Re: SHARP LCD TV LC-3244E-BK: No Backlight

I used wire to short c7558 and the display is ok now. Found minor black strip horizontal line. I believe that one of ccfl bulb going to be faulty. So probablybad ccfl bulb cause shut down display or protect short circuit scp of bd9883

Re: SHARP LCD TV LC-3244E-BK: No Backlight

hi. i fixed no power up, but with standby5V problem that happened after shorting C7558 as described on 8.17.2016, 9.54pm. Q2115, 2SK4096LS was found faulty and replaced with 2SK3561. Now 60V, 13V from power board is ok, but old problem still happen. Display shut off after several seconds but have sound.

i do not want to try shorting C7558 again .

Any solution for Display shut off after several seconds but have sound.?? Only DMM on my hand and no other equipment for troubleshoot. Need advice

Re: SHARP LCD TV LC-3244E-BK: No Backlight

many works were done before i decided to add jumper at C7558 to force start TV

a) replace high voltage ballatic cap
b) measure resistance of HV inverter transformer and found no significant difference
c) replace C7215,C7216 and C7217 1000uF , 25V at power circuitry

thought to replace DC-AC inverter Controller BD9883FV, but thinking if can use BD9222 as subsitution. I got this device from junk inverter board from Toshiba LCD TV.
No data sheet from website to change pin assignment and Vcc...

Re: SHARP LCD TV LC-3244E-BK: No Backlight

Forgot to let you know the detail of board.

It is a IP board of part no RUNTK419WJQZ . I downloaded a similar schematic RUNK396WJQZ from website and use it as referance

Prior to adding jumper to C7558, i replaced the below two mosfet as i suspect this is rootcause of display shut off after few seconds but have sound

Q7502 2SK3599 replace with B31N20D ( TO220AB and use inusalator between heatsink and body)

Q7501 2SJ655 replace with IRFS31N20D ( D2pak , but modified by using bare...

Re: sharp lc32sb24u bulb / inverter problem

after shorting C7558, the display is on for less than 20 secs and then off again .No more sound.

measure resistance of primary and secondary high voltage installed and found no open circuit and significant resistance difference. what will be next step ?

Re: SHARP LCD TV LC-3244E-BK: No Backlight

jumper C7558 and see if display is ok. if still shut off, may be some components have over current