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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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Toshiba CF2052A Vertical Problem
I have a Toshiba CF2052A TV that is about 12 years old. It appears there is
a problem in the area of the vertical circuitry because the picture is starting to stretch out in the vertical direction (long faces, text going off screen and the like). I have repaired some of my Toshibas in the past with the help of this group and I hope someone will be able to send along some hints as to which component(s) could be the cause of this problem. I do not have the schematic however I will be able to locate the parts on the circuit board. Most likely I am hoping a new capacitor or two will fix the problem. I doubt very much if there is a control that adjusts vertical as in the "old days". Thank you very much in advance for any advice, it is greatly appreciated. The TV has a great picture and I dont want to dump it yet if it can be saved. Lou Email: |
#2
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Toshiba CF2052A Vertical Problem
Louis, try changing C301 and C305, 2.2uf 50 volt caps, maybe 308 220uf 35V
"Louis Leciejewski" wrote in message ... I have a Toshiba CF2052A TV that is about 12 years old. It appears there is a problem in the area of the vertical circuitry because the picture is starting to stretch out in the vertical direction (long faces, text going off screen and the like). I have repaired some of my Toshibas in the past with the help of this group and I hope someone will be able to send along some hints as to which component(s) could be the cause of this problem. I do not have the schematic however I will be able to locate the parts on the circuit board. Most likely I am hoping a new capacitor or two will fix the problem. I doubt very much if there is a control that adjusts vertical as in the "old days". Thank you very much in advance for any advice, it is greatly appreciated. The TV has a great picture and I dont want to dump it yet if it can be saved. Lou Email: |
#3
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Toshiba CF2052A Vertical Problem
caps in the vertical section are leaking, or high in ESR.
change all the caps in the vert section, it should clear it up, and prevent future problems in that area. "Louis Leciejewski" wrote in message ... I have a Toshiba CF2052A TV that is about 12 years old. It appears there is a problem in the area of the vertical circuitry because the picture is starting to stretch out in the vertical direction (long faces, text going off screen and the like). I have repaired some of my Toshibas in the past with the help of this group and I hope someone will be able to send along some hints as to which component(s) could be the cause of this problem. I do not have the schematic however I will be able to locate the parts on the circuit board. Most likely I am hoping a new capacitor or two will fix the problem. I doubt very much if there is a control that adjusts vertical as in the "old days". Thank you very much in advance for any advice, it is greatly appreciated. The TV has a great picture and I dont want to dump it yet if it can be saved. Lou Email: |
#4
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Toshiba CF2052A Vertical Problem
C301 and C305 come to mind.
Bright red or green low ESR type caps that leak. You need to obtain 105 degree rated 1uf or 2.2uf 50 volt caps for replacement. Wouldn't hurt to replace the other few electrolytic caps near the vertical IC. BTW one of the culprit caps is actually near the jungle IC. Good Luck, Bill Jr "Louis Leciejewski" wrote in message ... I have a Toshiba CF2052A TV that is about 12 years old. It appears there is a problem in the area of the vertical circuitry because the picture is starting to stretch out in the vertical direction (long faces, text going off screen and the like). I have repaired some of my Toshibas in the past with the help of this group and I hope someone will be able to send along some hints as to which component(s) could be the cause of this problem. I do not have the schematic however I will be able to locate the parts on the circuit board. Most likely I am hoping a new capacitor or two will fix the problem. I doubt very much if there is a control that adjusts vertical as in the "old days". Thank you very much in advance for any advice, it is greatly appreciated. The TV has a great picture and I dont want to dump it yet if it can be saved. Lou Email: |
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Toshiba CF2052A Vertical Problem
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#6
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Toshiba CF2052A Vertical Problem
Bill Jr wrote in message ... C301 and C305 come to mind. Bright red or green low ESR type caps that leak. You need to obtain 105 degree rated 1uf or 2.2uf 50 volt caps for replacement. Wouldn't hurt to replace the other few electrolytic caps near the vertical IC. BTW one of the culprit caps is actually near the jungle IC. Good Luck, Bill Jr Thanks Bill Jr. I assume those capacitors are near the Vertical IC? Is that what you refer to as the "jungle IC"? Per chance do you have a schematic that gives this IC a number? Otherwise I will be able to locate it I am sure from finding C301 and C305 (I assume). Thanks, Lou Email: garfield @anet.com |
#7
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Toshiba CF2052A Vertical Problem
If I'm not mistaken C301 is near the "jungle IC" and C305 is near the
vertical IC. The vertical IC should be 8 or 9 pins and labeled IC301 while the "jungle IC" should be around 48 to 64 pins, in the middle of the board and should be labeled something similar to TA8608. I'm going from memory here so bear with me if the part and pin numbers are not exact. You should be able to get enough info from this (and others') posts to get the job done. Good Luck, Bill Jr "Louis Leciejewski" wrote in message ... Bill Jr wrote in message ... C301 and C305 come to mind. Bright red or green low ESR type caps that leak. You need to obtain 105 degree rated 1uf or 2.2uf 50 volt caps for replacement. Wouldn't hurt to replace the other few electrolytic caps near the vertical IC. BTW one of the culprit caps is actually near the jungle IC. Good Luck, Bill Jr Thanks Bill Jr. I assume those capacitors are near the Vertical IC? Is that what you refer to as the "jungle IC"? Per chance do you have a schematic that gives this IC a number? Otherwise I will be able to locate it I am sure from finding C301 and C305 (I assume). Thanks, Lou Email: garfield @anet.com |
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