Riddled TV Repair Forum

iphixrex · Joined: 19 Nov 2010 Posts: 2

I'd just like to start by saying how impressed I am with this forum. The information and helpfulness reminds me very much of the automobile forum I am a part of.

Yesterday I picked up a nice 32" Sony CRT off Craiglist for free. I've gone from chipping and tuning ecu's to repairing PS3's, so I figured I'd play around and see what I could do with a non-working TV. All of the information I've gathered from drudging the trenches of the internet pertains to other models with slightly different chip boards and the blinking trouble code guides dont quite describe my issue.

It's a Sony KV-32FS17 and will not power on. After pressing the power button a relay clicks, you can hear a high pitch whining, and the red LED will do 2 short blinks, 1 long, then 1 short. Unfortunately unlike a Honda computer, there is no information pertaining to lengths of blinks, there is just a number count. So from what I've found, 4 blinks determines:

-"No vertical Deflection (V STOP), Screen goes to a single horizontal line then the video signal muted. Check IC1509, Q1505" -non model specific info

-or the same issue on another model with the problem being IC702.

...only there is no single horizontal line, no IC1509, no Q1505, no IC702, no video, no audio. It very well may be a bad IC chip or Transistor or combination of both. I did find IC502 on the A board with "Vertical Def" labeled near it. I just don't know where to start testing or how to test a 7 leg transistor like the IC502.

Any help would be greatly appreciated! I look forward to enjoying my near free tv!

Google

JTS1957 · Joined: 21 Jan 2009 Posts: 2395 Location: Far, Far Away

I had no problems.

Did you click on: "SONY service manual KV-32FS17 repair manual" to proceed to the next screen and then fill in the Captcha and enter it?

Alternate source, but my not be full manual: http://elektrotanya.com/?q=showresult&megnev=&megnev2=KV-32FS17&kategoria=&kat2=all

iphixrex · Joined: 19 Nov 2010 Posts: 2

I came across a good 4 blink article which guided me to transistor Q502. I found a dry solder on it and on transformer T501. I resoldered Q502 and T501 and that solved my short/long blinking light issue, just a solid 4 blink cycle now. Next I pulled Q502 for continuity testing.

From what I understand, a good transistor should have a short between B-E, but not between B-C or E-C.

Strangely I get resistance between all three points.

B-E = 1.1
B-C = 1.1
E-C = 0.9

I'm assuming the transistor is bad. The Q502 part number is D2580. Surely I can find them online, but I'm eager to get this baby up and running.

Are these available at Radio Shack, or maybe a local electronics supplier?

Are there compatable part numbers from different suppliers?

JTS1957 · Joined: 21 Jan 2009 Posts: 2395 Location: Far, Far Away

http://electronics.mcmelectronics.com/?N=&Ntt=2sd2580&x=0&y=0

Get a spare, although bad driver joints will take one out, but you've corrected that. B-E will read low - NOT zero!