WestingHouse 19" 19w4 LCD monitor- DAC-12M030

[Soisauss]

Re: WestingHouse 19" 19w4 LCD monitor- DAC-12M030

OK, that means the problem is in the inverter circuit that we isolate by lifitng the fuse. More likely to have the shorted out MOSFET which is very common problem as the other had suggested.
So you need to take good resistance reading again using the pin out of the MOSFET spec and my drawing as the guide.

Okay, what setting should I be using on my multimeter then? Should I continue to use the X1k Ohms setting?

[budm]

Re: WestingHouse 19" 19w4 LCD monitor- DAC-12M030

Here are the resistance test points
Meter probe on 1 (color does not matter), then check the reading between
1 and 2 = ???
1 and 3 =???
1 and 4 = ???
1 and 5 = ???

Meter probe on 6 (color does not matter), then check the reading between
6 and 2 = ???
6 and 3 = ???
6 and 4 = ???
6 and 5 = ???
Make sure to tell us if it shows as Ohm, K Ohm, M Ohm.

[Soisauss]

Re: WestingHouse 19" 19w4 LCD monitor- DAC-12M030

Here are the resistance test points
Meter probe on 1 (color does not matter), then check the reading between
1 and 2 = ???
1 and 3 =???
1 and 4 = ???
1 and 5 = ???

Meter probe on 6 (color does not matter), then check the reading between
6 and 2 = ???
6 and 3 = ???
6 and 4 = ???
6 and 5 = ???
Make sure to tell us if it shows as Ohm, K Ohm, M Ohm.

Okay, so the number 2-5, you want me to test each pin on said numbers right? For example, 1 and 2, Black will be on 1 and then I'll test each pin on 2 (which is 4) with red, correct?

^ That above is assuming you want me to follow the picture you've attached.

Also, my meter only reads in OHM... :/

[budm]

Re: WestingHouse 19" 19w4 LCD monitor- DAC-12M030

Black probe on 1 and red probe on for example the one I mark as #2 will be any one of those 4 pins since all those 4 pins in the circle are connected together. As you can see, the 4 pins on the right side of the MOSFETs are tied together.

[Soisauss]

Re: WestingHouse 19" 19w4 LCD monitor- DAC-12M030

Black probe on 1 and red probe on for example the one I mark as #2 will be any one of those 4 pins since all those 4 pins in the circle are connected together. As you can see, the 4 pins on the right side of the MOSFETs are tied together.

Okay, cool beans. I'll report back with the readings!

[Soisauss]

Re: WestingHouse 19" 19w4 LCD monitor- DAC-12M030

Okay, here are my readings. Using the same meter I've posted and using the green numbers on the meter.
The setting were set to x1K ohms

Meter probe on 1 (color does not matter), then check the reading between
1 and 2 = 15
1 and 3 =15
1 and 4 = 6
1 and 5 = 6

Meter probe on 6 (color does not matter), then check the reading between
6 and 2 = 2.5
6 and 3 = 2.5
6 and 4 = .6
6 and 5 = .6

[budm]

Re: WestingHouse 19" 19w4 LCD monitor- DAC-12M030

They do look bad, but I forget to tell you to use x100 Ohms scale for checking, sorry about that. Can you test it again? Also try reversing the leads of the meter so you will report 4 set of readings.

[Soisauss]

Re: WestingHouse 19" 19w4 LCD monitor- DAC-12M030

They do look bad, but I forget to tell you to use x100 Ohms scale for checking, sorry about that. Can you test it again? Also try reversing the leads of the meter so you will report 4 set of readings.

Okay, the setting is set to x100 Ohms.

Meter probe on 1 (Black), then check the reading between
1 and 2 = 45
1 and 3 =48
1 and 4 = 26
1 and 5 = 26

Meter probe on 6 (Black), then check the reading between
6 and 2 = 2.8
6 and 3 = 2.8
6 and 4 = .6 *No Change
6 and 5 = .6 *No Change
----------------------------------------------------
Meter probe on 1 (Red), then check the reading between
1 and 2 = 2.9
1 and 3 =2.9
1 and 4 = 2.79
1 and 5 = 2.79

Meter probe on 6 (Red), then check the reading between
6 and 2 = 45
6 and 3 = 45
6 and 4 = .6 *No Change
6 and 5 = .6 *No Change

[budm]

Re: WestingHouse 19" 19w4 LCD monitor- DAC-12M030

Not sure how you read the scale to be the same as 1K range to get 0.6 on x100 scale, the 0.6 = 60 Ohms, 2.8 = 28 Ohms.
At this points I would suggest to replace ALL 4 MOSFETs.

[Soisauss]

Re: WestingHouse 19" 19w4 LCD monitor- DAC-12M030

Not sure how you read the scale to be the same as 1K range to get 0.6 on x100 scale, the 0.6 = 60 Ohms, 2.8 = 28 Ohms.
At this points I would suggest to replace ALL 4 MOSFETs.

Good question....

Now the question is where can I get these mosfets without ordering from overseas in China (been reading some ebay reviews....and the result has my head scratching).

[jetadm123]

Re: WestingHouse 19" 19w4 LCD monitor- DAC-12M030

There are several American sellers on eBay selling the AOP605.

[Soisauss]

Re: WestingHouse 19" 19w4 LCD monitor- DAC-12M030

There are several American sellers on eBay selling the AOP605.

If you can link it, that's be awesome!


Btw, thanks a ton for your help and patient Budm!! You are a trooper!!!

[budm]

Re: WestingHouse 19" 19w4 LCD monitor- DAC-12M030

Just type in AO605 in EBAY search and select US only on the left pane. I.E.
http://www.ebay.com/itm/5X-AOP605-P6...item2a15bf0e14

[jetadm123]

Re: WestingHouse 19" 19w4 LCD monitor- DAC-12M030

http://www.ebay.com/itm/LOT-OF-2-AOP...item4ac5f61c37

[Soisauss]

Re: WestingHouse 19" 19w4 LCD monitor- DAC-12M030

Just type in AO605 in EBAY search and select US only on the left pane. I.E.
http://www.ebay.com/itm/5X-AOP605-P6...item2a15bf0e14

Gotcha!! Thanks again!! Just ordered 4 and shall be here next week hopefully. Will report back.

http://www.ebay.com/itm/LOT-OF-2-AOP...item4ac5f61c37

Thanks a bunch!

[Soisauss]

Re: WestingHouse 19" 19w4 LCD monitor- DAC-12M030

And....IT LIVES!!!!!!!!!!!! To serve again!

Thank you all for your help and to budm for guiding me step-by-step!

This forum is worthy of its recognition!

[budm]

Re: WestingHouse 19" 19w4 LCD monitor- DAC-12M030

Great, and thanks for the feedback.