Author Topic: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR  (Read 3670 times)

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Offline EEVblog

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EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
« 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.

 

Offline BillyO

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Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
« Reply #1 on: April 05, 2018, 03:23:52 am »
Dave, your troubleshooting skills are top notch.  :-+  :-+

That was a joy to watch.
 

Offline W2NAP

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Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
« Reply #2 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
 

Offline PetaVolt

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Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
« Reply #3 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?
 

Offline EEVblog

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Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
« Reply #4 on: April 05, 2018, 07:06:35 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.
 
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Offline Brumby

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Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
« Reply #5 on: April 05, 2018, 08:14:46 am »
Dave, your troubleshooting skills are top notch.  :-+  :-+

I'm a bit harder to please.  I wanted him to sort out the backlight driver.
 

Offline BillyO

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Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
« Reply #6 on: April 05, 2018, 12:57:35 pm »
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.
 

Offline janoc

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Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
« Reply #7 on: April 05, 2018, 02:33:16 pm »
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 ...
 

Offline tocsa120ls

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Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
« Reply #8 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.
-------
Short circuit - long fire
 

Offline thm_w

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Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
« Reply #9 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:

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
 

Offline seb30

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Re: EEVblog #1071 - Dumpster Dive HP Envy Touch PC REPAIR
« Reply #10 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!
 


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