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Equipment Repairs => LCD TV forum => Topic started by: michael h on April 03, 2016,12:48:21

Title: sony kdl20s3000 dead
Post by: michael h on April 03, 2016,12:48:21

anyone know why this TV just wont switch on anymore,  not even a standby light

Title: Re: sony kdl20s3000 dead
Post by: downunder on April 03, 2016,20:04:51

Hi Michael,

You haven't given us much to go on. Have you done any troubleshooting or measured voltages?

Let's start with the power supply. At connector CN3 you must have:
PIN 13 : 3.4V Standby at all times the tv is plugged in.
PIN 11 : Approx 2.5V PWR-ON when you attempt to switch the tv on. This is supplied by the main board to turn the bulk of the PSU voltages on.
PIN 10 : Approx 3V AC-OF DET. This should appear when the PSU fires on. If it is missing, the tv will not power up.

See how you go with these for starters. If the 3.4V Standby is zero, check 10 ohm fusible R6200 (usually white). Make sure you discharge the main ripple filter
(the large 450V one) first, or you might end up with a duff meter as well.

If R6200 is indeed o/c, you'll find that the 5V switching IC IC6200 (MIP2H2) is gone as well.

Bruce

Title: Re: sony kdl20s3000 dead
Post by: jordan on April 04, 2016,08:16:20

Check also IC (MZC3001) for being temperature sensitive

Title: Re: sony kdl20s3000 dead
Post by: downunder on April 05, 2016,04:07:14

Hi Jordan,

MCZ3001? Are you sure you haven't got your wires crossed? I haven't seen this chip used since Sony's failed experiment using them in CRT sets.

I can't find it in the KDL-20S300 parts list. Tell me I'm not going nuts.                    Bruce

Title: Re: sony kdl20s3000 dead
Post by: jordan on April 05, 2016,04:41:39

Weiw PSU diagram...IC-6000

Title: Re: sony kdl20s3000 dead
Post by: downunder on April 05, 2016,06:22:59

Not convinced, Jordan. The KDL-26S3000 is a WAX3 chassis.

Title: Re: sony kdl20s3000 dead
Post by: jordan on April 05, 2016,08:03:59

http://www.service-manual.net/ashop/Sony-Service-Manual-Downloads-All-Models.html