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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:27CX7B,chassis:M3LXU2
27" Hitachi stereo tv model:27CX7B,chassis:M3LXU2,year:June 96,PIP
with S-VHS input.3 months ago the customer dropped the tv off for repair because of no power so I replaced the following parts: In SMPS: C918=100 Uf,6.3v C920=100 Uf,16v C923=470 Uf,16v In Horizontal driver section: C925=1 Uf,160v In other areas: C729=470 Uf,25v C711=470 Uf,35v C706=470 Uf,16v In vertical section (as preventative maintenance) C606=100 Uf,35v C702=10 Uf,16v C603=10 Uf,16v C613=2.2 Uf,50v C728=330 Uf,6.3v And now three months later the customer called today and said no power again,he has not dropped it off yet but I would like to know if anyone has access to Hitachi repair tips for this model/chassis from all of those tips repair sites. Thanks in advance. Sidney Dartmouth,Nova Scotia (the land of berries) Canada |
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Apperently the tv below is missing the 5v vcc (B+) for the micro and I
have not accessed Hitachi's free service manuals site in several months so my account became automatically deleted so I reapplied and it may take several days so in the mean time can someone e-mail me the schematics dealing with the micro area and power supply?. Thanks in advance. Sidney Dartmouth,Nova Scotia (the land of berries) Canada |
#3
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Apperently the tv above is missing the 5v vcc (B+) for the micro after
extensive troubleshooting I noticed that when I take my Fluke DMM series II model:29's lead and touch pin 8 of IC901=TDA4605-3=Hitachi # 2020392 the tv comes on and works normally but there are times when the tv will not come on then after I touch pin 8 the tv comes on again of course after I press the power button. I replaced the three electrolytics around IC901 but problem is still there,anyone have any tips to allow me to isolate the problem more?.Thanks. Sidney Dartmouth,Nova Scotia (the land of berries) Canada |
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