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jurb6006@gmail.com: Dec 06 10:06AM -0800 >"There is a full schematic for your clock gen at   http://wenku.baidu.com/view/1207127f31b765ce05081419.html "   Impressive, how the heck ddid you find that ?

JC <Chipbee40_SpamNo@yahoo.com>: Dec 06 01:25PM -0500 > http://wenku.baidu.com/view/1207127f31b765ce05081419.html > "   > Impressive, how the heck ddid you find that ?   pure luck........... :)

Ken <Ken@invalid.com>: Dec 07 09:51AM -0600 JC wrote:   > An image of the board is here :   > http://www.ebay.com/itm/HP-TouchSmart-300-Series-Motherboard-APP78-CF-510762-002-Test-Ok-/261300571054?pt=Motherboards&hash=item3cd6ba4bae   > JC   I have been to the Mountain!!!! Thanks to the info you led me to, and a little experimenting with another MB, I have come to the conclusion that the Clock Generator (SLG8LP625TTR) is bad. My real question was if the chip should be free running. In order to establish that, I found a MB with a ICS 9250AF-23 and found it had the same number of pins as the chip in question. It was not the same physical size, but I figured it was probably very similar since it used the same value xtal. I removed the processor chip on that MB and found that the clock generator was free running, so I assume the SLG chip should also be. There ARE a couple of outputs active on the SLG chip, but there are no CPU clk pulses on the SLG chip and they are not grounded.   I am not going to attempt to repair this MB, since I do not have the tools to replace the chip. It is nice however to arrive at a conclusion based upon information rather than theory. Thanks.

Amanda Riphnykhazova <licensedtoquill@gmail.com>: Dec 06 04:35PM -0800 Not in this case I fear, it is a CD cassette, not a tape cassette

RobertMacy <robert.a.macy@gmail.com>: Dec 07 08:39AM -0700 On Sat, 06 Dec 2014 17:35:01 -0700, Amanda Riphnykhazova   > Not in this case I fear, it is a CD cassette, not a tape cassette   not familiar with that. I once couldn't figure out how to remove a CD from a CD player. Some kind soul [without calling me stupid] said take a paper clip [stiff wire] and poke it through the tiny hole in the front and 'feel' around to push the grears directly and sure enough the cassette 'walked' is way out of the player ...be sure power is OFF.

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KenO <kenitholson@yahoo.com>: Dec 06 12:07PM -0800 mike,   "educational purposes only" have you taken a cellphone battery apart?   "I might start with 100 mA charge current voltage limited at about 3.7V depending on the exact chemistry involved." Agree it is best to start very conservatively.   Do you know of any websites that give reliable info concerning cellphone battery protection circuits?   Thanks   Ken

KenO <kenitholson@yahoo.com>: Dec 06 12:58PM -0800 Tim R,   Read "I came across an interesting thread on a flashlight battery explosion. http://www.candlepowerforums.com/vb/showthread.php?120888-ROAR-of-the-Pelican-(CR123-Explosion-during-use-firsthand-account)"   While it shows what can happen to Li cells this is different from my cellphone battery.   This was 2 primary CR123 lithium cells.   SilverFox said "The most likely cause is that one battery was drained more than the other one. As things warm up, the fuller charged cell tries to reverse charge the under charged cell and things heat up fast. Hydrogen gas is vented and when ignited, blows up. Once one cell is burning, it doesn't take much to ignite the other cell."   Believe the Nokia BL-5J Battery is 1 cell and different chemistry.   Googled "Nokia BL-5J" Battery explosion but did not find anything. This was quick search.   Totally agree you can not be too careful with Li Batteries!   Ken

jurb6006@gmail.com: Dec 06 09:58AM -0800 Been thinking. (ummm)   Looks like the ribbon cable is on the right side. (as you face the unit open) I think I am going to apply a piece of tape to the left side to help prevent rippage of the ribbon. It does look a bit heftier that one to the display of a laptop, but still. the lid as well as the base of this thing are heavy amd that is part of my concern. In fact they must have tried to use the unit because three people told me "Watch the lid on that fucking thing because it'll pinch the fuck out of your fingers".   Then I need something to support it upside down at the spine. At that point I guess I have to just start taking screws out. That should be safe enough. then I need a box because this place does not have a proper stock of electronic parts. In fact it is almost time to talk solderwick, and I don't care how much he swears by his suppliers (and he does), if they don't have Chemwick and LPS-2 then these things will have to be procured (EGAD !) from somewhere else.   However I will have to wait maybe until I am there a couple weeks to bark out orders and change their whole M.O. lol. But there are some things we simply need. I run into that all the time. I want to see what happens when the parts get ordered. I have seen people deal with the shittiest fucking parts places and swear by them. won't consider anyone else. What, is that your brother in laws company or something ?   I'll get my way. Just like when I took my ex-bosse's card and made a Digikey order and fixed four plasma TVs the next day. And he had no fucking clue where to get some simple ass MOSFETs. Nothing special about them at all.   Idiocy is annoying and that is why I try to keep jobs and not move aroud. they find out that I am right, but with each new place the process starts all over. Let's hope it goes well again, like it has the last few times.   Fucking people do not undersatand to even keep fuses in stock ? I MEAN IT. Damn one place I gave them the fuse rack for the wall.   Well I don't want to bitch about it, I just hope I don't run into problems. I heard from one guy there that the boss is stuck up on his suppliers kinda, let's see how bad it is.   Enough ranting, it is Saturday so I am going to find something constructive or destructive to do.   Thanks for your input. When I get the fucker cracked open I'll let you know what lurks inside. I bet it's a class D, it is just too small to not be. Sure it has forced air cooling, but that doesn't mean it isn't class D.   That squealing sounds like about 6 kHz, it is probably the difference between what the power supply is running at and the chopping rate of the output stage.   And really, what makes it junk ? I know it is too small and probably underbuilt but that is true of alot of things.   Anyway, enough for now.

jurb6006@gmail.com: Dec 06 09:20AM -0800 >"Is this a "digital" pot the wiper feeds an ADC ? "   No. See other post I am about to make.

jurb6006@gmail.com: Dec 06 09:22AM -0800 >"If one channel or speaker is dead, you will hear no effect."   Both channels work. Also, I am not the first intruder on the unit. The replacement pot is kinda rigged in there, bent so that the nob indexing would match. I thought that might be the problem but it is not.

jurb6006@gmail.com: Dec 06 09:31AM -0800 >"Page 4 of the PDF schematic that jurb posted does indeed show a ..."   Now I feel like a total asshole. (shutup Phil, you'll get a less cheap shot than this) One of those PDFs that do not automatically page down.   Well now that I have seen page four (lol) I see where to concentrate my search. It's obvious we got an OP AMP oscillator and a waveshaper. I see it is not DC controlled, and it uses a negative supply so the negative DC is pretty much expected.   When I varied the depth control I heard the sound change, that indicates the BBD and all that is working fine, it is just this little oscillator. Whaddya think, the cap ? I'll find out Monday.   Thanks folks. I'll let you know.

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