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LG 42LC7D serial control problem
fogled@mizzou
Posts: 549
Hi all,
I was just wondering if anyone else has run into a serial control problem with an LG display recently. The one I have goes completely dead once I send it a power-off command, like the serial I/F ends up getting powered down too. I can't find any "fast on" setting on this one like Sony units that have a similar control issue. I also have another LG plasma display that uses the same command set, and works OK for power-up. I called and talked to LG, and I apparently have their engineers stumped for now.
Do any of you have any nifty ideas?
I was just wondering if anyone else has run into a serial control problem with an LG display recently. The one I have goes completely dead once I send it a power-off command, like the serial I/F ends up getting powered down too. I can't find any "fast on" setting on this one like Sony units that have a similar control issue. I also have another LG plasma display that uses the same command set, and works OK for power-up. I called and talked to LG, and I apparently have their engineers stumped for now.
Do any of you have any nifty ideas?
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LG_PWR_ON[] = {'k','a',$20,$31,$20,$31,$0D}
LG_PWR_OFF[] = {'k','a',$20,$31,$20,$30,$0D}
Yes, these are the same codes I'm using. But once I've issued the Power Off command, the serial interface goes completely dead, and won't respond again until I've powered the unit back on via the remote or the power button on the side.
According to an LG manual I have, there is a power saving feature that LG calls "Low Power." On is to save, off is normal. Check the OSD menus for the setting. The set that this manual belongs to has the low power option under the "Special" tab.
Also, the LG RS232 command list that I have says you can turn low power on and off and query with RS232. Best I can tell, these are the low power commands:
Low power off:
"'jq 01 00',13"
Low power on:
"'jq 01 01',13"
Low power status query:
"'jq 01 FF',13"
Unlike Sharp units, the power saving setting doesn't have anything to do with the RS232 port.
I've seen this discussed in another forum, and unfortunately haven't heard of a solution yet.
(Not counting "sell something besides LG")
- Chip
You're correct, no doubt. We've seen about a dozen of these over the last couple years and have never had this problem. Just wait, I suppose
Had to switch out those three and eat the cost of course. The replacements worked perfectly. LG had no answers!
Of course I should have posted something about this here instead of wasting time on phone calls to various LG engineers. Three instances is a bit much though. I have used Hitatchi, Sony and Samsung displays also, but never had problems, like this, with them.
I know this doesn't solve your problem, but a large part of successful integration is equipment selection and sometimes you have to make blanket decisions for the sake of your time and reputation.
FYI, I use Panasonic, Pioneer and Electrograph plasmas in my designs and have had excellent results from reliability and control perspectives.
This helps confirm my suspicion: it's a manufacturing defect. Some assembly line worker is probably plugging the RS232 module into the wrong power bus. A replacement should fix this problem.
Also taken to heart are the issues others have had. We've come to the same conclusion: stay away from LG if we can.
Thanks!