| Author |
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| psychojim40 |
 Posted: Sun Dec 17, 2006 4:17 pm Post subject: AV 27820 AV27850 |
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I find all the bugs !!
Replace D422 (1N4761A,NTE5064A),C425 (100uf/35V),C425 (470uf/35)R526 1,8 Ohms Termal resistor IC421 (Vert.Deflec) and went to service menu to unlock channel and sound with the orinal remote control by pressing 2 button at same time (menu/mute) |
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| edolago |
| Posted: Sat Jun 17, 2006 5:45 pm Post subject: |
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Or, maybe the yoke itself is defective. It has some shorted wiring of the upper horizontal winding. You can pull out the yoke from the tube and check if some windings are corruded or shorted.  |
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| edolago |
| Posted: Sat Jun 17, 2006 5:37 pm Post subject: |
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| Is it a KEYSTONE? If it is, Check again your deflection yoke. That trouble is an open upper horizontal yoke winding. If you check the continuity, you can not determine the open upper winding because it is connected in parallel with the lower horizontal winding. Mostly it is a corroded terminal that causes it to open. |
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| edolago |
| Posted: Sat Jun 17, 2006 12:23 am Post subject: Re: JVC Mod AV27820 screen trouble |
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| psychojim40 wrote: |
 Hi every one, I've a trouble with my JVC AV27820. When I put at ON, the both top corner still black but the screen appeared. After 10 second, it shuting of by itself and the power light blink. The deflection seem to be ok ( I,ve seen there continuity in the wire) I really don't know what's going on !!!! Any help or service manual about this product will be really appreciated. I've already the first 6 page of the service manual on 23 and not able to find it!!!! |
You can find the service manual of that model at www.icxinyi.com/EN.
Do you mean both top and bottom sides of its screen appeared black? Mostly, it is caused by leaky capacitors of its vertical section. About the shutting-off, maybe it is another kind of trouble which is not related to the vertical. Some tv's have their shutdown protection which is connected from the vertical to the horizontal oscillator/driver.  |
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| psychojim40 |
| Posted: Fri Jun 16, 2006 8:54 pm Post subject: JVC Mod AV27820 screen trouble |
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| Hi every one, I've a trouble with my JVC AV27820. When I put at ON, the both top corner still black but the screen appeared. After 10 second, it shuting of by itself and the power light blink. The deflection seem to be ok ( I,ve seen there continuity in the wire) I really don't know what's going on !!!! Any help or service manual about this product will be really appreciated. I've already the first 6 page of the service manual on 23 and not able to find it!!!! |
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