WestingHouse L2210NW Will not power.

[testas86]

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

[retiredcaps]

Re: WestingHouse L2210NW Will not power.

I'm decidedly old school, and find autoranging can lead to confusing readings. I'd set the DMM to the 20K ohm range and check the reading with the probes shorted together. After that, check from pin 1 to 2 and then from 7 to 8.

Both his dmm are manual range. One is the crap DT830B and the other is mastech 830l. The mastech 830l was used for the readings and done with the range set to 2k ohms.

Both dmms give a reading of 0.7 ohms when probes are shorted together.

It will be interesting to see the 20km test results.

[PlainBill]

Re: WestingHouse L2210NW Will not power.

BEFORE you order a replacement transformer, let's see if anyone else concurs that the transformer readings are suspicious. PlainBill?

If correct, those readings indicate a bad transformer. However, I'm concerned about the inconsistent readings. It could be an intermittent connection or poor technique.

I'm decidedly old school, and find autoranging can lead to confusing readings. I'd set the DMM to the 20K ohm range and check the reading with the probes shorted together. After that, check from pin 1 to 2 and then from 7 to 8.

PlainBill

[retiredcaps]

Re: WestingHouse L2210NW Will not power.

hmm ok well i guess ill replace the transformer and go from there

BEFORE you order a replacement transformer, let's see if anyone else concurs that the transformer readings are suspicious. PlainBill?

[testas86]

Re: WestingHouse L2210NW Will not power.

hmm ok well i guess ill replace the transformer and go from there

[retiredcaps]

Re: WestingHouse L2210NW Will not power.

now im not getting any reading on the transformer i did get .885 black 1 red 2 and on black 7 and red 8 out of range but now i just did it again to verify and its all saying out of range.

If you have any friends in the "industry", ask them to use a ring tester to test the transformer for you. It is a specialized tester and fairly expensive (> $100 I believe).

If 7 and 8 consistently show out of range on the 2k ohm scale, you have an open winding on the transformer.

[testas86]

Re: WestingHouse L2210NW Will not power.

now im not getting any reading on the transformer i did get .885 black 1 red 2 and on black 7 and red 8 out of range but now i just did it again to verify and its all saying out of range.

[retiredcaps]

Re: WestingHouse L2210NW Will not power.

Now that I see how you numbered the pins (there is no right or wrong way), my number #1 suspicion is that this transformer is bad.

Your measurements on the secondary pins (pin 1, 2, 7, and 8)

black probe on pin 1, red on pin 2 - .872 ohms
black probe on pin 7, red on pin 8 - justs around from 1.121 to 1.580 ohms

should be identical +/- 5%. PlainBill would say +/- 3%.

If you watch the youtube video link I posted earlier, that transformer was out be a factor of 10x (950 ohm versus 9500 ohms).

Now you can desolder the transformer and retest out of circuit to make sure that no surrounding component are affecting the measurements (just like the video).

If the numbers are still not identical, the next problem is where to find a replacement and are you willing to pay probably $25 for a replacement?

edit: You can email

http://lcdparts.net/T.aspx

to see if they have a replacement that is not listed on their website. If they do have a replacement ask them for specifications specifically what is the resistance between the secondary pins.

[testas86]

Re: WestingHouse L2210NW Will not power.

[sabre504]

Re: WestingHouse L2210NW Will not power.

Hi here is a pdf of the board layouts and so on
hope it helps

[retiredcaps]

Re: WestingHouse L2210NW Will not power.

no just that crack on the top is the only things i can see

Can you mark up the bottom side of the picture and tell me how you numbered the transformer pin tests?

[testas86]

Re: WestingHouse L2210NW Will not power.

no just that crack on the top is the only things i can see

[testas86]

Re: WestingHouse L2210NW Will not power.

hmmm ok so then that leaves caps or CCLFs

[retiredcaps]

Re: WestingHouse L2210NW Will not power.

Hmm, without a spec sheet or another transformer to compare to, I'm not sure if the 2 readings above are correct or not.

This video (about 8 minutes long)

http://www.youtube.com/watch?v=eNuGWBPRGKA

shows why I'm suspicious about the transformer readings.

Are there any markings on the transformer other than the top?

[testas86]

Re: WestingHouse L2210NW Will not power.

ok good to know thanks. and thanks for walking me through these trouble shooting steps. Does the FET look good?

[retiredcaps]

Re: WestingHouse L2210NW Will not power.

1) black on S1, red on D1 - 1 out of range
2) black on S1, red on G1 - 1 out of range
3) black on D1, red on G1 - 1 out of range
4) black on S2, red on D2 - 1 out of range
5) black on S2, red on G2 - 1 out of range
6) black on D2, red on G2 - 1 out of range

FET looks good.

[retiredcaps]

Re: WestingHouse L2210NW Will not power.

i tested it at 2k ohms and got a reading of .004
i also tested it with 200 setting and got .8

Since your mastech shows 0.7 ohms when the two probes together, it is a good fuse at 0.8 ohms.

[testas86]

Re: WestingHouse L2210NW Will not power.

1) black on S1, red on D1 - 1 out of range
2) black on S1, red on G1 - 1 out of range
3) black on D1, red on G1 - 1 out of range
4) black on S2, red on D2 - 1 out of range
5) black on S2, red on G2 - 1 out of range
6) black on D2, red on G2 - 1 out of range

[retiredcaps]

Re: WestingHouse L2210NW Will not power.

p2804nd5g

Okay, we are going to make sure this FET isn't shorted. Set your mastech to 200 ohms (two hundred).

Refer to the attached diagram.

1) black on S1, red on D1 - record/report ohms
2) black on S1, red on G1 - record/report ohms
3) black on D1, red on G1 - record/report ohms
4) black on S2, red on D2 - record/report ohms
5) black on S2, red on G2 - record/report ohms
6) black on D2, red on G2 - record/report ohms

[testas86]

Re: WestingHouse L2210NW Will not power.

nikos
p2804nd5g
un45j0a84