HPT5054 Buffers...

[tw2005]

Re: HPT5054 Buffers...

Looks like they'd be ok, this a list of subs I got Here

H5N3011P

[mmartell]

Re: HPT5054 Buffers...

Ok thanks I will get ready to pull the power plug

[mmartell]

Re: HPT5054 Buffers...

Refitted and put back with the buffers, the top buffer having the top ic removed.

Same thing, black screen with audio. I never saw a trace of light or anything on the screen at any time.

[tocold4u2]

Re: HPT5054 Buffers...

can u unplug x and. go into service mode with everything hooked up?

[mmartell]

Re: HPT5054 Buffers...

Remove the power cable or data cable or both to x main ?

[mmartell]

Re: HPT5054 Buffers...

Oops I made a rookie mistake. I forgot to plug in the data cable to the Y Main last night. Was checking the voltages at the parts I installed when I noticed it. Plugged it in and fired it up and...

[mmartell]

Re: HPT5054 Buffers...

Picture has black border on all four sides and some banding artifacts on the top but I will chalk that up to the upper buffer ic not being installed yet.

[tw2005]

Re: HPT5054 Buffers...

Picture has black border on all four sides and some banding artifacts on the top but I will chalk that up to the upper buffer ic not being installed yet.

Looking promising. someone did something similar recently and left an air gap between the conductors.

So just the one bad buffer and I guess hot air rework?

That's a fairly cheap fix for these.

[mmartell]

Re: HPT5054 Buffers...

Three fets and the scan ic. Hope to do the scan ic today.

The black border referred to in my previous post was due to the dvd player and the banding at the top due of course to the missing scan ic not drawing the odd (or even) lines it should be responsible for.

[mmartell]

Re: HPT5054 Buffers...

Having a bugger of a time with this scan ic. Pulled two traces (three actually but one goes nowhere). Tried solder paste and hot air. Tried drag soldering. Ugh. Need to brush up on my skillz lol. Still salvageable though, will have another go later

[mmartell]

Re: HPT5054 Buffers...

These mosfets are compatible, though I can't speak to longevity as the set is still under repair.

[mmartell]

Re: HPT5054 Buffers...

Is the pad under the scan ic for thermal transfer or just ground ? I put some solder paste underneath but only heated from below with my iron and added some fresh solder into the holes.

My second attempt was still better though. I drag soldered and cleaned up a few bridges but when reinstalled the pic came up for about ten seconds then poof - lights out and scan ic blown again.

I got 4 of these ic's for $20 so I'm sure they're chinese junk but shouldn't they last longer than 10 seconds if installed correctly ?

[freakaftr8]

Re: HPT5054 Buffers...

If you have a bridged connection you will usually blow them immediately. Have done it as well in my early days. I usually flux the pads and fan outwards with a soldering iron. Works like a charm.

[mmartell]

Re: HPT5054 Buffers...

Ya seemed to run with pic for 10 seconds or so. I was wondering if I had thermal runaway by doing a less than stellar job with the grounding pad.

I also left two live pins floating and now I'm wondering if the potential on those pins is enough to induce an arc over. Was going to tidy them up after verifying the ic was mounted properly but I think that could have killed it as much as anything.

Two down, two to go lol.

[mmartell]

Re: HPT5054 Buffers...

Third time is a charm. Had a couple of black lines, removed and resoldered carfefully and all is good. I will attatch a pic only because I am proud of my work )

[mmartell]

Re: HPT5054 Buffers...

Had two destroyed traces. Wired directly to connector. Mercifully they were both on a corner.

Thanks to everyone who helped and inspired me with the confidence to get it done !

[tw2005]

Re: HPT5054 Buffers...

Had two destroyed traces. Wired directly to connector. Mercifully they were both on a corner.

Thanks to everyone who helped and inspired me with the confidence to get it done !

Nice, if I had the gear it's something I'd like to teach myself to do also .