Magnavox 19MF301B Service Manual download pdf (Page 40)

8-9 FL11.0BTR

Is approximately +5V voltage supplied to Pin(1) of

IC631?

Ye s

Check Q634, D650 and their periphery circuit, and

service it if de

fective.

See FLOW CHART No.5 <INV+31V is not output.>

AL+3.3V is not output.

FLOW CHART NO.14

Is approximately +34V voltage supplied to the

collector of Q634?

Ye s

Replace IC631.

Check C636, D636, D637 and their periphery

circuit, and service it if defective.

Check Q202, Q203, D204, P-ON-H1

line and their

periphery circuit, and ser

vice it if defective.

Replace Q206.

Is approximately -8V voltage supplied to the

base of Q206?

Ye s

LCD-7.1V is not output.

FLOW CHART NO.15

Is approximately

-9V voltage supplied to the

anode of D636?

Ye s

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 136 137

No comments

Magnavox 19MF301B Service Manual Page 40