ViewSonic VP720B Service Manual - Page 48
No Display, 4. Lose Color
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UPC - 766907169218
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6.3. NO DISPLAY Power key N work ok Y Check N H V sync Y Check R.G.B N DATA Y Check N X101 Y Check I108 HS,VS N HWRESET Y Check N BACKLITE Check Keypad Check I108 Check I/O cable Check C159,C160 Check SCL,SDA Check Q102 N Check N 5V MCU N Check N P102 N Check N I101 N Check N I101,I102,I105 N Check N SCL,SDA I106 N Check N P105 WIRE Check I106 Check I/O cable Check P102 Check VCC2.5V, 3.3V,1.8V Check I103 Check PANEL 6.4. LOSE COLOR Some bits lost Y Check I108 N Pin I108 or R-pack soldering I103 poor N I106 poor soldering soldering P105 poor soldering Lose color R or G or B Y Check P102 N Pin 8,10,12 Check Sign Cable Y Check L108,109,110 N Check C104,105,107 R106,107,108 C108,109,110 Y I108 fail or poor soldering ViewSonic Corporation Confidential - Do Not Copy 45 VP720-1_VP720b-1
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