Riddled TV Repair Forum
Service Menu and Manual Schematics
 
   
 FAQFAQ   SearchSearch   RegisterRegister 
   Log inLog in 
Sony KV-30HS420 won't turn on - 6 blinks    
Post new topic   Reply to topic    Riddled TV Repair Forum Index -> TV Repair
 
Author Message
kuhurdler



Joined: 28 Dec 2006
Posts: 2879
Location: Overland Park, KS

PostPosted: Sat Jan 23, 2010 2:31 pm    Post subject: Sony KV-30HS420 won't turn on - 6 blinks Reply with quote

Set tries to start up. Turns on with audio only, no video for about 5 seconds and then shuts off with 6 LED blinks. repeat attempts are the same result.


Saw something on Justanswer about IC8002 and IC6501 both going bad in the power supply. Part# MCZ3001D (18 pin Pulse Width Modulated Control Circuit).

Can you anyone confirm that 6 blinks is indeed the power supply?


Gracias in Advance,
Jim
Google

PostPost subject: Advertisement

Jesse Mack



Joined: 22 May 2008
Posts: 600
Location: The Last Frontier

PostPosted: Sat Jan 23, 2010 4:18 pm    Post subject: Reply with quote

6 blinks = low B+ 5 Volt line overloaded/shorted/missing

AY/BY/MY boards.
IC504 bad on AY board
AY has the 5 volt standby regulator on it.(IC501)
It also has the 5 volt run supply on it (IC504)

Possibly;
Quote:
Saw something on Justanswer about IC8002 and IC6501 both going bad in the power supply. Part# MCZ3001D (18 pin Pulse Width Modulated Control Circuit).

Check by making sure you have verified 5 Volt run.
This means making sure the unregulated 7 volt supply is active upon turn on which is on the secondary of the IC6501 regulator circuit.

Look for open fusables and expanded caps in this circuit (on the DZ board)

Jesse


Last edited by Jesse Mack on Sat Jan 23, 2010 4:19 pm; edited 1 time in total
JTS1957



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

PostPosted: Sat Jan 23, 2010 4:18 pm    Post subject: Reply with quote

Many of the later model Sony TV's have a built in Self- Diagnosis function. If the
timer/standby indicator is blinking, this could be an indication of the problem with the
unit. The diagnostic blinking will occur automatically with no action required by you to
engage it.
The timing of the blinking you see would be as follows: two to eight blinks (depending on
the fault) about a third of a second apart, then pauses for 3 seconds, then the two to
eight blinks about a third of a second apart again.
Here is a list of the problems that might have occurred indicated by the number of
blinks. The words in parentheses are those which you will see for each of these faults on
a diagnosis screen described later in this article.
Unit is dead and there are no blinks---Problem in the standby power section. Might check
fuse, R607, Q601, IC601, R612 and VDR601 (should show open)
Continuous Blink Once A Second, No Pausing As Discussed Above---
No reply from the jungle IC301 (data bus is busy, shorted to ground or held high), IK
video path is defective.
ONE Blink--- not used for the self-diagnosis
TWO Blinks---B+ over current protection (OCP) , unit goes to the standby mode then
displays the 2 blink fault. Could be a short in the power supply of any of the circuits.
THREE Blinks---B+ over voltage protection (OVP), unit goes to the standby mode then
displays the 3 blink fault. This is also a problem in the power supply circuit, check
T603 and R672.
FOUR Blinks---No Vert. Deflection (V STOP), Screen goes to a single horizontal line
then the video signal muted. Check IC1509, Q1505
FIVE Blinks---AKB circuit (AKB), the timer/standby indicator blinks for about 30 seconds
then goes to the self-diagnosis function. Something is wrong with the video. Check
video out, Q705, 732, 761 and other components on the C board, also check Q218, 219,
220 on the A board. Also unit be in IK blanking, try turning up screen slightly.
SIX Blinks---No Horizontal (H STOP), no raster, goes to the blinking self-diagnosis
function
immediately. Check C515 & 516 and the jungle IC, IC206.
SEVEN Blinks---High voltage shutdown. The high voltage has exceeded 33k and the unit goes
immediately into safety shutdown. Check power supply regulation and horizontal circuits.
EIGHT Blinks---Problem with the audio (AUDIO), unit goes to standby and blinks the
self-diagnosis code. Check IC406 audio amp, PS401 and 402.
Intermittent problems ?? This is a great feature. You can also bring up these fault codes
ON-SCREEN to see a list of the problem numbers with the abbreviation of the problem and
the number of times this problem has occurred. This is slightly different than entering
the service mode. To see the diagnostic screen, Press the following buttons:
Display, Channel, 5, Vol Minus, ( Not plus ) then Power. This brings up a screen with
a list of the problems and number of times they have occurred. Each of the problem
names is abbreviated as, "OCP", "OVP", "V STOP", ETC. We have repeated them in
parentheses
in the text for the "Blinks" described above so you can correlate between the diagnostic
screen and the blink codes.
So, now that you know about these self-diagnostics, how do you use them? Say that you have a set with a black screen. You see that the LED is blinking 4 times....This would
tell you that you have no vertical and that is why the video is muted. If it was
blinking 6 times, you would know that you have a horizontal fault.
It's not a sure cure, but it's a little better than a poke in the eye with a sharp stick.
IMPORTANT: after you repair the unit, PLEASE clear the values on this diagnostic screen.
These codes do not reset themselves after the fault is corrected, so if you don't clear
them, you'll be seeing "old" fault codes the next time you enter this screen.
Clearing is done by going into the service mode ( display, channel, 5, volume plus, then
power ) then press 8 and Enter, which of course returns everything to the factory preset
condition.
Jesse Mack



Joined: 22 May 2008
Posts: 600
Location: The Last Frontier

PostPosted: Sat Jan 23, 2010 4:23 pm    Post subject: Reply with quote

Rechecked with service literature on blinks and Horizontal stop on this chassis = 7 Blinks Question

Also. This model has a history of the MCZ3001D Failing both in the Power supply and the Horizontal section.

How you doing JTS1957, What part of the world does your genius radiat from? I have always been impressed with your level of knowledge.

Jesse
JTS1957



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

PostPosted: Sat Jan 23, 2010 4:49 pm    Post subject: Reply with quote

Just outside of Far Far Away (Chicago).
Google

PostPost subject: Advertisement

kuhurdler



Joined: 28 Dec 2006
Posts: 2879
Location: Overland Park, KS

PostPosted: Sun Jan 24, 2010 7:16 am    Post subject: Reply with quote

Thank you both.
kuhurdler



Joined: 28 Dec 2006
Posts: 2879
Location: Overland Park, KS

PostPosted: Wed Feb 03, 2010 11:13 am    Post subject: Reply with quote

Replacing IC8002 and IC6501 fixed it.
Display posts from previous:   
Post new topic   Reply to topic    Riddled TV Repair Forum Index -> TV Repair All times are GMT - 6 Hours
Page 1 of 1

 


Disclaimer: All information provided by RiddledTV is strictly for information purposes only. Please observe all warnings displayed on your electronic
devices. This information should only be used to help diagnose work, and all service should be performed by a qualified technician.
Privacy Policy       Copyright © 2020 RiddledTV.com       Advertise on RiddedTV.com