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Toshiba Model # CF2765K Chassis #: 9010 Vertical Problem
You missed one cap....Near the jungle IC.
kip -- "Watch the return E-Mail addy its false" "Robert McPherson" wrote in message om... Set originally had bad linearity at top & side bowing (pincusion) problems. I have fixed both of those problems, but still have about 1" of black space at bottom of raster. There is no available Howard Sams Photofact on this model or chassis that was produced. I have changed all of the usual capacitors, and replaced the AN5521 vertical IC. All of the waveforms going into and out of the IC appear normal. All of the DC voltages on the 7 pins of the IC are normal, EXCEPT possibly for pin 2 (Vertical output) The DC voltage is almost 8 volts, but the DC voltage called for on a similar? Toshiba TV (Model # CF2665K)for which I do have a Photofact calls for 15 volts on Pin 2. The diagram I have seems to be very closely related, but it does not show a pincusion board which my set has. I am wondering if the DC voltage on pin2 of my customers TV should also be 15 volts, and if so, why is it lower About 8 volts) than normal. I can not tell from my diagram where the DC voltage on pin 2 should be coming from. Any ideas? Anyone have a scanned section of the exact schematic which you are willing to Email me as an attachment? Thanks for your help. Robert McPherson. |
Toshiba Model # CF2765K Chassis #: 9010 Vertical Problem
You missed one cap....Near the jungle IC.
kip -- "Watch the return E-Mail addy its false" "Robert McPherson" wrote in message om... Set originally had bad linearity at top & side bowing (pincusion) problems. I have fixed both of those problems, but still have about 1" of black space at bottom of raster. There is no available Howard Sams Photofact on this model or chassis that was produced. I have changed all of the usual capacitors, and replaced the AN5521 vertical IC. All of the waveforms going into and out of the IC appear normal. All of the DC voltages on the 7 pins of the IC are normal, EXCEPT possibly for pin 2 (Vertical output) The DC voltage is almost 8 volts, but the DC voltage called for on a similar? Toshiba TV (Model # CF2665K)for which I do have a Photofact calls for 15 volts on Pin 2. The diagram I have seems to be very closely related, but it does not show a pincusion board which my set has. I am wondering if the DC voltage on pin2 of my customers TV should also be 15 volts, and if so, why is it lower About 8 volts) than normal. I can not tell from my diagram where the DC voltage on pin 2 should be coming from. Any ideas? Anyone have a scanned section of the exact schematic which you are willing to Email me as an attachment? Thanks for your help. Robert McPherson. |
Toshiba Model # CF2765K Chassis #: 9010 Vertical Problem
Check that diode close to the heat sink for leakage.
kip -- "Watch the return E-Mail addy its false" "Robert McPherson" wrote in message om... Set originally had bad linearity at top & side bowing (pincusion) problems. I have fixed both of those problems, but still have about 1" of black space at bottom of raster. There is no available Howard Sams Photofact on this model or chassis that was produced. I have changed all of the usual capacitors, and replaced the AN5521 vertical IC. All of the waveforms going into and out of the IC appear normal. All of the DC voltages on the 7 pins of the IC are normal, EXCEPT possibly for pin 2 (Vertical output) The DC voltage is almost 8 volts, but the DC voltage called for on a similar? Toshiba TV (Model # CF2665K)for which I do have a Photofact calls for 15 volts on Pin 2. The diagram I have seems to be very closely related, but it does not show a pincusion board which my set has. I am wondering if the DC voltage on pin2 of my customers TV should also be 15 volts, and if so, why is it lower About 8 volts) than normal. I can not tell from my diagram where the DC voltage on pin 2 should be coming from. Any ideas? Anyone have a scanned section of the exact schematic which you are willing to Email me as an attachment? Thanks for your help. Robert McPherson. |
Toshiba Model # CF2765K Chassis #: 9010 Vertical Problem
Check that diode close to the heat sink for leakage.
kip -- "Watch the return E-Mail addy its false" "Robert McPherson" wrote in message om... Set originally had bad linearity at top & side bowing (pincusion) problems. I have fixed both of those problems, but still have about 1" of black space at bottom of raster. There is no available Howard Sams Photofact on this model or chassis that was produced. I have changed all of the usual capacitors, and replaced the AN5521 vertical IC. All of the waveforms going into and out of the IC appear normal. All of the DC voltages on the 7 pins of the IC are normal, EXCEPT possibly for pin 2 (Vertical output) The DC voltage is almost 8 volts, but the DC voltage called for on a similar? Toshiba TV (Model # CF2665K)for which I do have a Photofact calls for 15 volts on Pin 2. The diagram I have seems to be very closely related, but it does not show a pincusion board which my set has. I am wondering if the DC voltage on pin2 of my customers TV should also be 15 volts, and if so, why is it lower About 8 volts) than normal. I can not tell from my diagram where the DC voltage on pin 2 should be coming from. Any ideas? Anyone have a scanned section of the exact schematic which you are willing to Email me as an attachment? Thanks for your help. Robert McPherson. |
Toshiba Model # CF2765K Chassis #: 9010 Vertical Problem
Make sure you changed these caps....
C301 And C305 Both 1 Uf @ 50v 105 Degree C. and C308 220uf 35v If problem still exists , check the fusible resistor value that feeds B+ to the IC...if it increases it will cause the circuit to choke. -- ========================== Jeff Stielau Shoreline Electronics Repair 344 East Main Street Clinton,CT 06413 860-399-1861 860-664-3535 (fax) ========================== "If you push something hard enough it will fall over." Fudd's First Law of Opposition - Sir Sidney Fudd "Robert McPherson" wrote in message om... Set originally had bad linearity at top & side bowing (pincusion) problems. I have fixed both of those problems, but still have about 1" of black space at bottom of raster. There is no available Howard Sams Photofact on this model or chassis that was produced. I have changed all of the usual capacitors, and replaced the AN5521 vertical IC. All of the waveforms going into and out of the IC appear normal. All of the DC voltages on the 7 pins of the IC are normal, EXCEPT possibly for pin 2 (Vertical output) The DC voltage is almost 8 volts, but the DC voltage called for on a similar? Toshiba TV (Model # CF2665K)for which I do have a Photofact calls for 15 volts on Pin 2. The diagram I have seems to be very closely related, but it does not show a pincusion board which my set has. I am wondering if the DC voltage on pin2 of my customers TV should also be 15 volts, and if so, why is it lower About 8 volts) than normal. I can not tell from my diagram where the DC voltage on pin 2 should be coming from. Any ideas? Anyone have a scanned section of the exact schematic which you are willing to Email me as an attachment? Thanks for your help. Robert McPherson. |
Toshiba Model # CF2765K Chassis #: 9010 Vertical Problem
Make sure you changed these caps....
C301 And C305 Both 1 Uf @ 50v 105 Degree C. and C308 220uf 35v If problem still exists , check the fusible resistor value that feeds B+ to the IC...if it increases it will cause the circuit to choke. -- ========================== Jeff Stielau Shoreline Electronics Repair 344 East Main Street Clinton,CT 06413 860-399-1861 860-664-3535 (fax) ========================== "If you push something hard enough it will fall over." Fudd's First Law of Opposition - Sir Sidney Fudd "Robert McPherson" wrote in message om... Set originally had bad linearity at top & side bowing (pincusion) problems. I have fixed both of those problems, but still have about 1" of black space at bottom of raster. There is no available Howard Sams Photofact on this model or chassis that was produced. I have changed all of the usual capacitors, and replaced the AN5521 vertical IC. All of the waveforms going into and out of the IC appear normal. All of the DC voltages on the 7 pins of the IC are normal, EXCEPT possibly for pin 2 (Vertical output) The DC voltage is almost 8 volts, but the DC voltage called for on a similar? Toshiba TV (Model # CF2665K)for which I do have a Photofact calls for 15 volts on Pin 2. The diagram I have seems to be very closely related, but it does not show a pincusion board which my set has. I am wondering if the DC voltage on pin2 of my customers TV should also be 15 volts, and if so, why is it lower About 8 volts) than normal. I can not tell from my diagram where the DC voltage on pin 2 should be coming from. Any ideas? Anyone have a scanned section of the exact schematic which you are willing to Email me as an attachment? Thanks for your help. Robert McPherson. |
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