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Equipment Repairs => LCD TV forum => Topic started by: scooby-doo on December 17, 2011,08:26:02

Title: Sony KDL32U3000--PSU A1276-472A...Dead/No standby Light
Post by: scooby-doo on December 17, 2011,08:26:02

Hi
Sony KDL32U3000--PSU A1276-472A...Dead/No standby Light
The set is completely dead no standby light no voltages on secondary side....primary fuse ok

Anyone come across this one before.

As always thanks in advance

Title: Re: Sony KDL32U3000--PSU A1276-472A...Dead/No standby Light
Post by: scooby-doo on December 17, 2011,11:48:22

Can someone clarify opto's please

The only thing I can seem to find on the board primary side is an opto is giving a strange reading compared to the other 3 identical ones Sharp PC123

Would 1 faulty opto make the set completely dead? And should the Pin1(Anode) & Pin2(Cathode) always act like a diode...the dodgey one is open both ways when checked with DMM, the other 3, between pins 1&2 act like a diode should...open one way closed the other

"Readings taken in circuit"

Thanks in advance

Title: Re: Sony KDL32U3000--PSU A1276-472A...Dead/No standby Light
Post by: E Parton on December 17, 2011,13:30:16

Hi Scoob ...the only way to be absolutely sure is to pop the suspect ..and a good opto off the board ..re -read and compare ..
..and yes a faulty opto could stop a psu starting up ...they can also be responsible for total destruction of the silicon etc.. in a psu ..if they go faulty ..so check other components in the primary of the psu ..._if_ its found to be faulty..
good luck m8
Evan

Title: Re: Sony KDL32U3000--PSU A1276-472A...Dead/No standby Light
Post by: scooby-doo on December 17, 2011,14:44:05

Thanks Evan....All readings are ok out of circuit mate.

To be honest I have just seen a used psu on Flebay for £14 so I think the quickest and easiest option is to replace.

But thanks again

Title: Re: Sony KDL32U3000--PSU A1276-472A...Dead/No standby Light
Post by: krl on December 23, 2011,10:26:22

Hi. Usual cause is D6206,D6202 or D6207 reverse leakage. Good Luck

Title: Re: Sony KDL32U3000--PSU A1276-472A...Dead/No standby Light
Post by: scooby-doo on December 23, 2011,11:38:27

Cheers krl

Got the PSU yesterday and its all fine now...will check the components you mentioned, then hopefully have a spare board

Thanks again