LT26MC1A with a 715T2907-2 psu

[hifiguy]

Any help would be appreciated on a BUsh LT26MC1A with a 715T2907-2 psu.

The set responds to remote or manual switch on IE The standby light switches from red to blue and that's it, no backlight no sound. I have to switch off at mains to get back to standby.

Upon inspection I found the 12v reg IC had failed. After extensive searching I obtained and fitted a new one which has got the 12v back up but the set behaves the same. I'm thinking eeprom corruption. Any thoughts?

Cheers
Geoff

[tom66]

Re: LT26MC1A with a 715T2907-2 psu

On my Lexsor TV, this was caused by a dud diode in one of the switching regulators on the main board. Test all diodes on the switching supply for a short or open circuit using a multimeter.

[hifiguy]

Re: LT26MC1A with a 715T2907-2 psu

I need to get this one back on the bench. I'm pretty sure I checked all diodes but it's worth another look.
Thanks Tom

[vinceroger69]

Hi i have just been given this set its dead no standby light it has 336 v dc on mains cap zero volts on any of the secondary rails where do i start fault finding i have linked the psu schematic thanks
Guys which pins do i need to join with 1k resistor too bench test the psu.

[vinceroger69]

R_J do you have any ideas thanks