at the moment i am using IPA or thinners to clean liquid from mainboards however i have been offered a bulk deal on spill damaged electronics goods.as its a lot of items i am going to invest in a ultrasonic bath to do a better job of cleaning them.my question is can i carry on using the IPA or thinners in the ultrasonic bath or does anyone use specialist cleaning products to clean the mainboards with.
thanks
woodford
Member
Last Activity: 01-19-2012, 09:23 AM
Joined: 06-01-2011
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hp g56 no backlight
i have seen a few g56 laptops with the problem of no backlight.they all have led screens so no inverter to diagnose and i cant seem to find any fuses on the mainboard, any idea's where to start diagnosing this fault, ive tried new cable and new screen so definately mainboard issue and ive seen enough of this problem to think it may be a common fault.
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Re: reballing temperatures
i'll post the info tomorrow as i cant remember the exact model number of the reflow machine.i do know it was over £20000 so its not a cheap model although ive used some of the sub £1000 models and to be honest there wasnt that much difference in capability, the only difference i noticed was the poor build quality on the cheaper unit. -
Re: reballing temperatures
thanks for the help, i'll try again tomorrow and let you know.Leave a comment:
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Re: reballing temperatures
not to sure about the make or type of flux but it was sold to us with the reflow machine from a well known uk supplier for reflowing purposes.we are using quite a lot of flux and making sure it gets under the chip.the thermocouple is right up against the side of the chip and yes there is flux around the end of the thermocouple.Leave a comment:
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Re: reballing temperatures
yes, been fixing laptops for a while including reflowing however the company i work for want to move away from reflowing and concentrate on chip replacement and reballing.ive no problem with the actual reballing process, we just seem to be having difficulty removing the chips without damaging the board.Leave a comment:
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Re: reballing temperatures
i am using a ersa reflow machine with a air sucker tool.i am also using liquid flux.Leave a comment:
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reballing temperatures
hi,
ive had 2 laptops this week that require reballing.on both occasions ive removed a couple of pads from the mainboard when removing the vga chip.
i'm removing the vga chip at around 230c, shall i go hotter than this or is it better to stick to 230c but leave it longer.
thanks. -
moisture in vga chips
can anyone recommend a method to get rid of moisture in new vga chips.i replaced a chip on a dell xps today and it popcorned when the temp got up to solder melt point.
i am aware that baking in a oven will do the job but i dont know how long or at what temp.also is there a oven i could purchase that is made specifically for this job or is it just a case of using the preheat on a reflow machine
thanks. -
samsung r20 power fault
i have a samsung r20 that has no signs of life.i stripped it down and there is power getting to a few parts of the board and nothing showing shorted.i tested the standby voltage at the power switch and there is no voltage on all 4 pins.is the maxim chip responsible for supplying standby voltage to the power switch?ive reflowed the maxim but still the same. -
Re: Laptop Bios programmer recommendations needed.
ive just got one from ebay, will let you know in next few days if its any good.Leave a comment:
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Re: fujitsu amillo li1705 beep codes
solved, its the vga chip needed reflowing.Leave a comment:
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fujitsu amillo li1705 beep codes
does anyone know what 4 short then 2 long beeps means on the bios for this unit as its not listed on the bios central website.there is also no display. -
Re: toshiba satellite m60-104
its the power light on the laptop that flashes at a rate of around 8 times per second.i seem to remember some of the old toshiba units had a common fault with some electrolytic caps but i cant seem to find the article, any idea's anyone?Leave a comment:
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toshiba satellite m60-104
when i plug the charger in the power light flashes rapidly and nothing happens when i press the power button,any idea's where to start? -
fujitsu amilo pi1505
i have a fujitsu pi1505 that a friend has given me.the unit powers to the bios screen then freezes for around 3 minutes after which it reports fixed disk failure.i have tried 2 new hdd's, both of which report the same error.do you think it could be a sata controller problem? -
laptop chipsets
can anyone help regarding this problem.ive been asked by my employer to come up with a list of laptops that use the following chipsets.
NVIDIA G92-720-A2
G86-730-a2
G86-770-a2
G86-750-a2
G86-631-a2
Mcp67mv-a2
Gf-7200-b-n-a3
ive googled the part numbers but all i can find is chips for sale or datasheets, i need a list of the laptops these are used in.
thanks in advance -
maxim chip question
when reading the code on a maxim chip which part do you go by to get a replacement, example - the maxim chip full code is 1909ETI547NSCW.is it just the 1909E bit that is important or do i have to match it up exactly.what do all the other numbers and letters mean, are they just things such as date etc....
thanks -
Re: dell inspiron 1545 charge board diode
if you dont have access to the schematic how do you know the rating of a diode.does it go by voltage,amps or other?
thanksLeave a comment:
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dell inspiron 1545 charge board diode
on the chargeboard on this model there is a diode behind the power connector, does anyone know of a replacement? how do you tell which diode can replace certain ones or are most diodes of the same size the same rating.
thanks.
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