lcd19-229 stand by light on and off

[tonyuk]

Re: lcd19-229 stand by light on and off

Part # printed on device U7 please?

the 8 leg ? number looks like ai A1C2857F GR8 09319 not sure if A1 OF IF ITS Ai

[tom66]

Re: lcd19-229 stand by light on and off

OK please check voltages on: pin 2, pin 5, and pin 7
Pins are counted as such, starting from dot:

[tonyuk]

Re: lcd19-229 stand by light on and off

hi tom that parts is burnt would that be all that the problerm is ? if so do you have link for that as cant find a match

pin 2 = 12.83 pin 5 =000 pin 7= 5. my dot is where pin 1 is

[tom66]

Re: lcd19-229 stand by light on and off

It's actually AIC2857F. Is it physically burnt? Your results indicate it is not functioning, in the very least.

One on eBay, they're about £5 each
http://www.ebay.co.uk/itm/1PCS-Brand...item3cc84b952e
but plan on about 2 weeks to get it from China.

See diagram here:
http://www.analog.com.tw/p2_6_detail...idTableName=05

Pin 2: input voltage, this is OK (12V from PSU)
Pin 5: output feedback, should be 1.25V - not OK indicating the output voltage is not present
Pin 7: on/off command, it is >2V indicating the main board processor says "I want power" but converter does not function. (Like a light switch which is on but with a blown light bulb.)

[tonyuk]

Re: lcd19-229 stand by light on and off

It's actually AIC2857F. Is it physically burnt? Your results indicate it is not functioning, in the very least.

One on eBay, they're about £5 each
http://www.ebay.co.uk/itm/1PCS-Brand...item3cc84b952e
but plan on about 2 weeks to get it from China.

does look burnt when zoom in is that the only place i can get one lol

[tom66]

Re: lcd19-229 stand by light on and off

From the pictures, it looks OK to me.

[tom66]

Re: lcd19-229 stand by light on and off

Other places to buy
http://www.ebay.co.uk/itm/ic-sop-8-A...-/400538572096
http://www.aliexpress.com/item/AIC28...449252694.html

BTW, dot always marks pin 1.

[tonyuk]

Re: lcd19-229 stand by light on and off

Other places to buy
http://www.ebay.co.uk/itm/ic-sop-8-A...-/400538572096
http://www.aliexpress.com/item/AIC28...449252694.html

BTW, dot always marks pin 1.

ok thanks tom i will get there in the end but reading not my strong point
hence why i fit kitchens and build cars lol