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Crumbtrail TV Forums: TV Equipment: TV Repair Forum:
JVC AV-28WR4EKS PROBLEM

 
 


scottc@
New User

Dec 4, 2007, 10:28 AM

Post #1 of 8 (1277 views)
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JVC AV-28WR4EKS PROBLEM Can't Post
My JVC Av-28WR4EKS will turn on and display picture and then turn its self to standby and when take it of standby there is no picture on screen just vertical faint line of green,blue and red.



techchris
Veteran

Dec 4, 2007, 11:02 AM

Post #2 of 8 (1272 views)
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Re: [scottc@] JVC AV-28WR4EKS PROBLEM [In reply to] Can't Post
from memory I think you need to change the flyback tuning capacitor which goes open circuit on these tv's.its usually mounted next to the horizontal out transistor. I dont have the circuit to hand to give you the reference number, sorry, but its a cheap component.


scottc@
New User

Dec 4, 2007, 11:30 AM

Post #3 of 8 (1269 views)
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Re: [techchris] JVC AV-28WR4EKS PROBLEM [In reply to] Can't Post
Thats great cheers, i'll try and get hold of circuit diagram and check it.


scottc@
New User

Dec 5, 2007, 8:40 AM

Post #4 of 8 (1256 views)
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Re: [techchris] JVC AV-28WR4EKS PROBLEM [In reply to] Can't Post
Chris, would it be possible to get the reference number for the capacitor if you have a schematic? I am not able to get my hands on a schematic
Thanks


techchris
Veteran

Dec 5, 2007, 12:36 PM

Post #5 of 8 (1250 views)
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Re: [scottc@] JVC AV-28WR4EKS PROBLEM [In reply to] Can't Post
I think its C521 either 2nF or 3.5nF 1.5Kv depending on model


scottc@
New User

Dec 7, 2007, 9:09 AM

Post #6 of 8 (1236 views)
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Re: [techchris] JVC AV-28WR4EKS PROBLEM [In reply to] Can't Post
Thanks for that chris,
i took out the capacitor in C521 and tested it and it is good. Any other ideas? Another possiblity has been suggested that it could be a possible EEPROM corruption
"press "I" and "Audio Mute" simultaneously on handset. This will put it into test mode"
Not able to get into test mode?
Thanks agian for any help


techchris
Veteran

Dec 7, 2007, 3:03 PM

Post #7 of 8 (1226 views)
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Re: [scottc@] JVC AV-28WR4EKS PROBLEM [In reply to] Can't Post
original post said vertical faint line .do you mean vertical or horizontal.I only ask as lots of people previously dont seem to know the difference.if its horizontal,the fault may just be bad solder joints on the scan ic which need soldering


scottc@
New User

Dec 10, 2007, 8:32 AM

Post #8 of 8 (1207 views)
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Re: [techchris] JVC AV-28WR4EKS PROBLEM [In reply to] Can't Post
Yes there was faint vertical lines, after putting the capacitor back in and soldering a couple of dry joints on the SCART lead connection there is now sound but no picture, there are faint horizontal lines and i get faint fussy picture in the bottom of the screen. i will check all solder joints on the scan IC
cheers

 
 
 


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