メインコンテンツにスキップ

2016年9月16日に発売。モデル番号は1660, 1778で GSM かCDMA があり。/ 32、128、 256 GB / 色はローズゴールド、ゴールド、シルバー、ブラック、ジェットブラック

2261回答 すべてを表示

Working backlight but no image

I have a phone for repair it came in as no image problem with no backlight.

After checking the phone, a capacitor for the backlight, C3903, was missing. Instead of replacing it, I bridged it together which was wrong choice because it burned the backlight filter FL3901 off the trace. So after replacing the capacitor C3903 I made a jumper and connected it to C3725, enabling the backlight to turn on. Now the problem is image. I don't know where to start looking for the problem. Any response will be appreciated.

回答がありました! 回答を表示 同じ問題があります

この質問は役に立ちましたか?

スコア 0
コメントを追加

1 件の回答

ベストアンサー

C3903 is a NOSTUFF component, meaning it's not placed on the logic board. It's in the schematic though and was probably used for development/testing purposes. So there is no need to replace it. The other thing is that you NEVER EVER bridge/short the contacts for a capacitor...that's not how capacitors work. So you basically forced the output of PP_LCM_BL_ANODE to ground and blew the filter FL3901. Are you certain the backlight works?

As for the LCD, this is the circuit you need to troubleshoot. Check for shorts on the outputs and then check for proper voltages.

Block Image

And check the filters...

Block Image

このアンサーは役に立ちましたか?

スコア 2
コメントを追加

回答を追加する

Sarbear さん、ありがとうございました!
統計データ:

過去 24時間: 0

過去 7 日: 0

過去 30 日: 4

今までの合計 1,499