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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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Hi all
I have a Philips 28ml8805 (FL1.6 or near) with a strange and hard to find problem. The unit is a slow starter which mean that it takes up to 20min to get picture while the sound is comming on after 5s. Sometimes the picture comes after 15s but goes away again after som sec and then it takes several minutes to reappear. The picture is real good (when on) and no mechanical respons from all circuitbords. No problems with the 200v, 141v, 5v, 8v, 13v, 16.5v, the only voltage thats diff a little is 17.5v is 19.5v. I have changed the tda4680 in an atempt to se if it was the cause of the fault but no diff. I think i have checked all resistors around this circuit and found no fault in them, i have resoldered all components in the HOT area and some outside it also, no reaction on the fault. I have seen some that have this problems also on the net but no answer to what it is. I suspect the CRT but thats no option to change, the odd thing is that the picture is WERY good on this unit when working so this would oppose the theori that it is the CRT that are the fault. Is there some that have a clue to whats wrong with this unit? Janne G |
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