Magnavox 37MD359B Manuel de service télécharger pdf (Page 37)

9-3 A94F0TR

See FLOW CHART No.9 <P-ON+7V is not output.>

See FLOW CHAR

T No.9 <P-ON+7V is not ou

tput.>

AL+13V(M+13V) is not output.

FLOW CHART NO.12

Ye s

Is approximately +13V voltage supplied to the

cathode of D641 and D642?

Check C639, D

642 and their periphery circuit, and

service it if defective.

Check f

or short-circuiting or leak on the load circuit,

and service it if de

fective.

P-ON+5V is not output. (LCD+16V is outputted normally.)

FLOW CHART NO.10

Is approximately +6.8V voltage supplied to the

collector of Q643?

Is approximately +6V voltage supplied to the

base of Q641 and the b

ase of Q643?

Ye s

Check D645 and their periphery circuit, and service

it if defective.

Replace Q641 and Q643.

P-ON+5V(TUNER+5V) is not output. (LCD+16V is outputted normally.)

FLOW CHART NO.11

Is approximately +6.7V voltage supplied to the

collector of Q640?

Is approximately +6V voltage supplied to the

base of Q641 and the base of Q643(Q640)?

Ye s

Check D645 and their periphery circuit, and service

it if defective.

Replace Q641 and Q643(Q640).

D+5.5V is not output.

FLOW CHART NO.13

Is approximately +5V voltage supplied to the

cathode of D634?

Ye s

Check for short-circuiting or leak o

n the load circuit,

and service it if def

ective.

Check C634, D634 and their periphery circuit, and

service it if de

fective.

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Magnavox 37MD359B Manuel de service Page 37

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