Grundig tv problem


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Grundig tv problem

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JasonTabone
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Mar 3, 2011, 10:32 PM

Post #1 of 2 (728 views)
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Grundig tv problem	Can't Post

I have a grundig tv st70 2500Top and when it is switched on a tricle noise is heard and it is switched off again but the front red led remain on. I had suspect that the smps is being overloaded due to a faulthy component. I had started to chech the secondary diodes by disconnecting them but it is still making the fault. I had disconnected D611,D613,D614, and D612. I had also removed the line output transistor. The problem is still persists. Do you have a remedy for this problem thanks.
Jason Tabone

JasonTabone
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Mar 4, 2011, 11:50 AM

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Re: [JasonTabone] Grundig tv problem [In reply to]	Can't Post

When checking secondary voltages they were too low but when disconnecting D615 diode and checking again the voltages on the secondary they were ok. I had connected again D615 and removing th601 thyristor the voltages are still ok but when i try to start the tv from front button it will go again to standby.

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