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Crumbtrail TV Forums: TV Equipment: TV Repair Forum:
Sony kv27exr25 chassis scc-d50f-a no audio no picture

 
 


mloo55
Novice

Feb 17, 2008, 3:30 PM

Post #1 of 12 (249 views)
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Sony kv27exr25 chassis scc-d50f-a no audio no picture Can't Post
This set has no audio nor video .Voltages at the power supply are correct. Took high voltage and read 23kv. Heater are on. katodes voltages are 200v. any suggestion?
rgds
mloo55



mel
Veteran

Feb 17, 2008, 4:49 PM

Post #2 of 12 (245 views)
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Re: [mloo55] Sony kv27exr25 chassis scc-d50f-a no audio no picture [In reply to] Can't Post
Is the standby light blinking and if so, how many times?


mloo55
Novice

Feb 17, 2008, 8:24 PM

Post #3 of 12 (242 views)
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Re: [mel] Sony kv27exr25 chassis scc-d50f-a no audio no picture [In reply to] Can't Post
No led blinking at all, I use the remote control for increase the audio and it works. I turn on/off the tv and it works also. I tried to change channel or al least to hear the sound of the channel and nothing. I do not have picture at all it seems the tv is off.
thanks Mel
Rgds
mlo55


Franky
User

Feb 18, 2008, 12:41 AM

Post #4 of 12 (238 views)
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Re: [mloo55] Sony kv27exr25 chassis scc-d50f-a no audio no picture [In reply to] Can't Post
check bad solder connectionson cm1301 modle on card board
check r702 on crt board (screen voltage)


mel
Veteran

Feb 18, 2008, 9:26 PM

Post #5 of 12 (233 views)
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Re: [mloo55] Sony kv27exr25 chassis scc-d50f-a no audio no picture [In reply to] Can't Post
Sounds like the set is in IK shutdown because of a aging CRT. Try turning up the screen voltage.


Paulpablo
Enthusiast

Feb 19, 2008, 9:50 PM

Post #6 of 12 (217 views)
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Re: [mloo55] Sony kv27exr25 chassis scc-d50f-a no audio no picture [In reply to] Can't Post
Check for bad solder joints on IC561 and regulator board and check Q611.


mloo55
Novice

Feb 22, 2008, 7:26 PM

Post #7 of 12 (202 views)
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Re: [Paulpablo] Sony kv27exr25 chassis scc-d50f-a no audio no picture [In reply to] Can't Post
Thanks buddies
I will follow your steps and will advise.
rgds
mloo55


mloo55
Novice

Mar 1, 2008, 12:22 AM

Post #8 of 12 (178 views)
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Re: [mloo55] Sony kv27exr25 chassis scc-d50f-a no audio no picture [In reply to] Can't Post
Now I have audio,tuning channels but no picture, in a dark room I can see the slight illumination of the upper side of the screen and the rest is dark. Any suggestion
rgds
mloo55


mloo55
Novice

Mar 1, 2008, 8:23 PM

Post #9 of 12 (168 views)
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Re: [mloo55] Sony kv27exr25 chassis scc-d50f-a no audio no picture [In reply to] Can't Post
Here is more info about the problem: Imoved the g2 pot and the raster is on the screen. I checked the volatges on IC301 and found some abnormal values as i show you:
16 5.30 (3.9) 17 5.3 (3.8) 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)
values in parenthesis are from diagram. Can the IK proteccion working and that is the reason of these readings.
please help with your comments
rgds
mloo55


Franky
User

Mar 9, 2008, 11:02 PM

Post #10 of 12 (140 views)
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Re: [mloo55] Sony kv27exr25 chassis scc-d50f-a no audio no picture [In reply to] Can't Post
In Reply To
Now I have audio,tuning channels but no picture, in a dark room I can see the slight illumination of the upper side of the screen and the rest is dark. Any suggestion
rgds
mloo55


mloo55
Novice

Mar 22, 2008, 12:48 AM

Post #11 of 12 (111 views)
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Re: [Franky] Sony kv27exr25 chassis scc-d50f-a no audio no picture [In reply to] Can't Post
Franky
I found the screen pot malfunctioning and the resistor of 1M with value changed, 280k, I changed both parts and the picture was on view but with the cushion problem so I changed the IC and the problem was solved. I have a doubt about the power supply :Is normal tha the STR-S6301 heats hard . The set has been working without any problem for about 6 hours but is normal the heating?
rgds
mloo55


Franky
User

Mar 22, 2008, 5:32 PM

Post #12 of 12 (102 views)
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Re: [mloo55] Sony kv27exr25 chassis scc-d50f-a no audio no picture [In reply to] Can't Post
In Reply To
Franky
I found the screen pot malfunctioning and the resistor of 1M with value changed, 280k, I changed both parts and the picture was on view but with the cushion problem so I changed the IC and the problem was solved. I have a doubt about the power supply :Is normal tha the STR-S6301 heats hard . The set has been working without any problem for about 6 hours but is normal the heating?
rgds
mloo55
check cap 655

 
 
 


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