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SAMSUNG CHA4217L
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of SAMSUNG CHA4217L Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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Text excerpt from page 40 (click to view)
7 Troubleshooting

7-2-14 ABL Failure
Symptoms : – Full white luminance is too bright. (ABL minium is over 35 F/L) – Full white luminance is too dark. (ABL maximum is under 35 F/L) – The luminance of full white and No Video are almost same.

Display the full white pattern.

Check connections between CN202 and CN202_2.

No

Does full white luminance vary, adjusting ABL step with Softjig? Yes

Yes

Are full white and white square luminance almost same? No

Does the PWM duty of IC202’s Pin 21 vary adjusting ABL step? No Check and replace IC202 and around parts.

Yes

No

Is R121 right as CRT’s differential items? Yes

Replace R121 to higher or lower one that meets the spec.

Replace it.

Does the voltage of IC101’s 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 T501’s Pin 8 voltage vary between full white and No Video?
F/W: 1.5~3.0V No Video: 5.5~7.0V

No No

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.

Replace it.

No

Replace it.

7-16

CHA42*7L/5**7L

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