Discussion in "Electronics" started by    amsams    Sep 10, 2014.
Wed Sep 10 2014, 07:24 AM
Hi Everyone,
Its been like more than 3 years I'ven't been logging into the forum. I'm really sorry not to signing in often. Anyways now I finally logged in to put a question on electronic musical instrument like the digital keyboard from Xin Yun and the model no. is XY-213 54 keys keyboard.
Well it was good when i played it for long. But when I used the battery with required supply of voltage with AA batteries, I got the LCD panel dimming out often. And with time the display on the panel completely went off that you can't notice anything on it other than its engraved inside ones and the glowing of backlight LED . So I've opened the screws inside and checked whether the connections were lose. But they are all intact. I even resoldered every pins under the PCB. But it didn't help. So I wonder the LCD panel is not properly pressed or something, opened the LCD board and cleaned out the carbon contacts. I found it has pins like RD, CS, WR, DATA, VSS, VDD, +, and 2 other pins for LED terminals. Well it didn't help even after pressing the LCD screen properly. Nothing was displaying on the screen. Hence I tried to find the datasheet of that LCD which is HT1622-v2. I thought v2 means version 2 but I could only get the datasheet for just HT1622 which mentioned the max supply voltage that can be provided to LCD is 5.25V. Therefore I measured the supply voltage to the LCD in the when I turned ON the keyboard found to be 6.29V. For seconds, I thought wow it must be the culprit that might have been preventing LCD not to display any visible data. So my question is... Is the LCD really dead due to the high voltage supplied in it? And is there any way to repair it without changing to new one. And how would i check that LCD is really dead or not? I've attached some pictures of it like when i press slightly the data get displayed. So guys recommend me how to find the fault in the PCB/components.
Wed Sep 10 2014, 07:27 AM
The pictures of the LCD....

Wed Sep 10 2014, 08:01 PM
As the data comes on if you press the glass you have
bad connections to the black connectors.
I have not had much luck with these, but you might do better .

Try removing the glass and repositioning the strips to make contact.
If that fails try gently cleaning the connections between rubber and glass
and rubber and pcb.

[ Edited Wed Sep 10 2014, 08:08 PM ]
Thu Sep 11 2014, 04:09 AM
Dear ExperimenterUK,
Thank you for the advice. Anyways I did clean the area you told. Well actually when I unscrewed the LCD PCB the screen and the rubber were intact with both the PCB and the screen that it doesn't fall off when you lift the PCB upside down. So I assumed nothing is wrong with those connections. Though I have disconnected the connection between rubber wire and the LCD PCB and cleaned it. But its not working. And please make sure that when you press quiet slightly at the edge of the screen, some data are displayed. If you press on the edge firmly, not even a single data is displayed. Looking forward for the further reply......

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