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
|
|||
|
|||
Lighter horizontal line on Sony TV
"Marco De Vitis" wrote in message ... Hi, I have a KV-X2531A Sony TV (chassis AE-1C) which is recently showing a lighter horizontal area on the top of the screen, a line placed more or less 1/4 of the total screen size from the top. It appears after 10 minutes or so, when the TV gets hot. Actually, the area seems to be slightly distorted, as if the lighter line is indeed the result of an "accumulation" of horizontal lines. BTW, the TV is the same where I had the disappearing color problem, see my old thread "Intermittent color/bw on Sony TV". Some time ago I swapped the two variable capacitors near the oscillators to work around the color problem, and everthing went perfect for a while. Recently, the strange line appeared. Today I tried swapping the capacitors back to their original positions, but the situation is exactly the same: the color is ok, but the line is still there. What might be causing this? I didn't touch the capacitor values... can their swapping be related to the new problem? Or is it a new and totally unrelated problem? Thanks in advance. -- Ciao, Marco. Sounds like bad caps in the vertical output stage. |
#2
|
|||
|
|||
Lighter horizontal line on Sony TV
Il 19/08/2003, alle ore 15:50, Marco De Vitis ha scritto:
Today I tried swapping the capacitors back to their original positions, but the situation is exactly the same: the color is ok, but the line is still there. Just for the record, soon after writing my message the line disappeared, everything seems ok now. Who knows... I might guess it was some kind of leftover from the previous situation (the two swapped capacitors), but it sounds to me like nonsense. -- Ciao, Marco. ...."Dig?", Bill Bruford's Earthworks 1989 |
#3
|
|||
|
|||
Lighter horizontal line on Sony TV
I have the very same problem on a KV29 100Hz (FX chassis). The upper part of the screen is "folded" on itself. The first symptomI got was no vertical deflection at all. I got just a very brigth horizontal line in the middle of the screen. I found that the resistors in series to the output transistor where "well done!". I replaced them with a couple of higher wattage resistors mounted on a small headsink and the screen was back apart for that strange "fold". I found that a capacitor was also damaged (a 3.3uF filter capacitor on the supply line of the above PNP/NPN couple) and also a diode in the same area was leaky. On my chassis the resistors were called R458/R459, the capacitor is C524 and the diode is D506. All of them are in the vertical drive stage. I bet you have the same problem. Good luck Fabio "Marco De Vitis" ha scritto nel messaggio ... Hi, I have a KV-X2531A Sony TV (chassis AE-1C) which is recently showing a lighter horizontal area on the top of the screen, a line placed more or less 1/4 of the total screen size from the top. It appears after 10 minutes or so, when the TV gets hot. Actually, the area seems to be slightly distorted, as if the lighter line is indeed the result of an "accumulation" of horizontal lines. BTW, the TV is the same where I had the disappearing color problem, see my old thread "Intermittent color/bw on Sony TV". Some time ago I swapped the two variable capacitors near the oscillators to work around the color problem, and everthing went perfect for a while. Recently, the strange line appeared. Today I tried swapping the capacitors back to their original positions, but the situation is exactly the same: the color is ok, but the line is still there. What might be causing this? I didn't touch the capacitor values... can their swapping be related to the new problem? Or is it a new and totally unrelated problem? Thanks in advance. -- Ciao, Marco. ..."The Juliet Letters", Elvis Costello & The Brodsky Quartet 1993 |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Sony KV-32XBR10 TV Module Protector & Horizontal Coil | Electronics Repair | |||
Horizontal line problem ( not the one in the FAQ) | Electronics Repair | |||
Sony G500 Monitor Repair | Electronics Repair | |||
Sony G500 Monitor Repair | Electronics Repair | |||
Sony G410R Monitor problem (and bad Sony support) | Electronics Repair |