Magnavox 42mf231d/37 vscan not adjustable

[freakaftr8]

Re: Magnavox 42mf231d/37 vscan not adjustable

Yes. Black sparkles associated with low vscan voltage. Not too bad thou. And well monitoring voltage on the vscan pin it fluctuates 2 to 3 v from -174 to -172 depending on brightness of image etc.

[freakaftr8]

Re: Magnavox 42mf231d/37 vscan not adjustable

Also some image retention from things being on the screen for over a minute. Also an association to low vscan. I'm sure.

[tom66]

Re: Magnavox 42mf231d/37 vscan not adjustable

Try adjusting the Yrr and Yfr controls (this is a Samsung plasma panel?)

[freakaftr8]

Re: Magnavox 42mf231d/37 vscan not adjustable

Yes it is. I can try but I still need to figure what up with the ps
P

[freakaftr8]

Re: Magnavox 42mf231d/37 vscan not adjustable

Hey if anyone else has this model tv and has it cracked open for some reason or another. Can you tell me what happens if you disconnect the vscan pin from the loom connected to the power supply side and test the wire coming from the ysus. Are you getting voltage on that pin? And furthermore do you still actually have a picture?

[freakaftr8]

Re: Magnavox 42mf231d/37 vscan not adjustable

I give up. I'm going
To run it like this and wait for it to completely grenade

[freakaftr8]

Re: Magnavox 42mf231d/37 vscan not adjustable

Ok this TV's bugging me. Vscan voltage is going to the primary side in the form of +205vdc. Nothing going out of the transformer. Initial tests show the transformer is good. This power supply is the lj44-00092e or known as the v4c. Had a blown ic561 shorted zd565. Replaced both. Already replaced opto and a few other components. No power out still. Any ideas?

[tw2005]

Re: Magnavox 42mf231d/37 vscan not adjustable

The only thing I'm wondering reading through all your fault finding is have you tested the trimmer pot for the VSCAN adjustment? I had a samsung and vscan was all over the place and virtually unadjustable to the correct level. trimmer had a big dead spot in it. Although I could adjust it but erractic.

just a thought?

[freakaftr8]

Re: Magnavox 42mf231d/37 vscan not adjustable

Very good assumption. Yes it has been tested. And along with the trimmer I also for good measure replaced the regulator ic for the trim pot as well.

[capkid]

Re: Magnavox 42mf231d/37 vscan not adjustable

In my case, I had low vscan voltage and no vset, and I found a crap load of components (caps, resistors, diodes, fuse) that were bad or suspect in circuit with IC561. I counted something like 8 to 10 components. I haven't replaced them yet to verify whether the power supply will actually function like normal.

[capkid]

Re: Magnavox 42mf231d/37 vscan not adjustable

No unfortunately. The fuse I replaced when I replaced ic561 and shorted zd565

Where did you buy the replacement zener diode? Do you have a link?

Thanks.

Edit: Another question: Do you know if 5H0365R or 5M0365R can substitute for the 5L0365R IC?