Hi all,
I've got a Loewe Planus 4672-Z (Q2400) that's been going fine for years, but now over the last few months it's been progressively getting worse when attempting to switch it on. I was hoping someone here may have seen this problem before and might be able to give some pointers about what to try next.
Sometimes switching on (via the remote) starts the TV, but then it 'gives up' and switches back to standby. The green LED on the front of the TV will come on, but where the red LED usually goes off after a second, both LEDs stay on for a few seconds longer than usual and then the TV goes back to standby (the green LED goes out.)
When it starts exhibiting this behaviour lifting the back board slightly (the one with the firmware EEPROM on it and some signal processing chips) enough to make the main/lower board flex a little, will then allow you to switch the set on again via the remote. Every time the set switches on after this the language is in German (so it appears to have lost its settings) however sometimes the channel presets remain intact, while other times the channels are lost (so no channels are tuned in.) Switching the set off and on again via the remote is usually enough to regain the channel presets, however the language still has to be set back to English manually.
When the set switches on you can normally hear the degaussing circuit activate at power up, however if the set is not going to switch on the degaussing circuit never activates (however the CRT must be powered up as you can hear the quiet crackling noise when the CRT loses power again.) Also sometimes lifting the rear circuit board while the TV is switched on (in the same way as was done to get the TV to switch on in the first place) will often cause it to switch off instantly.
It looks to me like the TV is 'booting up' when switched on, but one of the tests that the firmware runs is failing, and it's switching itself off again. I'm not aware of any diagnostics you can perform to see what is causing the firmware to shut down, so I'm hoping someone here may have seen a similar problem before and might have some advice.
Any help would be greatly appreciated!
Kind regards, Adam.