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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. |
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#1
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Sharp TV Repair: Grey Screen with White Horizontal lines
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?
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#2
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Sharp TV Repair: Grey Screen with White Horizontal lines
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. |
#3
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Sharp TV Repair: Grey Screen with White Horizontal lines
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 "Bob" wrote in message ... 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 --------------= Posted using GrabIt =---------------- ------= Binary Usenet downloading made easy =--------- -= Get GrabIt for free from http://www.shemes.com/ =- |
#4
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Sharp TV Repair: Grey Screen with White Horizontal lines
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? |
#5
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Sharp TV Repair: Grey Screen with White Horizontal lines
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 |
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