How to GT-S5830 boot repair ok but only bule screen 100% Tested Here

GT-S5830 boot repair ok but only bule screen

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Check security...OK

Initialising: SAMSUNG GT-S5830 Config ver.:1.00

I/O Level set to : 2600 mV

Box S/N: 090060xxxxxxxxxxx ,FW Ver.: 01.52

Connecting to Target...

JTAG device: MSM7227T

CPU IDCODE : 0x503C10E1 Mfg.: 0x070, Part: 0x03c1, Ver.: 0x5

CPU Manufacturer: QUALCOMM , CPU Name: MSM7227T

Halting CPU...

Starting target communication...

Detecting nand memory parameters ...

NAND flash device ID:00EC:0050 'NAND 512MB 1.8V 16-bit (Samsung)' found

NAND geometry: Blocks:00000800, Page size:1024 bytes , Block size:256 pages

NAND Writing MIBIB...

NAND Write OK! Elapsed time: 15.645895s (101.241 KiB/s)

NAND Writing QCSBL...

NAND Write OK! Elapsed time: 5.159296s (102.340 KiB/s)

NAND Writing OEMSBL1...

NAND Write OK! Elapsed time: 7.709441s (102.731 KiB/s)

NAND Writing APPSBL...

NAND Write OK! Elapsed time: 20.106150s (105.042 KiB/s)

NAND Writing UPCH...

NAND Write OK! Elapsed time: 10.211584s (103.412 KiB/s)

All Done

but still bule screen any solvtion???????????????