IBM 6656HG2 Service Manual - Page 16
White Screen Osd Is Not Displayed
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UPC - 087944642084
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3. WHITE SCREEN (OSD IS NOT DISPLAYED) WHITE SCREEN (OSD IS NOT DISPLAYED) U821 POWER PINS 3.3V, 2.5V? YES X201 OSCILLATE AS 24M? YES Input 1024x768@60Hz Signal. U401 PIN12 IS 65MHz CLOCK? PIN2 IS 48KHz H-SYNC? PIN3 IS 60Hz V-SYNC? PIN1 IS 48KHz H-SYNC? IS PULSE APPEARED AT SIGNAL PINS? YES J703'S PIN1 3.3V? YES TROUBLE IN CABLE OR LCD MODULE NO CHECK U801, U821 1. CHECK PIN34, 35 NO SOLDERING CONDITION 2. CHECK X201 3. TROUBLE IN U201 NO CHECK U201 OR U401'S SOLDERING CONDITION AND CHECK CONNECTION LINE FROM U201 TO U401 NO CHECK U802, U881 - 16 -
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CHECK U802, U881
NO
- 16 -
1. CHECK PIN34, 35
SOLDERING CONDITION
2. CHECK X201
3.
TROUBLE IN U201
U821
POWER PINS
3.3V, 2.5V?
NO
CHECK U801, U821
X201
OSCILLATE AS 24M?
NO
CHECK U201 OR U401’S
SOLDERING CONDITION
AND CHECK CONNECTION
LINE FROM U201 TO U401
NO
TROUBLE IN CABLE
OR LCD MODULE
J703’S PIN1
3.3V?
YES
YES
YES
YES
3. WHITE SCREEN (OSD IS NOT DISPLAYED)
WHITE SCREEN
(OSD IS NOT DISPLAYED)
U401
PIN12 IS 65MHz CLOCK?
PIN2 IS 48KHz H-SYNC?
PIN3 IS 60Hz V-SYNC?
PIN1 IS 48KHz H-SYNC?
IS PULSE APPEARED
AT SIGNAL
PINS?
Input
1024x768@60Hz Signal.