Sharp LC-42D64U... no video inputs work, OTA works

**Davi.p** · 11-09-2017, 06:37 AM

Re: Sharp LC-42D64U... no video inputs work, OTA works

"shopjimmy is out" ? Do yuo mean it exists no more?
I think you have to check the service menu settings, the first to do is a service reset, maybe the inputs are no more mapped or a confusion in their setting. After this one can check if there's a separate input mixer chip, that is at fault. Have you checked VGA?

**CapLeaker** · 11-09-2017, 07:11 AM

Re: Sharp LC-42D64U... no video inputs work, OTA works

I'd turn the set on and check the temperature of that silicon image switching IC to see if it gets really hot. There could also be something wrong with the main IC. Since you aren't really geared for replacing any IC's, I'd be replacing that main board.

**budwich** · 11-09-2017, 08:19 AM

Re: Sharp LC-42D64U... no video inputs work, OTA works

thanks... by "shopjimmy is out", I meant "out of stock" at the moment.

further details from this morning's look.

There are 7 inputs listed on the input menu... TV, input1-input7. The input can cycle from tv (ota), then jumps past input 1,2,3 (they are not marked / selectable) and then can cycle onwards to input 4 (hdmi), input 5 (hdmi), input 6 (hdmi), and input 7 (vga). Then back to TV. But some of the strange stuff, is that, it allows the choice of the hdmi inputs even though there are no cables plugged in to those... I would have expected them to be non-selectable / greyed out, otherwise. NOTE: when the hdmi inputs are selected the screen goes blank (black) like no signal input (no snow) but doesn't display any warnings of "no signal / check cable" or otherwise. Same with input 7 VGA which has no cable. I would expect similar. Further, inputs 3-4 are on sub boards on the side of the tv while inputs 5,6,7 are on the main board. See attached pictures. Disconnecting the cable interconnection between the side and main does not change the status of those inputs disconnected.

I will attempt to get into the service menu and see if there are any assignment capabilities. I have only just started looking thru the service manual.

We are leaning towards a card replacement and have started search for "something" (version and release).... but thought perhaps there is something that can be done in the mean time.

Thanks again

Attached Files

**budwich** · 11-09-2017, 09:25 AM

Re: Sharp LC-42D64U... no video inputs work, OTA works

I don't see anywhere in the service manual with respects to the service mode, that there are settings for assignment of inputs. I haven't tried entering the service mode as I don't have the remote at this time.

I have plugged into the vga connector (assigning input 7 to label PC). The system response with an error warning indicating (the signal is not compatible with this input). I haven't tried any adjustments of resolution yet.

**budwich** · 11-09-2017, 09:47 AM

Re: Sharp LC-42D64U... no video inputs work, OTA works

One thing that I am remiss on is the history of the TV. My friend bought the tv privately from a seller who said that their son was using it as a gaming set and it lost all the video inputs except for the OTA connection. My friend was OK with that because that's what he was initially going to use it for anyways... but as time has gone by, he / I thought we should look and see what's up with it... especially since I am a "pro" at fixing sharp 70 inch tab failure sets... :-)

Anyways, that's the lack of history story. Now for something interesting. Based on your responses to my thread, I started slowly going thru the service manual to find out things like input assignment and such. Then, in the service manual, I find that there are things called "model number id plugs" which appear to be "bonded jumper pairs" that get inserted into two connectors, sc9201 and sc9202. For a 46 set, sc9202 is supposed have the jumpers set in position 3 on the "array", while sc9201 should have the jumper at position 1. If you look at the picture of the main board, I think both are at position 1. hmmmm????
Can any one tell me what these things actually do? Is it possible that the owner may have replaced the main board with another set and didn't have these set right?

I guess my question is: can I move them or are there more things around clearing / resetting things like firmware, etc before this can be done successfully?

Another learning experience... fun fun!

**Davi.p** · 11-09-2017, 11:22 AM

Re: Sharp LC-42D64U... no video inputs work, OTA works

"Can any one tell me what these things actually do? Is it possible that the owner may have replaced the main board with another set and didn't have these set right?"
It is highly likely
"I guess my question is: can I move them or are there more things around clearing / resetting things like firmware, etc before this can be done successfully?"
On all PC/TV boards i've seen settings are made via software or via jumpers, never both...
Bye.

**budwich** · 11-09-2017, 11:32 AM

Re: Sharp LC-42D64U... no video inputs work, OTA works

thanks... I screwed up... i got the numbering of the model "twisted" in my head when looking at the service manual layout.... so destination plug is correct. I moved the plug and it didn't make any difference. :-(

also looking at the vga port, the warning message comes on with just the cable plugged in (no computer on the other end), so it appears to be lost in what it thinks is connected to any of the ports 4-7 (hdmi / vga).

**budwich** · 11-09-2017, 12:05 PM

Re: Sharp LC-42D64U... no video inputs work, OTA works

the set readily goes into the service menu. I didn't change anything but just step thru the "upper level" entries looking for some form of input assignments or otherwise. Didn't find any. didn't try any resets at this point as I am not familiar with the service menu stuff but know you need to be very very careful and sure of what you are trying to do.

**Davi.p** · 11-09-2017, 02:46 PM

Re: Sharp LC-42D64U... no video inputs work, OTA works

Since there are jumper banks for inputs settings i think there's no configuration you can change in SM to enable them, anyway a reset never damage. Since input numbers/names appears not greyed in the osd and vga input shows a signal problem then them are probably active but the signal is interrupted somewhere, maybe there's a switcher IC at fault or without pwr supply, and last usually on service manuals there are troubleshooting pages dedicated to bad inputs, but i dont know the Sharp's case, never fixed one. I have noticed by the photo that the inputs/tuner board have a separate multicable from the psu, maybe a separate supply that needs to be examined starting by possible fuses. bye.

**budwich** · 11-09-2017, 05:09 PM

Re: Sharp LC-42D64U... no video inputs work, OTA works

thanks... yes the tuner has a seperate board and is with other analog inputs.... but those are ultimately routed to the main. since the tuner is showing picture, some portion of the main board is converting and outputting to the tcon. I need to study the block diagrams more closely to see if there is something obvious. The board doesn't show any physical / component damage.

The SM has sections for trouble shooting stuff. I haven't gotten thru this yet as this is a special occasion at home... so I have been busy with that. Hopefully tomorrow.

Davi.p, you mention a "reset" from the service menu but I haven't found one "page/item" that provides any of this. There are some "clear" but I am think those are more dramatic as is "clearing memory / wiping firmware"... they look like "A mode area clear", "B mode area clear"... and one in particular "koutei area all clear". They sound pretty drastic. At this point, I wouldn't want to brick the thing as it does play OTA OK.

**Davi.p** · 11-09-2017, 05:39 PM

Re: Sharp LC-42D64U... no video inputs work, OTA works

For the terminology for the reset you better wait someone familiar with Sharp because different houses uses different terms, like Sony {Shipping condition), Philips (Virgin mode) etc., or read carefully the manual. It is useful also to watch if there is a block schematic for the main board, to see who handles tuner output signal and other inputs signals.

**petehall347** · 11-09-2017, 05:48 PM

Re: Sharp LC-42D64U... no video inputs work, OTA works

it might be called something in the service menu that doesnt make sense to you . like a samsung i screwed up and managed to put right again . i lost the digital tv . it was in service manual under "ready" i clicked it back on and fixed it .

**budwich** · 11-09-2017, 08:56 PM

Re: Sharp LC-42D64U... no video inputs work, OTA works

one thing that got done, was finally able to load the firmware. "Nice" sharp instructions are wrong. You need a FAT16 usb not a FAT32. Once I was able to format it to that, the update went in OK. The bad news it didn't resolve the issue.

In terms of the service menu parameters, I figure there must be some assignment / update somewhere but as mentioned it is probably not an obvious.

I still need to look thru the SM at the block diagrams to see how the switching is controlled and hopefully spot something.

**CapLeaker** · 11-10-2017, 06:39 AM

Re: Sharp LC-42D64U... no video inputs work, OTA works

Originally posted by budwich

one thing that got done, was finally able to load the firmware. "Nice" sharp instructions are wrong. You need a FAT16 usb not a FAT32. Once I was able to format it to that, the update went in OK. The bad news it didn't resolve the issue.

In terms of the service menu parameters, I figure there must be some assignment / update somewhere but as mentioned it is probably not an obvious.

I still need to look thru the SM at the block diagrams to see how the switching is controlled and hopefully spot something.

Usually something like yours, I call a "lightning special". With those I don't waste my time and just get replacement boards. I know that SJ is out, so you are at the mercy of other online dealers like ebay or whatever... I already pointed out what chips to look at.

**budwich** · 11-10-2017, 09:07 AM

Re: Sharp LC-42D64U... no video inputs work, OTA works

yes I will look at the suggested chip. My time is "free"... money, I don't have. This "hobby" keeps me off the "street" and out of bars... :-) although it does cut into my court (tennis) time but at this part of the season, its good to be in a warm work shop... :-)

I tried out the svideo port which is port 2... it works. So OTA works, svideo on port 2 (only port with svid bonded to it), but the associated rca video of port 2 doesn't work.

Your "lightning strike" designation is probably appropriate but I don't see any signs of this although I know it doesn't take much to take out hdmi with power surges.

Further question would be: what's the difference between svideo and video? It doesn't appear to be a switching issue as the input selector appears to work well. I has something to do with the signal types / processing. Analog audio inputs appear to work in all port associations. More time scanning thru the SM.

Still further. Svideo from a bell sat receiver (4700) works fine, the conversion of the rca vid out thru a rca to svid plug adapter works marginally (maybe the cheap adapter) BUT from an old dvd player with its svideo out into the same svid input on tv, no picture (blank screen). This appears to be some sort of level issue. I wonder if the previous owner was "wandering" around in the service menu and screwed things up in there. :-( The overall picture on OTA is fine some maybe not... maybe its just the circuitry associated with some of the signal processing.

Might be time to dig out my old scope and figure out how to look at the video inputs to see what's happening. This is well past my experience level, maybe 40 years ago.... some brain cells still might be around. :-)

**budwich** · 11-10-2017, 10:27 AM

Re: Sharp LC-42D64U... no video inputs work, OTA works

ok... some more fun. Since I don't know much about video signals (technical specs / makeup), I was hoping someone could point out what might be the issue on this.

Attached are two pictures. The first is menu straight from svid out of sat box to svid in on tv. Display is good. Next picture is rca vid out thru plug adapter to svid cable then to svid in (same input). Display isn't so good as you can see there is "bits missing" which I think is some level issue.... maybe. The reason for asking / showing this is that out of two dvd players (one of which is old and has an svid out), I get NO video from either svid direct or "rca vid adapted". To me, that points to some sort of level issue or timing issue maybe but was hoping someone might provide a bit more direction on this / these signal "expectations" based on what those pictures are showing.

Attached Files

**Davi.p** · 11-10-2017, 01:15 PM

Re: Sharp LC-42D64U... no video inputs work, OTA works

I think you have problems on software basis or cpu, i have not gone in deep read of the s.manual, to reset to defaults you must go in service menu and put ON on the menu item 2 at page 2 "industry init" and unplug mains, but this seems to reset only few values, if doesn't work you can try option 2 at page 32 "Eep recover" then option 1 page 32 "eep save" , bye.

**budwich** · 11-10-2017, 02:36 PM

Re: Sharp LC-42D64U... no video inputs work, OTA works

thanks again. I see what you are saying. hopefully, it will help.
I am leaning more towards a possible "corruption" of some data also. I can't see that previous "fingers / persons" would have gone in and done something... but you never know with the internet, everyone can be "dangerous". The entire system seems to operate as designed in terms of input changing, menus, values, responses. There is no lag and "freezes" so it seems the main processor is "happy".

I will discuss with my friend, the risk and see what he wants to do. I do see from the list of parameters that there are some sm adjustment for signal levels on page 3 (input 1 and 2) along with the tuner (which works fine). I don't feel confortable playing there but maybe. I will write / photo values before doing anything. I still don't have the remote in my hands.

the "eep recover" looks like it might be a good thing... sound like it copies some information from somewhere to a working area... maybe.

**Davi.p** · 11-10-2017, 03:02 PM

Re: Sharp LC-42D64U... no video inputs work, OTA works

eep=eeprom, "eep recover"=seems a restoring of a backup of settings from a storage area to the active area.

Sharp LC-42D64U... no video inputs work, OTA works

Sharp LC-42D64U... no video inputs work, OTA works

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