42" Hewlett Packard Plasma TV powers up but doesn't give a picture

[jr_tech]

I suspect that you will be pleased when you discover all that the tester can do. If you have not seen it yet, here is a link to a YouTube video of a short demonstration:

https://m.youtube.com/watch?v=b3dPBnYixs4

Contrary to his opinion, I find the ZIF (zero insertion force) socket to be very useful... about a month ago I went through a bunch of random semiconductor devices that were just thrown into a coffee can over the years and sorted out npn, pnp, fets, scrs, thyristors, diodes... very useful device!

Here is a pdf by the original desiger... likely more than most need to know, but an interesting read nonetheless:

http://www.mikrocontroller.net/attac...er_eng104k.pdf

jr

[Captainclock]

Originally Posted by jr_tech

I suspect that you will be pleased when you discover all that the tester can do. If you have not seen it yet, here is a link to a YouTube video of a short demonstration:

https://m.youtube.com/watch?v=b3dPBnYixs4

Contrary to his opinion, I find the ZIF (zero insertion force) socket to be very useful... about a month ago I went through a bunch of random semiconductor devices that were just thrown into a coffee can over the years and sorted out npn, pnp, fets, scrs, thyristors, diodes... very useful device!

Here is a pdf by the original desiger... likely more than most need to know, but an interesting read nonetheless:

http://www.mikrocontroller.net/attac...er_eng104k.pdf

jr

OK so when measuring a capacitor's ESR rating what kind of measurement should I be getting if the capacitor is good, and what kind of reading should I get if the capacitor is bad? I'm wondering because I'm going to see If I can take another crack at that Westinghouse TV.

[jr_tech]

Depends on the size, voltage rating of the capacitor and quality of the capacitor, but lower esr is better. I printed out this scale as a guideline, and find it useful.

http://www.electro-tech-online.com/a...003-jpg.84737/

It is also useful to compare readings to those taken on a new good quality capacitor of the same size and voltage rating. On large capacitors, say under one tenth of an ohm or lower, you may need to zero out or just subtract the test lead resistance to get a better reading.

jr

[Captainclock]

Originally Posted by jr_tech

Depends on the size, voltage rating of the capacitor and quality of the capacitor, but lower esr is better. I printed out this scale as a guideline, and find it useful.

http://www.electro-tech-online.com/a...003-jpg.84737/

It is also useful to compare readings to those taken on a new good quality capacitor of the same size and voltage rating. On large capacitors, say under one tenth of an ohm or lower, you may need to zero out or just subtract the test lead resistance to get a better reading.

jr

OK, so which leads should I use on the ESR meter to test the Capacitors? It has 3 leads a red, yellow and a green lead, and I'm assuming that I just need to use 2 of the 3 leads for the ESR test.

[Captainclock]

Well I think I might of found one of the faulty capacitors in the westinghouse TV that was causing it not to power on, it was a 150MFD 450V electrolytic capacitor that measured at about 135 MFD and ESR measured at a whopping 8.5 ohms. So I think that might of been why the TV wasn't powering on considering it was the main filter cap for the power supply, at least I think that's what it is.

EDIT: I retested the capacitors again, and there were a few capacitors that did actually test off from where they should of been, so it seems I will have to replace some capacitors on the power supply board for the westinghouse tv.
C46, C45, C59, C49, C11, C69, and C17 are the ones that measured unacceptable.