Sylvania LC155SL8 Dead


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Sylvania LC155SL8 Dead

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toolmaster
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Apr 22, 2010, 5:08 PM

Post #1 of 6 (3333 views)
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Sylvania LC155SL8 Dead	Can't Post

Howdy - I'm new to the forum. I appreciate any help you all may be able to give me.

I was asked by my father in law to take a look at this tv and see what I could do. I don't know what happened to it - but when I got it, it was blowing the 4a fuses. I usually assume that a part with a heat sink is likely to fail first...so I tested a little fet transistor (to the best of my limited ability) and it appeared to be shorted. All 3 legs tested against the heat sink were wide open. I replaced that (thanks digi-key) and now it doesn't blow fuses. But it doesn't do anything else either.

Any ideas?

(This post was edited by toolmaster on Apr 22, 2010, 6:56 PM)

tscheucher
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Apr 24, 2010, 9:52 PM

Post #2 of 6 (3311 views)
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Re: [toolmaster] Sylvania LC155SL8 Dead [In reply to]	Can't Post

Hello toolmaster!
Small guide to start:
http://home.twin.at/sendertechnik/help.jpg
best regards

toolmaster
New User

Apr 25, 2010, 2:07 AM

Post #3 of 6 (3303 views)
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Re: [tscheucher] Sylvania LC155SL8 Dead [In reply to]	Can't Post

Howdy tscheucher - Thanks for the help!

I pulled both zener diodes off to test them. The one underneath the resistor reads 002 in both directions (not sure what it's measuring on the diode setting). The yellow/red diode next to the resistor reads 348 in one direction and 392 in the other. I'm using a cheap cen-tech digital multimeter for this test. I use an older sears analog meter for most other tests.

The safety resistor reads open.

The caps read fine as per this ohmmeter test -
post #5

http://forum.allaboutcircuits.com/showthread.php?t=5326

Raised white component reads open.

Rectifier diodes read in only one direction with the diode tester setting of the multimeter.

I pulled the mosfet driver

I cannot find a datasheet to see where the drain, collector and emmiter are for this test

http://www.stickycarpet.com/pinx/test.html

jts1957
Veteran

Apr 25, 2010, 7:03 AM

Post #4 of 6 (3299 views)
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Re: [toolmaster] Sylvania LC155SL8 Dead [In reply to]	Can't Post

Datasheets:

K3563 FET
http://www.datasheet4u.com/download.php?id=606329 (click "locate datasheet" then "open" or "save.")

and

C2120Y Transistor
http://pdf1.alldatasheet.com/...3/CDIL/CSC2120Y.html

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(This post was edited by jts1957 on Apr 25, 2010, 7:04 AM)

toolmaster
New User

Apr 25, 2010, 2:29 PM

Post #5 of 6 (3291 views)
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Re: [jts1957] Sylvania LC155SL8 Dead [In reply to]	Can't Post

Thanks jts1957 - now you got me on both forums.

K3563 is the one I already replaced - but thanks for that link to the CSC2120Y. I'll give it a test today and see what comes of it.

Should those little zener diodes read in just one direction like the other larger diodes?

jts1957
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Apr 25, 2010, 5:40 PM

Post #6 of 6 (3284 views)
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Re: [toolmaster] Sylvania LC155SL8 Dead [In reply to]	Can't Post

When you mention "drain" & transistor & can't find datasheet it sets off bells & whistles. Gave both to be safe.
A diode junction is a diode junction is a diode junction (with rare exceptions). All test alike. Smile

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