Magnavox 40MF430B - Service Manual download pdf (Page 31)

8-3 FL10.5TR

FLOW CHART NO.10

P-ON+5V is not output.

FLOW CHART NO.11

Is approximately +8V voltage supplied to the

collector of Q652?

Check C659, D662 and their periphery circuit, and

service it if defective.

Ye s

Replace Q652.

P-ON+3.3V is not output.

FLOW CHART NO.12

Is approximately

+5V voltage supplied to the

collector of Q653?

Is approximately

+4V voltage supplied to the

base of Q653?

Ye s

Check D666 and their periphery circuit, and service

it if defective.

Check C663, D665 and their periphery circuit, and

service it if defective.

Is approximately +6V voltage supplied to the

base of Q652?

Ye s

Check D664 and their periphery circuit, and service

it if defective.

Replace Q653.

Check if there is any leak or s

hort-circuit on the loaded

circuit, and service it if defective.

LCD+12V is not output.

Is approximately +12V voltage supplied to the

cathode of D672?

Ye s

Check C657, D672, D673 and their periphery

circuit, and service it if defective.

FLOW CHART NO.13

Check if there is

any leak or short-circuit on the loaded

circuit, and service it if defective.

P-ON+3.5V is not output.

Is approximately +3.5V voltage supplied to the

cathode of D670?

Ye s

Check C670, D670 and their periphery circuit, and

service it if defective.

FLOW CHART NO.14

Check if there is any leak or short-circuit on the loaded

circuit, and service it if def

ective.

AMP+24V is not output.

Is approximately +27V voltage supplied to the

cathode of D656?

Ye s

Check C654, D656, D657 and their periphery circuit,

and service it if defective.

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Magnavox 40MF430B - Service Manual Page 31

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