［令和三年六月十六日（2021/06/16）］
PC110 No.13：杉 現状 確認 ［to (English) Current status］
この「No.13:杉」は、頂いた物の一つで、"液晶不良品"だったのを、「FSTN-LCD」に置き換えたマシンだ。（図１）
この「FSTN-LCD」の前面には、"残留気泡"が沢山！
それで、（現在不調の）「No.10:葛城」の（比較的綺麗に仕上がった）「FSTN-LCD」モジュールを（"心変わり"をして、）ここへ移し替え、更に、「輝度調整用DC-DCコンバータ」を置いた。
尤も、この「コンバータ」も、先の「No.10：葛城」で、入れてあったものだが、再度、これに合わせて"輝度調整"をした。
加えて、先日購入した「汎用バックライト専用LEDバー（中大型ディスプレイ用：約55cm長）」（INV付き4本1組、2組US＄22.02／￥２,５２７送料・手数料等込み）の中の1本を、約10cm長さに切って、現用品と置き換えてみた。（図２［クリック］）
結果は、あまり変わらず。
（多分、明るくはなったのだろうが、"コントラスト"が変わらなければ、ベースが浮き上がっただけということ、なんだろうな）
困ったことに、画面に"横黒線"が、上方と中央部に1本ずつ入り始めた。
押さえると消えるので、何処か配線が浮き始めた為なのだろうが、これは根治が難しそう。
（折角、入れ替えた処なのに！？！）
それに、此のマシン、偶に、電源が入っても、動作し始めない時がある。これも、気になる処だ。
これは、このまま様子を見て行こう。
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＋＋＋ バックライト用LEDバー ＋＋＋
今回買ってみたのは、12〜24inchディスプレイ用で、"長さ約55cm、4本で1セット、リード線付き。
付属の「DC-DCコンバータ」は、入力10V〜30V、出力DC7.5V〜9.6Vだそうな。（図４［クリック］）
「コンバータ」の長さは約70mmで丁度良いが、幅が約20mmで、「PC110」の「CCFT用インバータ」のそれよりも約2mm広いので、もし流用しようとしても、そのままでは入れられないが。
今回は、「LEDバー」を約10cm長に切って、＋/−電極（LED端子を利用）からリード線を引き出して、「FSTN-LCD」用バックライト光源にした。
電極は、裏面の小孔を目安にして、表面の"LED電極の片側"ずつから取り出した。
図４［クリック］の下部の「LEDアレイ」は、LEDが1個多い。実使用は、LED17個。
此の「LEDアレイ」は、何処を切り取っても、電極の取り出し方さえ間違えなければ、全部のLEDを光らせることが出来るようだ。
LEDは3個で、1セットになっていて、印加電圧は最大9.6Vだそうだから、1個当たり3.2Vまでということらしい。
最大許容電流の仕様は不明だが、1個当たり約20mA程度かな。
実用上は、10〜15mAではないかと思う。（図３は、約6mAの例）
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[2021/06/16]
PC110 No.13:Sugi/Ceder current status
This "No.13:Sugi/Ceder" was one of the items gifted from a person, and it had a "defective LCD". The machine that I replaced with "FSTN-LCD". (Fig.1)
There are many "residual bubbles" on the front of this "FSTN-LCD" !
So, the (relatively beautifully finished) "FSTN-LCD" module of (currently out of order) "No.10:Katsuragi" Was moved here, and a "DC-DC converter for brightness adjustment" was placed.
However, this "converter" was also included in the previous "No.10:Katsuragi", but again, "brightness adjustment" was performed accordingly.
In addition, the recently purchased " General-purpose backlight LED bar (for medium and large size display about 55cm long)" (1 set of 4 pcs with INVs, 2 sets US $22.02/ \2,527 including shipping and handling) I cut one of them to a length of about 10 cm and replaced it with curret LED bar. ( Fig.2 [click] )
The result was not much different.
(Maybe it's brighter, but if the "contrast" doesn't change, it's just that the base has risen.)
The trouble is that "horizontal black line" has begun to appear one above and one in the center oo the screen.
It disappears when I press it, so it may be because the wiring started to float somewhere, but this seems to be difficult to cure. (Although it was replaced !?!)
Besides, there are times when this machine, by chance, doesn't start working when it's turned on. This is also a place to be worried about.
Let's take a look at this as it is.
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++++ LED bar for backlight ++++
The one I bought this time is for 12 to 24 inches display, about 55 cm in length, 1 set with 4 pieces, with lead wire each.
The attached "DC-DC converter" has an input of 10V to 30V and an output of DC7.5V to 9.6V. (Fig.4 [click])
The length of the "converter" is about 70mm, which is just right to the "CCFT inverter case" of "PC110", but the width is about 20mm that is about 2mm wider than that.
So though I checked to divert it, I couldn't put it in as it is.
This time, cut the "LED bar" to a length of about 10 cm, pull out the lead wire from the +/- electrode (using the LED terminal), and It was used as a backlight source for "FSTN-LCD".
The electrodes were taken out from "one side of the LED electrode" on the front surface, using the small holes on the back surface as a guide.
Fig.4 [click] The "LED array" example at the bottom has excess 1 LED. Actual use is 17 LEDs.
This "LED array" seems to be able to light on all the LEDs, no matter where I cut it, as long as I don't make a mistake in taking out the electrodes.
There are 3 LEDs in one set, and the maximum applied voltage is 9.6V, so it seems that each LED can be up to 3.2V.
The specification of the maximum allowable current is unknown, but it seems to be about about 20mA per piece.
In practice, I think it is 10-15mA. ( Fig.3 is an example of about 6mA)