Sony KDL50EX645

[ljintexas]

Been running this set for a few days since i got the repaired smps back from Sony Serv Center. Was working perfectly. Dead totally. No green LED, No Red LED. Nothing. Not getting PS-ON 3.3 volts from main board. Disc main board and jump pins 1-3 on smps. 12 and 24 volt rails come up.Have 3.3 volts standby on pins 1 and 2. Main board Digital audio port glowing red. I cannot find a service manual for this set anywhere.
It did have access to internet while it was running.

[ammarben]

Re: Sony KDL50EX645

check main bord volage regulators

[ljintexas]

Re: Sony KDL50EX645

I see two of them that look identical. They do not read the same when tested with meter.

[ljintexas]

Re: Sony KDL50EX645

They are smd..to take them out of circuit can i use a normal iron?

[tibimakai]

Re: Sony KDL50EX645

Put a blob of solder(join all of them), on the legs and heat them up all at once. Go back an forth on the tab and legs.

[Agent24]

Re: Sony KDL50EX645

I see two of them that look identical. They do not read the same when tested with meter.

Are they identical? Exact same part number? Check they are not being used as adjustable regulators.

Photos would help!

[budm]

Re: Sony KDL50EX645

Before taking them out you should at least take the DCV readings of all 3 pins with ref to the chassis GND first, and also provide the P/N as printed on the bodies.

[ljintexas]

Re: Sony KDL50EX645

The new board from SJ arrived...the resistance readings on both voltage regulators varies greatly bwtween the old board and the new board

[Andrew F. Ali]

Re: Sony KDL50EX645

Did the new board work? SJ is about the best place to get replacements...

[ljintexas]

Re: Sony KDL50EX645

Yes, the main board did restore operation.