Sharp TV Repair: Grey Screen with White Horizontal lines

[Bob]

Sharp 25j-s100 and the other day when we turned it on is had a grey screen with thin white horizontal lines on all inputs. Anyone have any ideas what it could be?

Thanks


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[[email protected]]

Several different circuit areas could cause the symptom you described.
Provide a little more troubleshooting information for a more specific
suggestion.

Could be a problem in the G1 or G2 voltage to the crt, loss of the
video output main b+, a short in the crt, a problem in the video output
stage, corrupted eeprom data for the crt alignments, and possibly a few
other more remote areas.

The only way to know exactly what it needs to be repaired is to have
the tv properly diagnosed by a qualified technician.

 

[Leonard Caillouet]

The most common cause of this problem is an open resistor. Could also be a
bad FBT, CRT, or a few dozen other things. Start by looking at the bias on
the CRT and the G2 voltage.

Leonard

 

[[email protected]]

Thanks for the info.

One thing I meant to add is the OSD works fine. Does this help narrow
it down? Also, does anyone know where to get schematics for this TV?

 

[[email protected]]

hi
am having similar problem with my AWA model w571 tv only I get a blue
screen with the white lines.
it's been looked at twice in the last week and still problem persists.
I've tried reading the repair warranty and there are references to
1 - trace features to picture tube and tube socket
2 - dislodging foreign material
3- heaters to cathode short circuit on blue gun
4 repair tube socket on **** circuit board
5 - replace heater dropping resistor & check of plater (??) circuit.

Anyone have any info on why problem persists?
it worked fine both times repairedat the workshop but when returned
after 4 days the first time problem returned and within and hour of it
being returned the second time.

john