Panasonic CT-27HL15UN 서비스 매뉴얼 - 페이지 3

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WARNING

The potential source of x ray radiation in the TV set is in the high voltage section and the picture tube.

NOTE

It is important to use an accurate, calibrated high voltage meter.

Set the brightness, picture, sharpness and color controls to minimum.

Measure the high voltage. With a 480i or 1080i signal the high voltage should be 29.5kV ± 0.3kV. If the upper limit is out of tolerance,

immediate service and correction is required to insure safe operation and to prevent the possibility of premature component failure.

Horizontal oscillator disable circuit test

This test must be performed as a final check before the receiver is returned to the customer. See horizontal oscillator disable circuit

procedure check in this manual.'

2 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

resistor, 0 = 0 (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

Use solder wick to remove solder from component end caps or terminal.

Without pulling up, carefully twist the component with tweezers to break the adhesive.

Do not reuse removed leadless or chip components since they are subject to stress fracture during removal.

Chip component installation

Put a small amount of solder on the board soldering pads.

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)

Remove the solder from all of the pins of a Flat IC by using a desolder braid

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7/7/2008