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Equipment Repairs => LCD TV forum => Topic started by: samisat on May 02, 2015,07:52:54

Title: SAMSUNG LE37R88DB
Post by: samisat on May 02, 2015,07:52:54

Hi folks, I got this tv in which back light comes up for few second then goes off. replaced inverter board but no joy,18 v out put from power supply is OK, any idea?
Thanks sami

Title: Re: SAMSUNG LE37R88DB
Post by: Davy on May 03, 2015,10:43:35

What about the back lights?
If there's markings on the inverter Bon 'Back lights ON' , the marking may be on the power supply board that connects to the inverter, get a 3 volt battery and with the set switched on apply + to Bon terminal and the - on the battery to the chassis, this should turn the back light ON just to check and will by-pass any error shut downs,  providing the power supply is OK, I assume you have checked the relevant electrolytic capacitors.

Sometimes the high voltage ceramic capacitors coupling the tubes, creates this problem but you have ruled that out by changing the inverter board. I'd be thinking the back lights myself, that's why I suggested forcing them to come ON so you can check.

Dave

Title: Re: SAMSUNG LE37R88DB
Post by: samisat on May 06, 2015,08:48:51

THanks mate, I will do it later .
Thanks for ur help