Mulja tv repair portal

Equipment Repairs => CRT TV forum => Topic started by: t1412 on June 12, 2010,10:15:56

Title: hitachi C28WF54ON
Post by: t1412 on June 12, 2010,10:15:56

OK CHAP'S GOT THIS TV IN IT'S HITACHI CRT  MODEL NUMBER C28WF54ON 11AK33J4 CHASSIS. THE OUTPUT TRANSISTOR AS GONE BU2508AF . THE QUESTION I'M ASKING CAN I USE BU2525AF AS THIS THE ONLY THINK THATS AROUND ME AT THE MINUTE THANKS

REGARDS
SHAUN   

Title: Re: hitachi C28WF54ON
Post by: daz on June 13, 2010,04:49:10

hi shaun
it should work ok, dont forget to check caps around it and have a good look for dry joints
good luck
daz

Title: Re: hitachi C28WF54ON
Post by: t1412 on June 13, 2010,05:39:44

OK DAZ THANKS I REPLACED IT WITH THE BU2525AF BUT IT BLEW IT AGAIN JUST GOT A BUZZING SOUND WHEN YOU SWITCH IT ON ANY IDEAS
CHEERS
SHAUN

Title: Re: hitachi C28WF54ON
Post by: brainstorm on June 13, 2010,06:18:46

Hi Shaun,

This set is fitted with a Vestel Chassis(11AK33) and C612 and C611 are listed as potential causes of Line Transister failure also L601

Regards
Brian

Title: Re: hitachi C28WF54ON
Post by: t1412 on June 13, 2010,09:21:41

thanks brainstomer i'll do the checks and get back to you  cheers
shaun
 

Title: Re: hitachi C28WF54ON
Post by: Contrast John on June 20, 2010,14:31:07

Hi Guys
Got caught out a couple of years ago with a Vestel AK19 chassis. After resoldering the usual 1001 dry joints and replacing the blown line transistor (BU2508AF) with a seemingly better rated BU2525AF, I had an immediate recall. Blown line transistor again. Fitted another and it survived 3 startups before it died again. Back at the workshop a thorough investigation found no other problems and another BU2525 was fitted. Started ok and was left running a couple of hours with no problem. Put it into standby and brought it out again-and goodbye line transistor. Time to raid a scrap chassis and fit a BU2508AF. Problem solved. According to the blurb I could find at the time the BU2508AF has a higher tolerance to base drive variations (whatever that was supposed to mean). Guess there's more to these line transistors than just the current and voltage specs! Dont know if its the answer this time but certainly worthy of consideration.
Regards
John.

Title: Re: hitachi C28WF54ON
Post by: t1412 on June 20, 2010,17:38:58

ok john thanks for interest i replaced the transistor put a bu2525af but it blew again there was a bit of smoke come from flyback transformer  cheer's ps a good replacements s2000 bu2520af

regards
shaun