Hi repairers I have a confusing one (for me).
A friend has asked me to repair his 2 year old tv, is this a led driver fault?...
Tv boots normally but no backlights other than a very brief flash. Tested with GJ2C tester all leds come on at 186v. During boot get 162v at connector, brief flash from backlight as voltage slowly rises to 236v, if the set is left on this drops to around 60v over the next 5 minutes.
All diodes test ok, all capacity and esr of caps is good, lcd panel is unmarked and menu etc can be viewed with a flashlight. Psu is a Vestel 17IPS20, set has done 12.5k hours.
I'm thinking that regardless of having 2.6v at each of the backlights 63 leds during boot the current is not enough.. and then the climbing voltage?? it's got me.
If anyone more knowledgeable has any ideas I would be most grateful.
Thanks
A friend has asked me to repair his 2 year old tv, is this a led driver fault?...
Tv boots normally but no backlights other than a very brief flash. Tested with GJ2C tester all leds come on at 186v. During boot get 162v at connector, brief flash from backlight as voltage slowly rises to 236v, if the set is left on this drops to around 60v over the next 5 minutes.
All diodes test ok, all capacity and esr of caps is good, lcd panel is unmarked and menu etc can be viewed with a flashlight. Psu is a Vestel 17IPS20, set has done 12.5k hours.
I'm thinking that regardless of having 2.6v at each of the backlights 63 leds during boot the current is not enough.. and then the climbing voltage?? it's got me.
If anyone more knowledgeable has any ideas I would be most grateful.
Thanks
Comment