Pulsating Hitachi TV screen

[propman]

Hitachi

Model TE-4400

Chassis: NP83LX3 (I think....not quite sure)


Dead on arrival - no raster, no audio, protection circuit would cut in
upon power up. Faint arching sound.


Found cracked solder joints on three components by the FBT - resoldered
them.


Unit now powers on correctly, high voltage comes up.

After a short time after power up (around 30 seconds or so):

- plusing sound can be heard through speaker
- raster is pulsing from the center of the CRT (looks like a '60's tie-
dye light show.


I will be checking around the net for any information concerning these
symptoms but was wondering if this sounds familar to any of the
participants here.


Any thoughts or tips would be most appreciated.....thanks!

 

[David Naylor]

Hitachi

Model TE-4400

Chassis: NP83LX3 (I think....not quite sure)


Dead on arrival - no raster, no audio, protection circuit would cut in
upon power up. Faint arching sound.


Found cracked solder joints on three components by the FBT - resoldered
them.


Unit now powers on correctly, high voltage comes up.

After a short time after power up (around 30 seconds or so):

- plusing sound can be heard through speaker
- raster is pulsing from the center of the CRT (looks like a '60's tie-
dye light show.


I will be checking around the net for any information concerning these
symptoms but was wondering if this sounds familar to any of the
participants here.


Any thoughts or tips would be most appreciated.....thanks!

sounds like a HV leak. check your anode leads . make sure they are
locked correctly in flyback and at crt