Sharp Aquos LC-32AD5E-BK Fault

[inchley313]

I was wondering if anyone could help me. I have acquired a 32" Sharp Aquos that has a fault and every time I look on the internet, I get more confused as to what the issue is.

When you turn the TV on, there is a click and the green light comes on but there is no picture or sound. I have tried doing the volume/channel button reset but nothing changes. I have used the "Search" facility on this forum but I cannot find anyone who has managed to solve this problem.

I have had the back off the TV and cannot find any obvious faults but I have limited electrical experience and wouldn't know where to begin testing things.

The fuse on the lower board seems in tact and have had various pieces to bits to check fitting of ribbons, hidden parts of pcb's etc but again cannot find anything obvious.

I have read on this site that the t-con board can cause this type of fault but haven't yet read anything to prove replacing it fixes the fault.

Please HELP!!!!!!!

[Ryu.Hayabusa]

Re: Sharp Aquos LC-32AD5E-BK Fault

Check around for any bulging capacitors. If you don't find any, it isn't an indication that one couldn't be bad, but it is a quick way to see if that might be the cause.

[budm]

Re: Sharp Aquos LC-32AD5E-BK Fault

First thing we needs are good clear pictures of how all the boards are connected together, then good closed up pictures of each boards, we do not have the boards in front of us to inspect, so good clear pictures are a must.

[inchley313]

Re: Sharp Aquos LC-32AD5E-BK Fault

thank you for your replies, I will get some pics and post them when I get some time over the weekend.

[inchley313]

Re: Sharp Aquos LC-32AD5E-BK Fault

I have finally found time to remove the back of the TV today to get some pics. I also found at my local amenity site, a Sharp Aquos LC-20AD5E-BK and with a smashed screen but you can still get a picture. I hoped the tcon would be the same but no joy. Didn't cost me anything and I enjoyed stipping it and putting back together all the same.

Anyway, I have had a good look around the 32" again and see nothing obvious through my amateur eyes but maybe you guys see something different.

Thanks again for having a look guys, now for the geek porn!!

[inchley313]

Re: Sharp Aquos LC-32AD5E-BK Fault

and some more to go with them.

[Rtech]

Re: Sharp Aquos LC-32AD5E-BK Fault

I have just purchased the exact same TV,same as these boards exactly,same fault,Relay operated,Green Power light and that is it.Extremely difficult to take voltage measurements as the connectors do not allow easy turning over of the Power board,and none of them have any voltages etc indicated for the pins.All the caps have been ESR tested and are fine.One other pointer,maybe,is that the small fan on top of the CI slot does not come on, and there is no voltage input to the 12v voltage regulator that drives it.Have taken the Inverter off with no difference to the power lamp.Need to eliminate either the PSU of the AV Board,even if its necessary to buy a replacement of the faulty one ??

[budm]

Re: Sharp Aquos LC-32AD5E-BK Fault

OK, I just downloaded all the pictures, here is the service manual:


I will have to look closely at all the pictures and the service manual before I can back to both of you.

[budm]

Re: Sharp Aquos LC-32AD5E-BK Fault

OK, since the power relay for the switched 12v/24v does click on, that means the function of that main board is working, we need to check and see if we do have 12v, 24v or not at connectors CP411, 406, 412.

[Rtech]

Re: Sharp Aquos LC-32AD5E-BK Fault

To date after some tests then.F404 is O/C, and replacement does not blow,but still same fault symptoms.The UNREGULATED 12v into the input side of the fuse,starts at 14v and steadily drops of to a steady 1.2v(fuse still O/C at this time).No 24v on CP406,again still steady 1.2v.If I disconnect CP411 from the main board then there is no unregulated 12v at all.

[Rtech]

Re: Sharp Aquos LC-32AD5E-BK Fault

Further from Post 10.If I need to do tests with the PSU out then I need to be able to switch it on !! with a Monitor usually a 1K resistor acros the 5v line would do that,BUT what do I have to do to turn this on ???

[budm]

Re: Sharp Aquos LC-32AD5E-BK Fault

If you look at the diagram of the 12v/24v power supply section, there is no PS_ON that typically turn on the IC. The power supply is powered up when the main board turns on the power relay which will supply the 120/230VAC to the power supply bridge rectifier.
On the output side of the power supply you will see Diode D449, 446, 447, 456 which are setup as OR gate to detect if ALL the output voltages are present, if any one of the output is not present, it will turn on Q415 Protection circuit., You will have to disconnect the load and see if ALL the outputs are present when relay is on, since the shutdown will happen very fast you may need fast meter or scope to see the outputs.

[Jlaps]

Re: Sharp Aquos LC-32AD5E-BK Fault

My name is James. My sharp aquos LC-32AD5E-BK power pack got damaged, that is the four leg ic. Please can any one help me with the number?

[budm]

Re: Sharp Aquos LC-32AD5E-BK Fault

My name is James. My sharp aquos LC-32AD5E-BK power pack got damaged, that is the four leg ic. Please can any one help me with the number?

How about some good clear pictures of the board and the part in question? We have no idea what the part is without seeing the pictures, we do not have the board in front of us to look at.

[Deivydas]

Re: Sharp Aquos LC-32AD5E-BK Fault

Maybe someone can still help me? I check the scheme that Budm posted and I'm getting the Green power led for some reason, I can't go back to stand-by, the moment I plug the tv to DC I it turns green. I checked the voltages with my multimeter, I'm getting the 24/22.4V, but where it says SW +12v I'm getting only 5.2V. I can't see anything burned or anything like that

[budm]

Re: Sharp Aquos LC-32AD5E-BK Fault

Let me see the pictures of your board.

[Deivydas]

Re: Sharp Aquos LC-32AD5E-BK Fault

Okay so I've been reading around about this and I've found that sometimes the fuse F404 goes bad, I'm not sure if this is a fuse of some sort but it says next to this I'd say resistor F404. I've checked it with my multimeter and it shows as if the fuse is blown. Is this a fuse?
Here are all three photos I made: NEXT POST edited.

[Deivydas]

Re: Sharp Aquos LC-32AD5E-BK Fault

Here are the photos attached

[Deivydas]

Re: Sharp Aquos LC-32AD5E-BK Fault

Just did a resistance test on the so called F404, 10Moms, What could this mean?

[dick_barton]

Re: Sharp Aquos LC-32AD5E-BK Fault

Can't really see the colours but it does look like yellow/brown/yellow/xxx which would be 404x so looks like the fuse. However changing it may well just blow it again if there's a fault on that section.

Edit
10Mohm = open circuited.

Ignore the above as it would be 414 if following the resistor colour chart not 404 as I said.