Phillips 42PFL5432D/37 Chirping and No Picture

[tw1ztid]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

ZD904 .02 and .02

ZD902 .05 and .05

Havin a bitchin time trying to get these things out.

Starting on removing the next two..

[retiredcaps]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

I'll start off by removing one leg of each diode and checking for false positives.

Remove them and test them out of circuit. Report your multimeter results for each one.

[tw1ztid]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

Thanks, never seen a fuse other than the glass looking ones.

All 4 read at .3, so they seem fine.

So far we're down to either

1) Diodes are bad and need replaced, casualties from when the Caps went bad?

2) Another (larger?) part of the power board is causing a false positive.

I'm leaning towards number one, like Mr. Bills situation, but I know to expect the unexpected.. I'll start off by removing one leg of each diode and checking for false positives. If they are, what do you recommend for being my first plan of action?

[retiredcaps]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

I'll remove them shortly then, I cannot find any other fuses on the inverter boards than the one on the power board..

Fuses begin with the letter "F". For example, F100.

Your 4 fuses circled in red.

[tw1ztid]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

If you switched the leads around, then yes all those readings suggest the diodes are all bad. You will have to desolder and retest out of circuit.

It is possible that something else on the board is shorted and causing all these potentially false positives.

I'll remove them shortly then, I cannot find any other fuses on the inverter boards than the one on the power board..

[retiredcaps]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

Ok, first results..

ZD904 .02 and .02

ZD902 .05 and .05

D925 .07 and .07

D912 .000 and .000

I should desolder one side from each to retest now?

If you switched the leads around, then yes all those readings suggest the diodes are all bad. You will have to desolder and retest out of circuit.

It is possible that something else on the board is shorted and causing all these potentially false positives.

[tw1ztid]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

Ok, first results..

ZD904 .02 and .02

ZD902 .05 and .05

D925 .07 and .07

D912 .000 and .000

I should desolder one side from each to retest now? I've repeatedly been getting the same results. There are other D and ZD diodes that the results came back fine.

Edit: checking fuses right now, so far so good

[retiredcaps]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

Plug your red probe into the red circled spot. Black probe into COM. The black probe will always stay in COM.

1) For the diode test, set the meter to the diode test function (blue).

2) For the resistance test (fuse), set the meter to the 200 (two hundred) scale (yellow).

[tw1ztid]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

Got everything ready.

[tw1ztid]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

No worries. With power off and the TV unplugged, there is very little you can do to damage the TV, multimeter or yourself.

Both the resistance and diode checks are done with the power off and TV unplugged.

It is when the power is ON, that you have to be careful because one slip of the probe can cause a short.

edit: See posts #19 and 20

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

In the guide, I have sections on multimeter, fuses, and diodes.

Thanks, that is 100x better than the video imo because it covers many different things. Was mainly worried that i wouldn't get the correct readings or short something. Be back later.

[retiredcaps]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

Sorry for that in advance.. lol.

No worries. With power off and the TV unplugged, there is very little you can do to damage the TV, multimeter or yourself.

Both the resistance and diode checks are done with the power off and TV unplugged.

It is when the power is ON, that you have to be careful because one slip of the probe can cause a short.

edit: See posts #19 and 20

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

In the guide, I have sections on multimeter, fuses, and diodes.

[tw1ztid]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

Dont have it yet. Slow day at work and trying to be prepared. I know how much i question every little thing , and worry if i do it right I'm sure im overcomplicating it. Sorry for that in advance.. lol. Once i catch on to the basics it all gets very simple.

[retiredcaps]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

Continuity is fine to test the diodes though?

1) Nope. Use the diode check function to check diodes.

2) Post a picture of your multimeter.

[tw1ztid]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

I don't recommend checking fuses with the continuity feature. Multimeters vary with respect to what they consider "continuous". Some cheap multimeters beep "continuous" for any resistance measurement under 1800okohms. No fuse is good when the reading is that high.

A good fuse should measure less than 1.0 ohms.

Ok. Continuity is fine to test the diodes though? Be nice to not to have to remove diodes unless its the right ones if possible.

[retiredcaps]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

I don't recommend checking fuses with the continuity feature. Multimeters vary with respect to what they consider "continuous". Some cheap multimeters beep "continuous" for any resistance measurement under 1800 ohms. No fuse is good when the reading is that high.

A good fuse should measure less than 1.0 ohms.

[tw1ztid]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

If you mean multimeter, afrotechmods makes great videos.

http://www.youtube.com/watch?v=bF3OyQ3HwfU

That's perfect. Looks like i'll be checking continuity. Will be back to report in.

[retiredcaps]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

Any recommendations on a video teaching me how to use this thing correctly?

If you mean multimeter, afrotechmods makes great videos.

http://www.youtube.com/watch?v=bF3OyQ3HwfU

[tw1ztid]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

FR4007 is 1kV not 600V, but any fast 1000V or 800V silicon diode should be fine. Don't get a standard 1N4007; it's nowhere near fast enough.

Gotcha


Any recommendations on a video teaching me how to use this thing correctly?

Or will this do, with same basic idea for fuses..
http://m.youtube.com/#/watch?desktop...i_X7Ew3Y&gl=US

[tom66]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

FR4007 is 1kV not 600V, but any fast 1000V or 800V silicon diode should be fine. Don't get a standard 1N4007; it's nowhere near fast enough.

[tw1ztid]

Re: Phillips 42PFL5432D/37 Chirping and No Picture

So i should have a multimeter in a few hours to check the fuses and diodes.