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7-2-14 ABL Failure
Symptoms : â Full white luminance is too bright. (ABL minium is over 35 F/L) â Full white luminance is too dark. (ABL maximum is under 35 F/L) â The luminance of full white and No Video are almost same.
Display the full white pattern.
Check connections between CN202 and CN202_2.
Does full white luminance vary, adjusting ABL step with Softjig? Yes
Are full white and white square luminance almost same? No
Does the PWM duty of IC202âs Pin 21 vary adjusting ABL step? No Check and replace IC202 and around parts.
Is R121 right as CRTâs differential items? Yes
Replace R121 to higher or lower one that meets the spec.
Does the voltage of IC101âs Pin 8 vary between full white and No Video?
F/W: 4.1~4.3V No Video: 5.3~6.0V
Yes Check and replace IC101.
No Yes Check and replace D518, IC101.
Does T501âs Pin 8 voltage vary between full white and No Video?
F/W: 1.5~3.0V No Video: 5.5~7.0V
Are 12 V line, R504, L504, Q501 and Q518 ok? Yes Are C509, D514, Q502 and Q506 ok? Yes Check and replace T501 and CRT.