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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Sanyo DS31590 vertical problem
Hi all. I inherited this set from a tv repairman who was closing up shop. He couldn't repair it so I decided to give it a go. The picture has vertical fold over at the top and is pulled up from the bottom. I've replaced all the electrolytic caps in the vertical circuit and the jungle, eeprom , and vertical output ics. Other capacitors in the vertical circuit have been subbed. Resistors have been checked in circuit and appear to be within tolerance. Adjusting the vertical parameters in the service menu doesn't change the symptoms. The capacitors in the pincushion circuit that can affect vertical height have been subbed. If anyone has ever seen such a problem with this chassis, I'd appreciate their assistance. Thanks. Chuck |
#2
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Sanyo DS31590 vertical problem
Keep checking ,you have missed the 2 bad caps.
kip -- "Watch the return E-Mail addy its false" "Chuck" wrote in message ... Hi all. I inherited this set from a tv repairman who was closing up shop. He couldn't repair it so I decided to give it a go. The picture has vertical fold over at the top and is pulled up from the bottom. I've replaced all the electrolytic caps in the vertical circuit and the jungle, eeprom , and vertical output ics. Other capacitors in the vertical circuit have been subbed. Resistors have been checked in circuit and appear to be within tolerance. Adjusting the vertical parameters in the service menu doesn't change the symptoms. The capacitors in the pincushion circuit that can affect vertical height have been subbed. If anyone has ever seen such a problem with this chassis, I'd appreciate their assistance. Thanks. Chuck |
#3
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Sanyo DS31590 vertical problem
Unfortunately, this isn't a normal capacitor problem though the
symptoms are the same. I have a schematic and over 30 years of repair experience but thanks for the suggestion. Chuck On Mon, 28 Jul 2003 08:20:08 -0400, "john" wrote: Keep checking ,you have missed the 2 bad caps. kip |
#4
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Sanyo DS31590 vertical problem
Chuck:
Have you done a ring test on the vertical deflection coils in the yoke?? Also check any of the diodes in the circuitry..... etc. -- Best Regards, Daniel Sofie Electronics Supply & Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "chuck" wrote in message ... Unfortunately, this isn't a normal capacitor problem though the symptoms are the same. I have a schematic and over 30 years of repair experience but thanks for the suggestion. Chuck On Mon, 28 Jul 2003 08:20:08 -0400, "john" wrote: Keep checking ,you have missed the 2 bad caps. kip |
#5
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Sanyo DS31590 vertical problem
If you are very sure that you ESR checked, and replaced ALL the bad
caps, then the only thing you have left are some base components, and the deflection yoke. The caps you missed are the bad ones... I am convinced that you still have a bad cap in this one, or the deflection yoke is defective. In some sets, there are some small caps, and or thermo resistors in the deflection yoke for compensation. This may not be the case for this set, but it is a thought. I have had resistors go sort of opened in the deflection circuits causing this type of fault as well. But... I am still sort of convinced by your description, and by past experience there is a cap or two that you missed! -- Greetings, Jerry Greenberg GLG Technologies GLG ============================================== WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm Instruments http://www.zoom-one.com/glgtech.htm ============================================== "Chuck" wrote in message ... Hi all. I inherited this set from a tv repairman who was closing up shop. He couldn't repair it so I decided to give it a go. The picture has vertical fold over at the top and is pulled up from the bottom. I've replaced all the electrolytic caps in the vertical circuit and the jungle, eeprom , and vertical output ics. Other capacitors in the vertical circuit have been subbed. Resistors have been checked in circuit and appear to be within tolerance. Adjusting the vertical parameters in the service menu doesn't change the symptoms. The capacitors in the pincushion circuit that can affect vertical height have been subbed. If anyone has ever seen such a problem with this chassis, I'd appreciate their assistance. Thanks. Chuck |
#6
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Sanyo DS31590 vertical problem
I've replaced diodes, tested all resistors out of circuit and replaced
all capacitors so I think you are right about it having to be the yoke. My ringer is at work so I will take it home tonight to do the test. I haven't seen a yoke cause a problem like this since tube bw sets were common. Thank for your help. Chuck. On Mon, 28 Jul 2003 09:48:19 -0700, "Sofie" wrote: Chuck: Have you done a ring test on the vertical deflection coils in the yoke?? Also check any of the diodes in the circuitry..... etc. |
#7
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Sanyo DS31590 vertical problem
The problem turned out to be the yoke which is only available with the
crt. Thanks for the help. Chuck On Mon, 28 Jul 2003 14:26:11 -0400, "Jerry G." wrote: If you are very sure that you ESR checked, and replaced ALL the bad caps, then the only thing you have left are some base components, and the deflection yoke. The caps you missed are the bad ones... I am convinced that you still have a bad cap in this one, or the deflection yoke is defective. In some sets, there are some small caps, and or thermo resistors in the deflection yoke for compensation. This may not be the case for this set, but it is a thought. I have had resistors go sort of opened in the deflection circuits causing this type of fault as well. But... I am still sort of convinced by your description, and by past experience there is a cap or two that you missed! |
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