HP 635 AMD continuous restarting now 1 blink

[Th3_uN1Qu3]

Have this one in, and it already pissed me off to no avail. It's got a soldered-on APU, AMD E-450.

When it came in it would just reboot by itself every 10-20 seconds. I reballed the APU - same behavior. I then reballed the only other chipset on the board - what AMD calls the "FCH". It worked and stayed on no problem.

I assembled the notebook and stupor. It did not work anymore, caps lock blinked 1 time, then long pause, then blinked again, which 1 blink is "CPU error" according to HP, but it's never caused by the CPU in my experience. Got it to power on once more, then it just did this 1 blink and that's it, that's all it does now.

Took the board apart again and reflowed both chipsets one more time. Absolutely no change. This is ridiculous...

Board is "chicago_br_hpc mv_mb_v2". I could not find a schematic for it, if you have one, please share. Also a BIOS dump would be nice, as i only found it on a Chinese website.

[highpulse]

Re: HP 635 AMD continuous restarting now 1 blink

FCH are commonly a failure , especally on some toshiabs with the AMD cpu core sodlered on baord . this FCH after replace solve does problem with turn on off issues , as also image related problems in my experience

[Th3_uN1Qu3]

Re: HP 635 AMD continuous restarting now 1 blink

I thought so as well. I can buy the FCH locally, but at around the same price i can get a board with water damage to harvest for parts. What would you choose?

[hazardus]

Re: HP 635 AMD continuous restarting now 1 blink

Why do people believe after reball everything just will work fine?

[Th3_uN1Qu3]

Re: HP 635 AMD continuous restarting now 1 blink

Why do people believe after reball everything just will work fine?

Because most of the times it does.

The percentage of actual bad BGAs is low compared to the percentage of poor quality boards, poor quality solder, and of course improper operating conditions. That excluding the whole nvidia thing, of course...

For example with the RS880M/HD4250, i've done at least a couple dozen of them, and i've only found TWO bad chips so far. Both due to gross overheating.

[Th3_uN1Qu3]

Re: HP 635 AMD continuous restarting now 1 blink

The FCH chipset was out of stock locally, but i managed to source an identical board with liquid damage (coffee) for $14. Actually, i got the whole bottom case, palmrest in good shape, heatsink and fan, keyboard with 1 missing key, speakers, and battery along with it! No repairs had been attempted on this board however i found many shorts, so i did not try repairing it. I lifted the FCH chipset off this board, reballed it and soldered it on the first board (the one with 1 blink and no display).

She's up and running now. The FCH replacement fixed it.

I'm installing Windows on it atm, will be back with pics.

[spidey]

Re: HP 635 AMD continuous restarting now 1 blink

i think the schematic is this one:


https://www.badcaps.net/forum/showthread.php?t=39334

and the bios :

http://1bios.ru/bios/notebook/hp/com...rio-cq57-399er

[Th3_uN1Qu3]

Re: HP 635 AMD continuous restarting now 1 blink

Nope, that's the Intel version. This one is with AMD APU soldered onto the board.

[Th3_uN1Qu3]

Re: HP 635 AMD continuous restarting now 1 blink

Pics or it didn't happen. The first pic with the FCH chipset is after reballing the original one, i couldn't be bothered to fill up the space with those pics too - since it didn't work. Notice the before-last pic, look closely and you will see a different datecode on the FCH, it's the one i pulled from this other board that i bought. And hey, what do you know, it works.

[magneh]

Re: HP 635 AMD continuous restarting now 1 blink

Very nice job!
Well done

[Th3_uN1Qu3]

Re: HP 635 AMD continuous restarting now 1 blink

Thank you. Now that i look closely at that pic i pointed out above - that's nicely roasted coffee all around the FCH die. Yeah that coffee spill on the donor board was pretty serious. Couldn't be arsed cleaning it all off - the contact side is all that matters.

[magneh]

Re: HP 635 AMD continuous restarting now 1 blink

Thank you. Now that i look closely at that pic i pointed out above - that's nicely roasted coffee all around the FCH die. Yeah that coffee spill on the donor board was pretty serious. Couldn't be arsed cleaning it all off - the contact side is all that matters.

Eheheh xD

And when the FCH will warm up, maybe there will be that little coffee aroma getting out of it LOL Seems good to me!

Just kidding, really nice skill on troubleshoot and reballing technique

Keep up the good work!
Cheers

[sparker1]

Re: HP 635 AMD continuous restarting now 1 blink

I feel like flying to Romania for some lessons..........and some of that beer.

[dj_ricoh]

Re: HP 635 AMD continuous restarting now 1 blink

I feel like flying to Romania for some lessons..........and some of that beer.

If you go ask for URSUS hehehehe :p

[Th3_uN1Qu3]

Re: HP 635 AMD continuous restarting now 1 blink

^^ Lol no. Timisoreana is where it's at.