#1
|
||||
|
||||
Sony 5-303W Blank Screen
|
#2
|
||||
|
||||
It looks like the Horizontal Frequency is way off. Does it have sound, can you see any movement at all on the screen?
|
#3
|
||||
|
||||
Wires on mine are very brittle - perhaps you broke a wire or two? Check the voltages around the horizontal oscillator and you'll likely find a problem. Crisp looking picture, just need to pull the oscillator in to sync.
Cheers,
__________________
Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! |
#4
|
||||
|
||||
Quote:
Perhaps the 2SC41 transistor is bad? It does get fairly warm. |
#5
|
||||
|
||||
Going with hoz freq off is there a sub hold on the PCB ?
If so may have bad spot. If the 2SC41 is the hoz out it may be cause the freq is off. Transistors almost always work or not so I dont think thats it. In any case dont run it long if its hot or it will short. 73 Zeno |
Audiokarma |
#6
|
||||
|
||||
I noticed on my set it has some adjustments (four pots) right above the speaker, probably Vert height and lin but maybe one of them is the Sub Horiz adjustment?
|
#7
|
||||
|
||||
Quote:
Lucky for me chesters has all these transistors in stock. |
#8
|
||||
|
||||
Quote:
jr |
#9
|
||||
|
||||
Quote:
I'm thinking the bias transistor it self is bad. |
#10
|
||||
|
||||
Does tweeking the Horizontal Frequency pot have *any* effect at all on the number or angle of those bright horizontal lines? have you tried cleaning the pot?
jr |
Audiokarma |
#11
|
||||
|
||||
It shifts them around a little, but it has almost no effect on them at all.
|
#12
|
||||
|
||||
Quote:
jr |
#13
|
||||
|
||||
Quote:
Turning the horz. on the front of the set moves the lines around a little. I'm at a bit of a loss. |
#14
|
|||
|
|||
Did you try adjusting L15, the horizontal stabilizer transformer coil? It looks like a square transistor radio IF coil. It's mounted on the Sweep circuit board, center left
viewed from the component side. Ed |
#15
|
||||
|
||||
I see you have it tuned to channel 13. Have you tried the set with a digital converter on channel 3 or 4?
__________________
|
Audiokarma |
|
|