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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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27" Hitachi tv model:TN-77000,chassis:G9LXU
Check to see if the biases to the CRT guns are correct. Check the high
voltage, and the main power supply outputs. By your description, this sounds like a weak CRT. Doing the proper checks will verify this. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm Instruments http://www.zoom-one.com/glgtech.htm ========================================= "Sidney" wrote in message om... 27" Hitachi stereo tv model:TN-77000,chassis:G9LXU,year:Aug 1990 wooden cabinet (table top model,not a floor model)assembled in Point Claire,Quebe,Canada. The tv has HV,sound but no raster at all not even OSD after about few minutes the picture comes in very dark,I increased the brightness on the flyback but the retrace lines are barely visible,I replaced the 4.7 Uf,250v heater cap on the crt board which was fine but still dark screen.The 3 guns are lit bright,I can download the free service manual from: http://www.hitachiserviceusa.com but I would rather have a "quick answer" than to spend hours troubleshooting,here are other models that share the same chassis: GT-7881K CT-7881 TE-67002 To familiarize you with this chassis here are some common parts: CRT Panasonic # M68JUA98X (made in USA) Flyback # 2435376 (location:T702) Yoke # 2444251 IC401=LA4270 (sound o/p ic) Q702=2SD1959 IC601=UPC1498H (vert o/p ic) I looked at 5 or so repair tips sites but found no common repair tips for such a chassis with such a problem,any have any tips for me?.Thanks in advance. Sidney Dartmouth,Nova Scotia Canada http://www.herald.ns.ca/cgi-bin/home...+1019+Business http://www.herald.ns.ca/stories/2002...ss126.raw.html |
#3
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27" Hitachi tv model:TN-77000,chassis:G9LXU
Check to see if the biases to the CRT guns are correct. Check the high
voltage, and the main power supply outputs. By your description, this sounds like a weak CRT. Doing the proper checks will verify this. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm Instruments http://www.zoom-one.com/glgtech.htm ========================================= "Sidney" wrote in message om... 27" Hitachi stereo tv model:TN-77000,chassis:G9LXU,year:Aug 1990 wooden cabinet (table top model,not a floor model)assembled in Point Claire,Quebe,Canada. The tv has HV,sound but no raster at all not even OSD after about few minutes the picture comes in very dark,I increased the brightness on the flyback but the retrace lines are barely visible,I replaced the 4.7 Uf,250v heater cap on the crt board which was fine but still dark screen.The 3 guns are lit bright,I can download the free service manual from: http://www.hitachiserviceusa.com but I would rather have a "quick answer" than to spend hours troubleshooting,here are other models that share the same chassis: GT-7881K CT-7881 TE-67002 To familiarize you with this chassis here are some common parts: CRT Panasonic # M68JUA98X (made in USA) Flyback # 2435376 (location:T702) Yoke # 2444251 IC401=LA4270 (sound o/p ic) Q702=2SD1959 IC601=UPC1498H (vert o/p ic) I looked at 5 or so repair tips sites but found no common repair tips for such a chassis with such a problem,any have any tips for me?.Thanks in advance. Sidney Dartmouth,Nova Scotia Canada http://www.herald.ns.ca/cgi-bin/home...+1019+Business http://www.herald.ns.ca/stories/2002...ss126.raw.html |
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