Laptop inverter

[smason]

Has anyone ever attempted to repair a laptop inverter?

In my day job I look after IT for a 100 person company. We've seen probably 6 or 7 Dell Latitude inverter failures in the last 6 years.
The ones out of warranty we replace the inverter with a unit from Ebay, and have had great success.

Dell won't sell the part, and will replace the entire screen if under warranty.

Just had a D-810 inverter fail, so thought I might do something crazy, like try to fix it. These things are tiny, could be a major pain in the ass...

Will report back once I start troubleshooting.

[retiredcaps]

Re: Laptop inverter

Has anyone ever attempted to repair a laptop inverter?

The replacement inverters usually sell for $5 USD with free shipping from ebay from far east sellers.

The components are way too small for me and even think about soldering.

[smason]

Re: Laptop inverter

Yeah, I'm thinking that parts (FETs and transformers) might be made out of unobtanium.

[primoz1]

Re: Laptop inverter

I got similar problem with toshiba satellite P300D, got DIM screen and inverter is OK.

So I want somehow start that inverter Sumida 94V-0 independent from motherboard, but not got schematic and not really know which 2 pins must connect to power and start CCFL light.

any idea ?

thank you

[budm]

Re: Laptop inverter

The inverter will requires these signals:
B+ for running the inverter which is connected to the SMD fuse on the inverter board.
Ground which will be the negative leg of the filter cap after the fuse.
BL_ON: Backlights on signal from the main board, >1V = ON
Dim: Dimming control signal from the main board, this one can be variable DC or PWM signal.

[homore]

Re: Laptop inverter

are you basing these readings off of a voltmeter or software?

[budm]

Re: Laptop inverter

Those 4 signals/voltage are the basic requirement for the inverter to operate. You can use Ohm meter to trace out the B+ and the Ground. The BL_ON you will need DC meter to monitor the line that will toggle high (ON), LOW (OFF) for the BL_ON. Dim may have to use both DC meter or the scope to look at the signal to find out if it is PWM control or not.
It is applied to the monitor and TV as well.

[primoz1]

Re: Laptop inverter

Hi. Thanx for guides, here is link to pics of inverter.

http://s781.photobucket.com/user/bez...brary/inverter

[Davi.p]

Re: Laptop inverter

is your screen completely dim? therefore with no backlight? if you want a schematic try to take the datasheet of the IC, there's maybe an example as usual..

[primoz1]

Re: Laptop inverter

Hi. Is not complete dark, I got picture if look from side or use flashlight, but CCFL not start, I got spare LCD and inverter and LCD cable all parts tested and work OK.

I see one time tutorial how to make that bypass but bookmarks gone

[shortchange]

Re: Laptop inverter

Is the ic OZ965?
I believe you should see continuity at pin 16 and fuse F1

[primoz1]

Re: Laptop inverter

Hi I check that pin and got 18v there, but I got 0Z991

must find datasheet for that

[primoz1]

Re: Laptop inverter

This is only what I found in free web area.

can someone confirm if pins are equal like 0Z9910AGN ?

thank you

[shortchange]

Re: Laptop inverter

smason
Can you get more photos? What are IC's?
Continuity for fuse F1 and from F1 to U1 and U2 -at least one pin?

primoz1
Use your ohm meter as budm said "...use Ohm meter to trace out the B+".
Pin 14 to the fuse.
The IC is turned off and with a high impedance you will see 18v.
Pins 2 and 4 test continuity to only one pin of connector CN1

[Davi.p]

Re: Laptop inverter

Hi. Is not complete dark, I got picture if look from side or use flashlight, but CCFL not start, I got spare LCD and inverter and LCD cable all parts tested and work OK.

I see one time tutorial how to make that bypass but bookmarks gone

It's the third time i rewrite this post, it doesn't take it.. SGRUNT!
Bypass what? You mean exclude protection? Be more clear, wich test you've done? You connected togheter:
1. lcd 1 - inverter 1 - cable 1 = works?
2. lcd 1 - inverter 1 - cable 2 = works?
3. lcd 1 - inverter 2 - cable 1 = works?
4. lcd 2 - inverter 1 - cable 1 = works?
or other combinations?

[primoz1]

Re: Laptop inverter

Hi. sorry. I try to Light Up that CCFL because is DIM now. But crap stop work complete.

So reball time again

will repost back what happen.

[Davi.p]

Re: Laptop inverter

i've not understood your last post, a schematic that seems similar to your circuit is in the datasheet of OZ960

[primoz1]

Re: Laptop inverter

I only find-dig this and may be similar pinout like on my IC, but laptop wont start, now I make reball again and we will see what happen.

[primoz1]

Re: Laptop inverter

Ok is alive again http://tinypic.com/r/md1nxt/5

This is the thing, inverter start CCFL just for eye blink and go off. I got 3 replacemant screens and cables and inverters and on all is same. I think north bridge is out (bad) but if I success somehow start that CCFL will work like OK. till my new NB chip not arrive from china (end of januar 2014 app)

Because I ask is some option to make some bypass wiring on inverter to start CCFL, but Im not PRO and even SEMI PRO electronic, so that is little tricky and hard for me.

I hope you all understand what I mean.

Thank you.

[primoz1]

Re: Laptop inverter

It's the third time i rewrite this post, it doesn't take it.. SGRUNT!
Bypass what? You mean exclude protection? Be more clear, wich test you've done? You connected togheter:
1. lcd 1 - inverter 1 - cable 1 = works?
2. lcd 1 - inverter 1 - cable 2 = works?
3. lcd 1 - inverter 2 - cable 1 = works?
4. lcd 2 - inverter 1 - cable 1 = works?
or other combinations?

Sorry for late RE. Yes I want bypass that exclude protection somehow.

Thank you.