I have a 1998 TV, JVC 27" MODEL AV-27920
Set stby light blinksafter set is plug in. I can hear power supply trying to startup when power pressbut just shut down.
any help on this guys?

Check the HOT and FBT.

both hot and flyback seem to be fine everything looks ok but stby only flashes

You can check right away if HOT is busted.How do you know if the FBT is good or not ? Tell us please.....

The sears model number is 509.14370 or 27" JVC tv model:AV-27920/AV27820/AV27320,chassis:A67,year:Aug 98,SAMS 4080,a common failure is over time the picture shrinks to a point where you no longer have vertical deflection then the tv shuts off and when turned on the tv stays on for a few seconds,here are the common failure parts:

http://www.iwaynet.net/~nesda/Aug05/Aug054.html

IC1421=LA7832=JVC # LA7832=Panasonic # LA7832=you can sub with LA7833
R1541=1.8 ohm,2W (metal fuseable)=JVC # QRT029J-1R8=NTE # F2W1D8=ECG # FPR-TP18C=Memorex (Orion) # R6558A1R8J
D1541=RGPJ-T3=RGP10J-5025-T3=ECG/NTE 506=RCA # SK3998
D1422=MTZJ75-T2=1N4761A=75V zener diode,0.3W=ECG/NTE5046A=Sharp # RH-EX0238CEZZ
C1424=100 Uf,35V
C1425=470 Uf,35V
C1427=2200 Uf,25V

D1421=1N4003-T2
R1422=1.8 Ohm, 2watt=JVC # QRT029J-1R8
R1542=JVC # QRL029J-101
R1582=JVC # QRL029J-223
D1541=JVC # RGP10J-5025-T3

T502=flyback
JVC # QQH0028-001
JVC # FSM27A001
HR Diemen # HR 8511

JVC usually uses the generic # for their own part #'s so does Panasonic.

Sidney
Dartmouth,Nova Scotia
Canada

Free service manual downloads:

http://www.schematicsforfree.com/archive/file/Video/Products/Jvc_av-27820_tv.pdf

http://www.schematicsforfree.com
http://www.schematicsforfree.mattsoft.net
http://schematicsforfree.mattsoft.net
http://schforfree.seedhost.com
http://www.epanorama.net/schematicsforfree

then click on "click here to see the files" followe by "video" followed by "products".

Am I the best or what?.

Sidney
Dartmouth,Nova Scotia
Canada