No Picture, No Sound - Sharp 21N52-E1 Service Manual

CIRCUITS TO BE CHECKED:
Tuner.
l
. PIF.
Automatic Gain Control.
l
I
Noise increases but no signal is
received.
Check the tuner BL, BH, Bu and
+ B2 biases.
+ 62 must be approx. IZV.
preset switch at VHF position.
band switch at UHF position.
Check the tuner AGC.
I
Normal Abnormal

NO PICTURE, NO SOUND

Does the noise level increqse at max.
Contrast, Brightness and Sound controls?
I
16
I
Picture noise decreases but sound
level varies greatly.
I
Does the I2V +B appear at pin
(11) of connector- ?