Vestel TV issue.

[Asuga]

I have a TV here i'm having problems with, the parts it's using are a 17MB15E-5 AV board and a 17PW15-9 PSU, both of which are by Vestel.

I replaced the AV board while doing some dianostics which didn't fix anything, so i put the original back in and replaced the PSU with a reconditioned one, and now it turns on and works as normal but after about a minute the display corrupts and the only thing that works right is audio.
I've noticed that the psu seems to buzz a fair amount at first, and that the corruption happens a lot faster if you simply switch it off them back on again when it crashes out, as apposed to waiting a while, leading me to believe that it's a defective cap or something.

Any ideas? (added pics to help explain the issue).

Internals:






Problem:

This is right after turning the display on, working normally


This is about 40 seconds after the display has turned on, suddenly it "crashes" and shows this, sound works normally throughout however menus and other such stuff don't show anymore

[PowerAmpFreak]

Re: Vestel TV issue.

I would suspect a voltage regulator overheating. Check if you can find a bad voltage regulator, especially on main board which fall out of spec after the 40 seconds.

[selldoor]

Re: Vestel TV issue.

Hi - I see that you are in the UK - please can you update your profile to show that and your voltage. Another thing is some members do not like pictures posted in line - they should be added using manage attachments.

I dont know much about tvs but is that a g-luxon cap in pic 5. They are poor and could well contribute to the problem. Are there more G-luxons in the set,
what make and series are the others.

Also in that pic it looks like the cable to the tuner has been on fire? and is
the tuner scorched? lightning?

[budm]

Re: Vestel TV issue.

Man, very nasty looking wiring! They sell TV with that kind of messy wiring like that?
Where is the connection to the LCD panel?

[Asuga]

Re: Vestel TV issue.

I would suspect a voltage regulator overheating. Check if you can find a bad voltage regulator, especially on main board which fall out of spec after the 40 seconds.

Unfortunately i don't have any tools with me to test with at the moment, however there's one IC on the mainboard that seems to get overly hot, it's not a voltage regulator though and i'm under the assumption that its usually that hot.

Could the problem i'm having be attributed to the psu?

[PowerAmpFreak]

Re: Vestel TV issue.

Unfortunately i don't have any tools with me to test with at the moment, however there's one IC on the mainboard that seems to get overly hot, it's not a voltage regulator though and i'm under the assumption that its usually that hot.

Could the problem i'm having be attributed to the psu?

Yes, if one or more of the output voltages does not stay within spec, things like this can happen.