EEVblog Electronics Community Forum

EEVblog => EEVblog Specific => Topic started by: EEVblog on April 04, 2018, 09:59:24 pm

Title: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
Post by: EEVblog on April 04, 2018, 09:59:24 pm
Repair of a HP Envy 23" Touch PC found in the dumpster.
Blank screen and doesn't boot. Troubleshooting and repair to getting it booted again.

Re-edited from the EEVblog2 channel video, with new happy-ish ending.

https://www.youtube.com/watch?v=Jjv1ETu89vY (https://www.youtube.com/watch?v=Jjv1ETu89vY)
Title: Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
Post by: BillyO on April 05, 2018, 03:23:52 am
Dave, your troubleshooting skills are top notch.  :-+  :-+

That was a joy to watch.
Title: Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
Post by: W2NAP on April 05, 2018, 05:39:39 am
that was a good one for sure. A+

sadly i have notifications on, never get notified. never get notified about any vids on channels i have the "bell" on
Title: Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
Post by: PetaVolt on April 05, 2018, 06:00:48 am
Young player question, please be gentle...

Dave used a "current supply" to power the LED backlight; what was the purpose of using a current supply as opposed to a standard bench supply in constant current mode? What am I missing?
Title: Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
Post by: EEVblog on April 05, 2018, 07:06:35 am
Quote from: PetaVolt on April 05, 2018, 06:00:48 am
Young player question, please be gentle...
Dave used a "current supply" to power the LED backlight; what was the purpose of using a current supply as opposed to a standard bench supply in constant current mode? What am I missing?

I didn't know what the compliance voltage was, it could have been (and was) over 30V, so I used a my 100V capable CC supply right off the bat.
Title: Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
Post by: Brumby on April 05, 2018, 08:14:46 am
Quote from: BillyO on April 05, 2018, 03:23:52 am
Dave, your troubleshooting skills are top notch.  :-+  :-+

I'm a bit harder to please.  I wanted him to sort out the backlight driver.
Title: Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
Post by: BillyO on April 05, 2018, 12:57:35 pm
Quote from: Brumby on April 05, 2018, 08:14:46 am
I'm a bit harder to please.  I wanted him to sort out the backlight driver.

You should watch more ElectroBOOM on YT ... sparks inevitably fly.
Title: Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
Post by: janoc on April 05, 2018, 02:33:16 pm
Quote from: BillyO on April 05, 2018, 12:57:35 pm
Quote from: Brumby on April 05, 2018, 08:14:46 am
I'm a bit harder to please.  I wanted him to sort out the backlight driver.

You should watch more ElectroBOOM on YT ... sparks inevitably fly.

Nah, that is a LED driver, those are low voltage, so not likely to get much of a spark. Old school CCFL driver on the other hand ...
Title: Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
Post by: tocsa120ls on April 05, 2018, 04:28:32 pm
Nice fix! Also there is an update for the miniPro and the TL866 too, might want to upgrade them. Helped me fixing a few bugs, and an Overcurrent message when writing 27C eproms.
Title: Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
Post by: thm_w on April 05, 2018, 07:16:12 pm
Dave managed to confuse half of the youtube commenters that can't figure out how to read the description :palm:

Quote from: W2NAP on April 05, 2018, 05:39:39 am
sadly i have notifications on, never get notified. never get notified about any vids on channels i have the "bell" on

I don't know why people bother with notifications, I just check subs page once per day: https://www.youtube.com/feed/subscriptions (https://www.youtube.com/feed/subscriptions)
Title: Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
Post by: seb30 on April 12, 2018, 05:47:46 pm
I had done this before, flashing BIOS with external programmer, but after that, Ethernet MAC adress was lost, something to check!