sony kv 27EXR25 ANU-2 chassis no raster

mloo55 · Joined: 06 Mar 2005 Posts: 16

In short the filaments are on, HV 25kv approxx, audio ok, power supply voltages normal. I moved the screen pot an the raster is visible. I took volatges at IC301 and some values are abnormal like these:
16 5.30 (3.9) 17 5.3 (3. Cool

18 5.35 (3.9) 19 4.29 (5.5)
20 0.26 (2.3) 21 4.8 (6.0) 22 0.26 (1.9) 23 4.33 (6.2)
24 0.26 (1.9) 26 7.0 (4.7) 27 0.20 (7.7) 38 1.8 (2.7)
44 1.90 (2.4) 45 1.7 (2.2)

Readings in parenthesis are from schematic. Is the IK protection the reason these readings change if so what action could I do/
rgds
mloo55
_________________
I am an electronic and aviation technician, working for about 25 years in this branch besides i like reading,computing,movies.

minnie · Joined: 18 Aug 2005 Posts: 2880 Location: Hell

Check R702 on the crt board.

mloo55 · Joined: 06 Mar 2005 Posts: 16

Minnie
I checked r702 and it is ok. another acrion?
rgds
mloo55
_________________
I am an electronic and aviation technician, working for about 25 years in this branch besides i like reading,computing,movies.

minnie · Joined: 18 Aug 2005 Posts: 2880 Location: Hell

Resolder C32 connector on the crt board. 25kv sounds low. When you turn up the screen do you have vertical deflection?

Guest · Posted: Mon Mar 03, 2008 1:35 am Post subject:

Exactly when I move g2 I can see the raster but with the cushion effect.
It fills all the screen.
rgds
mloo55