WestingHouse L2210NW Will not power.

[keeney123]

Re: WestingHouse L2210NW Will not power.

On the Westinghouse TVs I would also verify that the all the connector pins are actually soldered down to the board.

[momaka]

Re: WestingHouse L2210NW Will not power.

I need the u201 name please ....

Can you see any parts of the name on it? Any numbers or letters at all?
All I can tell you is that this IC is likely the PWM controller for the primary side. Probably something similar to UC3842.

Sorry I can't be of more help - I don't have this monitor or PSU.

[goldenmask]

Re: WestingHouse L2210NW Will not power.

I need the u201 name please ....

[goldenmask]

Re: WestingHouse L2210NW Will not power.

hi all .........
I need the u201 IC name on the darfon B092-xxx board . its broken on my monitor and the surface of the IC smashed pls help I cant find the schematic any where
thx .....

[testas86]

Re: WestingHouse L2210NW Will not power.

Here is a better pic of the burn on the logic board sorry for the delay

[HexInverter]

Re: WestingHouse L2210NW Will not power.

Hey dudes - I don't mean to hijack, but I actually have the same thing going on with the same board...and here I was thinking that no-one else was having issues with these (after searching high and low!)...

I'm a noob to LCD repair but know my way around basic electronics for the most part. I started a thread since a search for my inverter board and model number came up with nothing. (I am going to include it here right now so it gets indexed by searches in the future and people can find this!: Darfon B092-XXX ) What are the chances of two people having the same board going in the same forum at once? o.O

Anywhos, I did go ahead and check the stuff that Testas checked - the diode pair packages on the heatsinks...my readings show they're okay...transistors are okay, etc. I have heat marks around that under-board FET, so I checked that as per the instructions in this thread - everything checks out.

However, unlike Testas' problem, I did the flashlight test before trying to fix it and there IS a picture after the backlights drop out. So, I guess we must have a different problem.

I am going to swap out the last CapXon cap, read my transformers and report back, in the meantime. Here is my thread if you'd like to see the pictures I posted:

https://www.badcaps.net/forum/showth...568#post120568

[retiredcaps]

Re: WestingHouse L2210NW Will not power.

thats at b101

Pic is out of focus. Take your board to a window on a sunny day. Turn off flash and enable macro mode.

Again, you don't have to put the pic inline.

[testas86]

Re: WestingHouse L2210NW Will not power.

thats at b101

[testas86]

Re: WestingHouse L2210NW Will not power.

here is a pic of the burn

[retiredcaps]

Re: WestingHouse L2210NW Will not power.

this time i didnt get any power light and i did get a electrical burning smell. i took it apart and it smells like its coming from the other transformer. i did i reading on that one and i got nothing everything was out of range.

Post a picture of the logic board. And don't put it inline. Just leave as attachment.

[testas86]

Re: WestingHouse L2210NW Will not power.

ok so i found out what burnt up...

on the logic board that holds the vga and dvi inputs and also has the cable connector to the power button... there is a char mark on the logic board

[testas86]

Re: WestingHouse L2210NW Will not power.

ok so new development i just plugged it in to test it all again with out doing anything to it. i just wanted to make sure everything was not working like it was before. this time i didnt get any power light and i did get a electrical burning smell. i took it apart and it smells like its coming from the other transformer. i did i reading on that one and i got nothing everything was out of range.

[testas86]

Re: WestingHouse L2210NW Will not power.

the first reading i did while it was soldered on the board after that i removed it and retested them once i soldered it back in i tested it again and got .92 on 1 and 2 and .92 on 7 and 8

[retiredcaps]

Re: WestingHouse L2210NW Will not power.

There should only be new solder on the joints i used a desoldering iron to remove all solder from the transformer before removing it,

Did you desolder the transformer then to get the multimeter readings?

The only thing that I can think of right now is poor solder joints somewhere on the board or a bad CCFL.

[testas86]

Re: WestingHouse L2210NW Will not power.

There should only be new solder on the joints i used a desoldering iron to remove all solder from the transformer before removing it, and i got this monitor broken it was brought in to my work for recycling so i dont know about the pink hue. i will disassemble the monitor again and re solder all the joints and ill check the ccfl's to see if they are bad.

[retiredcaps]

Re: WestingHouse L2210NW Will not power.

At first it worked for more then 2 seconds, about 2-3 mins then i turned it off and moved it and tried it again and it started doing the two second off again. i took a flashlight and tried to see if i could see anything on the screen and its completely black no images at all.

Okay, one idea and one question.

It is possible that probing pin 7 and 8 has uncovered a poor solder joint. I suggest removing the old solder from pin 7 and 8 and putting in new fresh solder. A poor solder might explain the erratic readings on the multimeter? It is point #7 of

https://www.badcaps.net/forum/showthread.php?t=10419

That might also explain why it worked for 2 or 3 minutes until you moved it.

Question: Have you ever seen any pink hues in the last month of use? A pink hue is a sign of an aging CCFL drawing more and more power. The extra power draw will cause the inverter IC chip to shutdown the backlights.

[testas86]

Re: WestingHouse L2210NW Will not power.

ok so i have reassembled the monitor and turned it on. At first it worked for more then 2 seconds, about 2-3 mins then i turned it off and moved it and tried it again and it started doing the two second off again. i took a flashlight and tried to see if i could see anything on the screen and its completely black no images at all.

[retiredcaps]

Re: WestingHouse L2210NW Will not power.

At 2k ohms i got .880 on both

Okay, the transformer is okay. Yesterday the readings were pointing to an open winding on pin 7 and 8.

Let's move on. I suggest it is time to take a look at the CCFLs. This picture album shows what a bad CCFL looks like

http://s807.photobucket.com/albums/y...klight%20lamp/

Be very careful taking apart the CCFL assembly.

PS. You haven't answered yet re the flashlight test.

[testas86]

Re: WestingHouse L2210NW Will not power.

At 2k ohms i got .880 on both

also i test each set 5 times before i post results to filter out bad readings so i have no idea why its coming out good now...

[PlainBill]

Re: WestingHouse L2210NW Will not power.

at 20k with both probes together i get 0.00 ohms

pins 1 and 2 = .88

pins 7 and 8 = .88

That is a good match. Indulge me, try it with the meter on the 2K ohm scale. You should read about 880 ohms (.880 +- .025) on both windings

My concern is the fact that the readings keep changing. IF this is operator error, that is one thing; eventually your technique will improve. But if it's an intermittent problem with the transformer or other component, it will be difficult to locate the source of the problem.

PlainBill