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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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AKAI TV2851 Dead Set, Voltage are OK
This Set is Dead.... Voltages are ok up to CHOPPER TX , NO LED DISPLAY, All
quiet , Any Ideas? Thanks in advanced  |
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#2
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"Martin" wrote in message news:1127951467.66481ebc2e65e80a7144644e52fbd396@t eranews... This Set is Dead.... Voltages are ok up to CHOPPER TX , NO LED DISPLAY, All quiet , Any Ideas? Thanks in advanced Is the standby voltage present? Also check for bad electrolytic capacitors in the power supply, that can cause a unit not to power up. |
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#3
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On Thu, 29 Sep 2005 00:51:12 +0100, "Martin" put
finger to keyboard and composed: This Set is Dead.... Voltages are ok up to CHOPPER TX , NO LED DISPLAY, All quiet , Any Ideas? Do you mean that the rectified mains voltage is present at the chopper transistor, but that nothing is happening on the secondary side? If so, then I'd be looking for an open startup resistor, usually 100K - 200K, in the base or gate drive to the chopper or to the PWM controller IC. -- Franc Zabkar Please remove one 'i' from my address when replying by email. |
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