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Equipment Repairs => CRT TV forum => Topic started by: ernie on November 27, 2006,20:10:49

Title: sanyo eb8a28 chassis part va1601 what is it
Post by: ernie on November 27, 2006,20:10:49

i got this tv to fix that has lightning damage,cant find anything gone except for the optocoupler and possibly the power supply ic(tn6q04)i want to check this other part out wich is part place va1601 on the board the number on the part is 14c471 it looks like a ceramic cap but i cant get a reading of it does anyone know what va stands for and what this part should read as any info aapreciated

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Post by: mulja on November 28, 2006,17:48:34

What about fuse (ok)???
Don`t worry about va1601. ;)

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Post by: ernie on November 28, 2006,19:40:20

first thing i checked was the fuse which is ok and that is what i cant understand why the fuse is ok when the power supply ic has gone i would have thought it would have blown the fuse even though the fuse is ok and the switch and power cable is ok the set is completly dead no standby or anything this is why i wondered about this va part as something seems to be stopping the power getting to the ic.the capacitor in the power supply gets no charge either any info appreciated

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Post by: mulja on November 29, 2006,05:12:33

If you do not have 320v on capacitor
Check R602 (3.9oM) if he have (open circuit)
Replaced power supply ic TN6Q04 and D615 Zener (18v)


And i had same problem before(no st-by no nothing)
it`s was 3.3v from IC666 to microprocesor i found C201(220n was short circuit)

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Post by: ernie on November 29, 2006,06:38:43

r602 reads ok this is what i cant understand that is the only thing i can find gone in the power supply is the opto for sure,the tn6q04 ic i am not sure about but with nothing else being bad in the power supply makes me wonder if it has gone or not the only thing that made me thinck it has gone is because the two outside legs on the ic read straight across on my ohmmeter but without any specs on this ic i dont know if that is normal or not,anyway i have found c201 and will check that out.thanks for your info sorry about badgering on about this tv but i hate being beaten by it

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Post by: mulja on November 29, 2006,07:04:29

Check resistors R606,R607 if Ok check all resistors
About IC shouldn't read straight across.
And you have 320v on C609 (400v270Mkf) capacitor?

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Post by: ernie on November 29, 2006,14:17:41

checked the resistors all ok now you confirm that the ic is reading wrong i have put one on order and hopefully after fitting that and another opto it works without blowing them.one more thing though their are two optos in it one on the power supply the other on the ht but both the same they have both got p421f on them does the replacement opto have to have the same on it as i have some optos but not that one but the one i have in mind reads exactly the same as the good opto on the ht so should that be suitable to go in the power supply,i know i should get a new one but its like getting blood out of stone to get shops to order the home engeneer things here.thanks again for your help

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Post by: mulja on November 30, 2006,04:43:18

No different bitween just should be 4 pin opto (from any power supply).
And check D615(18v zener) before replace IC.

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Post by: mulja on December 01, 2006,16:53:40

To ernie:
You fix that TV
Post your solution.
I will add in tv repair tips list.

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Post by: ernie on December 01, 2006,17:15:34

good idea just waiting for the ic to come and will let you know what happens    ernie