Sony KV2150R help please with repairing this set.

Eduardo O · Guest

The Stand by/timer LED keeps blinking all time, I have changed the full block of power supply from the
KV20V50 that have the same cables and all, and it did not work, (remains the same) I changed the board
from the back of the TRC and nothing. I tryed changing the TRC and still nothing. (always changing parts from
the KV20V50.
The Horiz. TR is OK. The three canions are On, and therefore there is high Voltage too, (the screen remain
almost dark but from time to time there are white blinks. Also it can feels the Static charge of the TRC on
the screen). I have changed the IC301 (CXA1465AS), the brown Module H-protection (PM-35), I have changed the
fly-back, and the IC102 (24C02AB1 8pin DIP) and nothing seems to work...
Sound is OK. I can tune any chanel.
Hope someone gently can help me. Thank you.

Fredy · Guest

Hello from Colombia.
Visit:http://www.videotech.org/sony.htm
In this place there is a lot of informtation about Sony

Guest

plamensl · Site Admin Joined: 14 May 2004 Posts: 115

To Fredy
The web site is not functioning since 2003 ?

alltronix · Joined: 14 Mar 2005 Posts: 25 Location: Lincoln Nebraska

Test your CRT for weak emision. If weak the video is blanked out. They can be restored with a sencore tester and will usually last a year or so.

datasheet · Guest

http://www.datasheet4u.com

http://nl.datasheet4u.com

Doug KV-27S10 · Guest

I’m too am able to tune in stations with sound but no picture. I have HV and the filaments are glowing in the picture tube. Found a place on the web http://www.circuitwork.com/techassist/tip/SONY1.HTML
For Sony repair tips. I see for my model (KV-27S10) it says to replace IC301 along with a mod by adding a 10volt zener diode on pin 37 and ground. I see you've replaced this very IC chip with out any progress. I thought I might still give it a shot and replace it being we have different models. But I’m just checking to see if you might have found a fix since your last post.

Doug

Guest · Posted: Fri Jan 20, 2006 10:18 am Post subject: Re: Same problem with KV-27S10

I found the culprit on my KV-27S10... I saw tons of other common poblems on message boards but nothing on this resistor being a high failure part. I found this on my own. It was an open resistor on the CRT board... R701 680K 1/2 W Not sure if it will be the same location on your KV20V50. Interesting enough your IC301 (CXA1465AS) is the same board location and chip as mine. While I had the set open I did a few modification that was sugested on this site

http://www.circuitwork.com/techassist/tip/SONY1.HTMLI

* IMPROVEMENT OF POWER SUPPLY CIRCUIT:
REPLACE JUMPERS LOCATED AT R603 WITH A 1 @ 10w RESISTOR (P/N# 1-205-998-11)

*NO PICTURE DUE TO FAILURE OF IC301:
CHECK/REPLACE IC301 AND ADD D308 (P/N# 8-719-110-17) 10v ZENER - CATHODE TO IC301 PIN #37 AND ANODE TO GROUND

Hope this helps...

Doug