Sharp lc32sh20u rare problem

[fastvideo]

TV mode: no video,no sound.
Input 1 (composite): have video, no sound.
Input 2 (composite): no video, have sound.
Input 3 (component): have video, no sound.
Input 4 (hdmi): have both video and sound.


Is this a really rare problem?
Any help here?

[PlainBill]

Re: Sharp lc32sh20u rare problem

TV mode: no video,no sound.
Input 1 (composite): have video, no sound.
Input 2 (composite): no video, have sound.
Input 3 (component): have video, no sound.
Input 4 (hdmi): have both video and sound.


Is this a really rare problem?
Any help here?

Sounds like a problem with the IC that selects the input. Unless you can find a bad power voltage regulator on the board, it will probably require replacing the appropriate board. The service manual is available on elektrotanya.

PlainBill

[kc8adu]

Re: Sharp lc32sh20u rare problem

yep a source switching problem.likely got zapped through the inputs.

[fastvideo]

Re: Sharp lc32sh20u rare problem

Thank you for the advise, will look into it later.
I have the service manual.

Flash memory is on scaler board if the tv has a corrupted firmware.
Problem with the IC that selects the input is on AV board.
This is very tough call to me, 50/50 chances of these two board.

I have a feeling that may be the firmware was corrupted.
If anyone have copy of this firmware please let me know, thank you.

[Wizard]

Re: Sharp lc32sh20u rare problem

Sounds more like corrupt firmware.

If you get working input at all, that is not the chip. Especially if the chip got clobbered, IC tend to die totally and give nothing at all. And double especially on generic TVs, they tend to use all in one IC to keep cost down. Usually Mediatek. (Yuck).

Cheers, Wizard

[fastvideo]

Re: Sharp lc32sh20u rare problem

If anyone have copy of this firmware please let me know, thank you.

[mbates14]

Re: Sharp lc32sh20u rare problem

and thats the thing you wont find. becuase i never have. unless the manufacturer has firmware updates on thier website.

[fastvideo]

Re: Sharp lc32sh20u rare problem

I think I am go for the scaler board.
After looking at the service manual, look like IC801 AND PERIPHERAL CIRCUIT is problem.

[fastvideo]

Re: Sharp lc32sh20u rare problem

Got another scaler board installed, no luck.
Now I am looking for IC4201.

[fastvideo]

Re: Sharp lc32sh20u rare problem

Defective IC4201 confirmed.
Replace a new one, TV is working again.

[malicegreene]

Re: Sharp lc32sh20u rare problem

i had to register to this forum just to say i have this SAME problem ....

i'm going to take your advice and replace this "IC4201" piece ...

if this works .. thanks a million ...

[malicegreene]

Re: Sharp lc32sh20u rare problem

also ... where did u get the IC4201 piece ...?

and what kind of directions did u find to replace it ... ?

can i just pull off the back of the tv and match the pieces ... in order to see which on to replace ...

any help would be greatly appreciated ... thanx...

[fastvideo]

Re: Sharp lc32sh20u rare problem

also ... where did u get the IC4201 piece ...?

and what kind of directions did u find to replace it ... ?

can i just pull off the back of the tv and match the pieces ... in order to see which on to replace ...

any help would be greatly appreciated ... thanx...

IC4201 is a 36pin SMD type IC. I have to remove it with hot air and spent quite some time to put back the surrounding SMD components.

Warning:
This job is not recommend for newbies.
Replace the complete AV board is more safe and easy job.

[malicegreene]

Re: Sharp lc32sh20u rare problem

any recommendations where to get the board... ?

been trying google ...but nothing ....

[PlainBill]

Re: Sharp lc32sh20u rare problem

any recommendations where to get the board... ?

been trying google ...but nothing ....

Someone on eBay is selling a set of 6 boards.

PlainBill