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4 Service notes
NOTE
These components are affixed with glue. Be careful not to break or damage any foil under the component or at the pins of
the ICs when removing. Usually applying heat to the component for a short time while twisting with tweezers will break
the component loose.
Leadless chip component (surface mount)
Chip components must be replaced with identical chips due to critical foil track spacing. There are no holes in the board
to mount standard transistors or diodes. Some chips capacitor or resistor board solder pads may have holes through the
board,however the hole diameter limits standard resistor replacement to 1/8 watt. Standard capacitor may also be limited for
the same reason. It is recommended that identical components be used.
Chip resistor have a three digit numerical resistance code, 1st and 2nd significant digits and a multiplier. Example: 162 =
1600 or 1.6k
Ω
resistor, 0 = 0
Ω
(jumper).
Chip capacitors generally do not have the value indicated on the capacitor. The color of the component indicates the
general range of the capacitance.
Chip transistors are identified by a two letter code. The first letter indicates the type and the second letter, the grade
of transistor.
Chip diodes have a two letter identification code as per the code chart and are a dual diode pack with either common anode
or common cathode. Check the parts list for correct diode number.
Component removal
1. Use solder wick to remove solder from component end caps or terminal.
2. Without pulling up, carefully twist the component with tweezers to break the adhesive.
3. Do not reuse removed leadless or chip components since they are subject to stress fracture during removal.
Chip component installation
1. Put a small amount of solder on the board soldering pads.
2. Hold the chip component against the soldering pads with tweezers or with a miniature alligator clip and apply heat to the
pad area with a 30 watt iron until solder flows. Do not apply heat for more than 3 seconds.
How to replace flat ic (required tools)
1. Remove the solder from all of the pins of a Flat IC by using a desolder braid
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Содержание PT53X54J - 53" PROJECTION TV HD
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