iPhone 3G 8GB, won't boot. black vertical lines on screen for a second

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Hi there,

My iPhone 3G 8GB won't power up, and won't enter into dfu mode. It shows black vertical lines for a dry when i power it up by retentive hold + home several seconds. I have patterned the LCD - its fine. Re-flowed the system board, patterned cut connector. Still the same...

I'm pretty trusty that the problem in system board, but what defect in portion could be answerable for that?

Thank you.

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