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Equipment Repairs => CRT TV forum => Topic started by: Turnip on August 05, 2009,08:57:06

Title: JVC AV32T25EKS JL Chassis - Field fault
Post by: Turnip on August 05, 2009,08:57:06

Hi Folks,

   Have one of these where after being initially near OK, Field height expands considerably with large black bar at top. Fault isn't heat, cooling or vibration sensitive.

   Any thoughts - Chris.

Title: Re: JVC AV32T25EKS JL Chassis - Field fault
Post by: Contrast John on August 09, 2009,11:34:30

Hi Chris
Had a similar frame fault with a JVC AV-28R370 (JL2 Chassis). Started with top half of scan and gradually increased to around three-quarter scan. After a long battle replacing just about everything in the V out stage, I traced the V drive back and found it was supplied via a smd IC whose function is to shape the V drive waveform. This IC was faulty. Circuit ref IC 501 type AN5441 SA-W. Obtained a replacement from CHS. Might be worth a swop if your chassis uses this IC.

Regards
John.

Title: Re: JVC AV32T25EKS JL Chassis - Field fault
Post by: Turnip on August 09, 2009,12:20:10

Thanks, John.

   Would have initially changed the FO/P, but didn't have any, so thought to try Quuq. Now, off to Wiltsgrove for a replacement. Have just checked shematic and found no IC501, so will initially go for the Fo/p

  Thanks - Chris, will be back if it doesn't do the biz.

Title: Re: JVC AV32T25EKS JL Chassis - Field fault
Post by: veromade on August 19, 2009,22:10:27

really thanks for your information