Magnavox 26MF301B Manuel de service télécharger pdf (Page 24)

8-3 FL11.3TR

See FLOW CHART No.8 <P-ON+7V is not output.>

AL+13V is not output.

FLOW CHART NO.11

Ye s

Is approximately +13V voltage supplied to the

cathode of D641 and D642?

Check C639, D641, D642 and their per

iphery circuit,

and service it if defec

tive.

Check if there is

any leak or short-circuit on

the loaded circuit, and ser

vice it if defective.

TUNER+5V is not output. (LCD+13V is outputted normally.)

FLOW CHART NO.10

Is approximately +6.7V voltage supplied to the

collector of Q640?

Is approximately +6V voltage supplied to the

base of Q640?

Ye s

Check D645 and their periphery circuit, and service

it if defective.

Replace Q640.

P-ON+3V is not output.

FLOW CHART NO.12

Is approximately +3V voltage supplied to the

cathode of D647?

Ye s

Check if there is

any leak or short-circuit on

the loaded circuit, and ser

vice it if defective.

Check C645, D647 and their periphery circuit, and

service it if defective.

P-ON+3.3V is not output.

FLOW CHART NO.13

Is approximately +5V voltage supp

lied to the

cathode of D633?

Is the "H" signal (approximately +4 V) inputted to the

base of Q637?

Ye s

Check C633, D633 and their periphery circuit, and

service it if defective.

Check Q638, Q639, D666, P-ON-H2 line a

nd their

periphery circuit, and ser

vice it if defective.

Replace Q637.

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Magnavox 26MF301B Manuel de service Page 24

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