it was bad) ,since that I use a soldering iron to remove and replace mosfets.Comment
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Re: hp 530 dead no power
Thanks to this 3d, i found PQ4 shorted. Unfortunately I'll have to wait a lot for the spares.
Damn are they soldered with tungsten instead of solder?Comment
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Re: hp 530 dead no power
Nailed.
PQ4 wasn't the only thing shorted. I realized it when the new one blew up.
Found a smd cap shorted, a "big" one, 10uF 25V, PC146, just near PQ4 on the board.
What is the temperature to use with air station? It's hard to desolder those bastards...Last edited by Dumah Brazorf; 09-03-2016, 01:30 PM.Comment
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Hello!
i got a damaged Manson NTP-5561 (60V, 1,6A DC output) and and the main issue is that the controler IC for the LCD display has a short. The controler IC PIC18F87K90 is mounted on the back of the back of the LCD. Vss-Vdd = 3 Ohm. The 5V and 3,3V power line was killed as well, but that is not a problem. A new LDO 3,3V and 5V 7805 is already ordered.
Replacing the PIC18F87K90 is necessary but that makes no sense without having the HEX dump of the new controler.
Does anybody have such a power supply and could do a HEX dump of the Flash and EEPROM memory?
...04-12-2025, 10:38 AM -
Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
Hi all!
I'm trying to troubleshoot a Microsoft Surface Pro (5th gen) model 1796 that won't power on. Motherboard model is M1007506-015. My priority is retrieving data, but the SSD is integrated so it looks like if I can't repair it it'll need to go to a data recovery company. I've done a little basic board repair before, but nothing this advanced until now. So please forgive my ignorance in advance. 😅
I found the boardview for this laptop in the forums here, and am able to open it on my PC with FlexBV.
https://www.badcaps.net/forum/troubl...-hardware-devi... -
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