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Equipment Repairs => LCD TV forum => Topic started by: call me al on October 24, 2014,17:11:52

Title: sharp lc32d44e
Post by: call me al on October 24, 2014,17:11:52

Hi All have this head wrecker of a set Sharp ic32d44e wont turn on .Have worked on this model before so fitted short and kept source and vol down pressed as described in the sharp service manual and applied power However it still wont come on green light comes on for a few secs and then goes red .any ideas  how to fix this much appreciated

Title: Re: sharp lc32d44e
Post by: t1412 on October 24, 2014,17:25:09

hi did you reset the errors

regards
shaun

Title: Re: sharp lc32d44e
Post by: call me al on October 24, 2014,17:29:21

Hi shaun cant reset errors as set wont come on

Title: Re: sharp lc32d44e
Post by: t1412 on October 25, 2014,02:18:51

i know you have to short c7588 out, then service mode 

Title: Re: sharp lc32d44e
Post by: downunder on October 25, 2014,04:05:28

Hi Al,
You may have to try a few times before it goes to service mode. Do you get a brief flash of backlights when it attempts to start? This model was notorious for CCFL failure. Entering the service mode automatically disables the backlight protection. Shouldn't need C7588 shorted out. If you do get in, reset the lamp error count to zero, because this set will lock up after 5 CCFL errors.         Bruce

Title: Re: sharp lc32d44e
Post by: call me al on October 25, 2014,07:33:41

thanks bruce no dont get any flash of backlights is there any way to fource the power to stay on

Title: Re: sharp lc32d44e
Post by: downunder on October 25, 2014,15:48:47

Hi Al,

Try holding the buttons for 20 seconds  and see if the letter K appears. As far as I know, this only works if the TV has faulty CCFLs, which may not be your case. I believe others have used PR- and VOL- to achieve some result, but I've never tried this myself.

In case of failure, I'd check to see if STBY-5V remains steady, and if PS-ON is present when the TV reverts to standby. If not, I'd tend to think Main is faulty, and I'd try tying PS-ON to STBY-5V via a 100 ohm resistor to see if the psu volts come up.

Also, if there's a AC-DET pin on the PSU-to-Main connector, this should come up to around 4V. This is detected by the Main micro and if it is missing, the TV wont turn on. It is generated from the mains volts on the PSU.

See how you go with that.     Bruce

Title: Re: sharp lc32d44e
Post by: t1412 on October 25, 2014,17:30:44

yes bruce you are right, but it'll only stay on for a couple minutes, then you have place short across the c7588 capacitor to keep on so you reset the lamp error's then remove the short

regards
shaun   

Title: Re: sharp lc32d44e
Post by: downunder on October 26, 2014,01:58:23

Hi Shaun,

Thanks for the enlightenment.           Bruce