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Equipment Repairs => CRT TV forum => Topic started by: brian on October 16, 2008,04:53:11

Title: Toshiba 32YT56 uses vestel 11AK49-7 chassis.
Post by: brian on October 16, 2008,04:53:11

Hi,
Fault is, stuck in standby,When switching on relay clicks then reverts back to standby,According to Toshiba,D617 line supply diode likely to be short circuit. But I can find no reference of this diode either on the circuit diagram or on the chassis. Can any one HELP!!
Thanks again
Bri.

Title: Re: Toshiba 32YT56 uses vestel 11AK49-7 chassis.
Post by: brainstorm on October 16, 2008,13:27:36

Hi, I think your info from Toshiba is a mis-print and should read D817!(DIODE UF5408)which is the Line supply diode(which I presume means HT supply to Line stage)

Look for problems on Primary side of PSU, including dry joints around Q801, D810. Secondary side, C845 may be bulging, IC800 and IC801 may also need replacing. The fault may cause R804 or R856 to show signs of overheating.

This diode has been upgraded from 800v to 1000volt

The new part number is V30034072
DIODE UF5408

Hope this helps

Title: Re: Toshiba 32YT56 uses vestel 11AK49-7 chassis.
Post by: brian on October 21, 2008,08:00:17

Hello,
Thank ,s Brainstorm, Checked as you advised, All o.k.(just my luck)
Anyway, on further investigation found Q609 BC858B surface mount
to be leaky across b/e junction.
thanks again,
Bri.

Title: Re: Toshiba 32YT56 uses vestel 11AK49-7 chassis.
Post by: floapa311 on October 27, 2008,06:52:16

Quote from: brian on October 16, 2008,04:53:11

Hi,
Fault is, stuck in standby,When switching on relay clicks then reverts back to standby,According to Toshiba,D617 line supply diode likely to be short circuit. But I can find no reference of this diode either on the circuit diagram or on the chassis. Can any one HELP!!
Thanks again
Bri.

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