Entertainment Center: TVs, Stereos, VCRs and DVDs - Sony projection TV KP-61XBR28
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Don Davis
09-25-04, 09:36 PM
I occasionally work on TVs as a hobby - never for profit, only as a learning experience.
This is a Sony Kp61xbr28 projection TV. It's over ten years old, repair estimate is over $450. I am trying to fix for a friend who already purchased a new set but hates to put this one on the curb. There were no power supplies - on the G board, R604 (.1 ohm, fusible resistor) was open, Q603 & Q604 (2SC4582) shorted. I tried to fix on the bench, but without proper loading, I damaged some diodes. After replacing and checking for shorts on the G board, I checked for shorts on the remainder of the set. With no shorts, I powered up the set, it stayed on for about 3 minutes, picture was ok,and now Q603 and Q604 are shorted. I need to know what are the proper values of resistances to load up all the supplies and test this board on the bench? If I can successfully test on the bench for 30 minutes or so, can you suggest a method to test in the set? I now know why it costs so much to work on this type of set.
Do I need to have the exact Sony replacement parts for Q 603 and Q604? I have the Sony service manual. I'll be glad to share it with you if you want. Thanks in advance for your help.
Don Davis
This is a Sony Kp61xbr28 projection TV. It's over ten years old, repair estimate is over $450. I am trying to fix for a friend who already purchased a new set but hates to put this one on the curb. There were no power supplies - on the G board, R604 (.1 ohm, fusible resistor) was open, Q603 & Q604 (2SC4582) shorted. I tried to fix on the bench, but without proper loading, I damaged some diodes. After replacing and checking for shorts on the G board, I checked for shorts on the remainder of the set. With no shorts, I powered up the set, it stayed on for about 3 minutes, picture was ok,and now Q603 and Q604 are shorted. I need to know what are the proper values of resistances to load up all the supplies and test this board on the bench? If I can successfully test on the bench for 30 minutes or so, can you suggest a method to test in the set? I now know why it costs so much to work on this type of set.
Do I need to have the exact Sony replacement parts for Q 603 and Q604? I have the Sony service manual. I'll be glad to share it with you if you want. Thanks in advance for your help.
Don Davis
zigzag
09-26-04, 07:58 AM
Here's the "trick" to fixing that SONY TV.
I fixed many a SONY for the same problem and in the beginning had the same result as you until I came across a SERVICE NOTE from SONY.
You need to replace Q601,Q602, (sony part # 8-729-927-23) R607,VDR601 Use exact Sony part for VDR601 (sony part #1-809-264-81) Replacement of this part is a must.
Next you need to do two checks. See if the H.O.T. is shorted and or the D1409 (39v zener diode in audio circuit) shorted.
Now comes the fininshing touch. The root of most of these problems that cause these parts to fail is the horizontal frequency transformer that is tied to the H.O.T. Not the flyback although this could also be damaged and you should ring it out but in most cases the solder joints on that horizontal transformer "MUST" be re-soldered.
Good luck
I fixed many a SONY for the same problem and in the beginning had the same result as you until I came across a SERVICE NOTE from SONY.
You need to replace Q601,Q602, (sony part # 8-729-927-23) R607,VDR601 Use exact Sony part for VDR601 (sony part #1-809-264-81) Replacement of this part is a must.
Next you need to do two checks. See if the H.O.T. is shorted and or the D1409 (39v zener diode in audio circuit) shorted.
Now comes the fininshing touch. The root of most of these problems that cause these parts to fail is the horizontal frequency transformer that is tied to the H.O.T. Not the flyback although this could also be damaged and you should ring it out but in most cases the solder joints on that horizontal transformer "MUST" be re-soldered.
Good luck