Home |
Search |
Today's Posts |
|
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. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to sci.electronics.repair
|
|||
|
|||
CTC187 picture too big
Found a shorted diode in the pincushion circuit, ordered an exact
replacement part and installed it. Pin is now fine however it appears the image is a bit too large, I'm not sure yet how large but when I change channels the very edge of the text runs past the edge of the screen. Pic looks good other than this fault, nice and bright with good color. Is there a common cause of this? I almost wonder if the EEPROM got slightly corrupted though with everything else working fine I'm worried that a fault may still be present so I hesitate to adjust anything. |
#2
Posted to sci.electronics.repair
|
|||
|
|||
CTC187 picture too big
If you found CR4403 bad, did you check C4407 with a cap checker?
Check the other big diodes, & blue caps in the area. Also, is the B+ too high? Dani. James Sweet wrote: Found a shorted diode in the pincushion circuit, ordered an exact replacement part and installed it. Pin is now fine however it appears the image is a bit too large, I'm not sure yet how large but when I change channels the very edge of the text runs past the edge of the screen. Pic looks good other than this fault, nice and bright with good color. Is there a common cause of this? I almost wonder if the EEPROM got slightly corrupted though with everything else working fine I'm worried that a fault may still be present so I hesitate to adjust anything. |
#3
Posted to sci.electronics.repair
|
|||
|
|||
CTC187 picture too big
Dani wrote:
If you found CR4403 bad, did you check C4407 with a cap checker? Check the other big diodes, & blue caps in the area. Also, is the B+ too high? Dani. I checked the capacitor both for value with my multimeter and for leakage by charging it up to rated voltage with a variable HV PSU, didn't think to check ESR on it though. I'll check the other caps and diodes, what should B+ be on this set? 180V? |
#4
Posted to sci.electronics.repair
|
|||
|
|||
CTC187 picture too big
Standby B+ can be about 145 volts, & about 140 running....approx.
You didn't say if the pix is too high also...B+ could be too high. I don't think the EEPROM is corrupt, but if it's just too wide, & not keystoned, it MAY need a tweak. Dani. James Sweet wrote: Found a shorted diode in the pincushion circuit, ordered an exact replacement part and installed it. Pin is now fine however it appears the image is a bit too large, I'm not sure yet how large but when I change channels the very edge of the text runs past the edge of the screen. Pic looks good other than this fault, nice and bright with good color. Is there a common cause of this? I almost wonder if the EEPROM got slightly corrupted though with everything else working fine I'm worried that a fault may still be present so I hesitate to adjust anything. |
#5
Posted to sci.electronics.repair
|
|||
|
|||
CTC187 picture too big
Dani wrote:
Standby B+ can be about 145 volts, & about 140 running....approx. You didn't say if the pix is too high also...B+ could be too high. I don't think the EEPROM is corrupt, but if it's just too wide, & not keystoned, it MAY need a tweak. Dani. James Sweet wrote: Found a shorted diode in the pincushion circuit, ordered an exact replacement part and installed it. Pin is now fine however it appears the image is a bit too large, I'm not sure yet how large but when I change channels the very edge of the text runs past the edge of the screen. Pic looks good other than this fault, nice and bright with good color. Is there a common cause of this? I almost wonder if the EEPROM got slightly corrupted though with everything else working fine I'm worried that a fault may still be present so I hesitate to adjust anything. It's pretty hard to tell really, when I get the chance I'll drag the DVD player down there so I can put a test pattern on it. |
#6
Posted to sci.electronics.repair
|
|||
|
|||
CTC187 picture too big
|
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Making a simple QSWO picture frame... (w/pics) | Woodworking | |||
Sony KV-32S40 has audio but no picture | Electronics Repair | |||
No picture but sound on SONY KV-35V36 | Electronics Repair | |||
HELP needed. Was CRT arcing now Fuzzy Picture | Electronics Repair | |||
Picture gets wider than the monitor | Electronics Repair |