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. |
|
LinkBack | Thread Tools | Display Modes |
#1
|
|||
|
|||
RCA Proscan 27" TV no vertical
This is an oldie, the model slips my mind, but its a CTC167R chassis, thats
a vertical wood floor model. This set has worked flawlessly since the date it was purchased new at stienburgs(now defunct). about a month ago, the vertical began to foldover at the top. When you first would turn the set on, the foldover would appear. as it ran for an hour it would retract and clear up. I knew right there, it has to be a faulty cap in the vert stages. over the course of the 2 months, it got worse and worse, to the point where when you first turned it on, the foldover would reach as far down as the center of the screen. after an hour, it would retract to about a 1/4 of the screen, but it never disappeard. Just today, the set was turned off, and then later in the day, turned back on, BAM no vertical deflection. none. zippo. The OSD is there, the sound is there, but no pic, no vert. just a line with OSD. Im believing that the cap has either shorted, or opened up. I did some research in the faq, and euras and found that supply diodes open, or a resistor changes in value. I also found a pinout of the IC, and low voltages would indicate faulty IC, or faulty coupleing cap. I checked out the vcc volts to the IC, they are dead on. The IC isnt the problem. I checked the resistor, and the diodes it suggested in the euras database, and they are fine. the supplies are good. Any ideas if this is a common problem? or maybe this has happened before, and know what cap it is? I dont have an ESR meter, but I have a DMM and a scope. |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Workmate WM425 vertical clamp truly vertical? | Woodworking | |||
Big battle with WEIRD vertical deflection problem in PTK195 chassis. | Electronics Repair | |||
Proscan Vertical Hold | Electronics Repair | |||
Sanyo DS31590 vertical problem | Electronics Repair |