telefunken te32883n17

[Zac]

Hi I have a telefunken te32883 TV that goes into standby by itself, with irregular times, then after several standbys the power supply completely shuts down.
Goes to standby on all sources.
power board vestel 17pw25-4 (23012668),
vestel 17mb62-2-6 (110112) motherboard.
I think it's a bios or firmware issue.
it is currently installed as software v.0.0.9a and application version v.0.2.9a
I look forward to info and eventually firmware. thanks bye

[nomoresonys]

Re: telefunken te32883n17

try heating the electrolytic capacitors with a hairdryer for a couple few minutes next time it shuts down, then see if it comes on for a bit, try it while it's still hot don't wait for it to cool down, maybe start with the ones closest to the connector there, what is it PL805, and move on to heat the rest of the electrolytics.

[Zac]

Re: telefunken te32883n17

hello thanks for the nomoresonys answer, I did some tests with the hairdryer and I was unsuccessful. then checked the electrolytic capacitors and replaced some that didn't convince me and checked the power supplies with an oscilloscope. +24v (25v) , 12v(12.7) have a small ripple. i 5v ( 5.17v), 3.3v ok.
with scart socket ok, but as soon as I put a source on hdm1 or hdm2 the tv goes into standby. the command is not given by 17mb62 (stby_on/off) it goes down after switching off. 5.17v present on the power board.
I do not understand the issue.

[nomoresonys]

Re: telefunken te32883n17

Does the tv only act up while trying to use hdmi sources?

[nomoresonys]

Re: telefunken te32883n17

I might not be understanding, are you saying that the standby voltage is not steady on the powerboard?

[Zac]

Re: telefunken te32883n17

for now the TV goes into stand-by as soon as I select hdmi with source, both hot and cold. Without source it won't turn off.

[Zac]

Re: telefunken te32883n17

the 5v are a little higher 5.17, but have no ripple

[nomoresonys]

Re: telefunken te32883n17

kind of seems like a memory issue.

[Zac]

Re: telefunken te32883n17

ok thanks for the info, what should i do? it seems to me that there are two memories

[nomoresonys]

Re: telefunken te32883n17

Hit them memory chips with a hairdryer for a couple few minutes then try it see if it works for a bit, if no joy, hit the hdmi chip with the hairdryer and see if it makes any difference, maybe also check any of the little mlc caps around them for shorts.

[Zac]

Re: telefunken te32883n17

found the problem, U1 lm1117 (17mb62-2-6) disconnected the 3.3v and turned off the 17pw25-4.
tested many times, always worked well, then crashed. thanks nomoresonys for the info and to all the staff. hello zac

[nomoresonys]

Re: telefunken te32883n17

Glad you solved it.