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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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Sears TV, B+ to high!
Model # 774-15580, "Prima" Model # Q3250. BSC29-N1111 flyback was
arcing, replaced it, then R313 1.0 ohm fusible burnt open, almost right away, after startup, & found vertical IC N301 was bad, now the set5 works great, but the B+ while running is 143 volts dc, it's the usual 90 vdc at standby. Is this normal, for this set? Thanks, Dani. |
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#2
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Sears TV, B+ to high!
On 24 sep, 23:54, Dani wrote:
Model # 774-15580, "Prima" Model # Q3250. BSC29-N1111 flyback was arcing, replaced it, then R313 1.0 ohm fusible burnt open, almost right away, after startup, & found vertical IC N301 was bad, now the set5 works great, but the B+ while running is 143 volts dc, it's the usual 90 vdc at standby. Is this normal, for this set? Thanks, Dani. if in doubt i would replace the caps in the power supply, as these can often lead to excessive b+ if bad. try eserviceinfo.com and look for the schematic. -B |
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