Sony KD-34XBR960 (DA-4 chassis) 7 blinks no HV...Help me understand!

[vol.2]

There's a chart on the righthand side of page 123 that lists every single pin of every IC on the board containing IC8001 and what should be present on the pin. There's lines in red on the schematic detailing important voltages to check for.

Ctrl+F>IC8001 inside the PDF

[zeno]

For manual
IIRC KV30HS420 was the common model with 2 IC's. Its SAMS 5162.
SAMS KV34..... models are 5429, 5398, 5460. No XBR's listed.
Try running on SAMS the chassis number SCC-### without varieties,
just the chassis family.

Only remember bad IC's & one or two FBT's on these sets. If the blink is for
over current its probably the FBT.
To test start the set a few times & see if the HOT is getting hot !
Another test is unplug the DGS, turn set on, watch the current.
If it goes over 1 amp usually FBT. Normal running current is @.8 amps.
And finally dont forget this has two or three grounds so gotta use the
right ground point for measurements.

73 Zeno
LFOD !

[Electronic M]

Originally Posted by zeno

For manual
IIRC KV30HS420 was the common model with 2 IC's. Its SAMS 5162.
SAMS KV34..... models are 5429, 5398, 5460. No XBR's listed.
Try running on SAMS the chassis number SCC-### without varieties,
just the chassis family.

Only remember bad IC's & one or two FBT's on these sets. If the blink is for
over current its probably the FBT.
To test start the set a few times & see if the HOT is getting hot !
Another test is unplug the DGS, turn set on, watch the current.
If it goes over 1 amp usually FBT. Normal running current is @.8 amps.
And finally dont forget this has two or three grounds so gotta use the
right ground point for measurements.

73 Zeno
LFOD !

I'm going to stick with the factory manual. I don't have any Sam's above 1800 as typically 1970s Zenith Chromacolor II sets are the only solid state sets I'll touch, don't have budget to be buying from Sam's.

I had to turn it on a dozen times (goes into shutdown within 2-3 seconds so measuring 26 pins takes time) to take measurements and the flyback FETs stayed cool.

EDIT: Also looking at the schematic the Horizontal deflection doesn't come from the flyback on the DA-4 sets. The flyback only makes HV. And the horizontal sweep is it's own independent circuit separate from the HV supply for the CRT.....Sort of like a late 1940's electrostatic TV...What's old is new again.

[Electronic M]

Originally Posted by vol.2

There's a chart on the righthand side of page 123 that lists every single pin of every IC on the board containing IC8001 and what should be present on the pin. There's lines in red on the schematic detailing important voltages to check for.

Ctrl+F>IC8001 inside the PDF

IC8002
Pin : Chart : Measures
1 : 2.6V : 0V
2 : 1.8V : 3.8V
3 : 2.2v : 1.7
4 : 2.5v : 2.3
6 : 0.0v : 0
7 : 4.6v : 0.141
8 : 17.9 : 17.6
9 : 0.0v : 0
10 : 10.5 : 10.5
12 : 4.8 : 0
14 : 151.8 : 0.03
15 : 142.2 : 110.6
16 : 146.3 : 133.8
18 : 306.1 : 4.1

IC8001 is a tiny surface mount under the board and is a lot less fun to measure than the through hole dips I've been messing with.
Pin : chart : measures
1 : 0.1v : 0.05
2 : 2.5v : 2.5
3 : 2.1v : 0.2
5 : 2.3v : 0.3
6 : 2.5v : 2.5
7: 0.0 : 0
8 : 17.5 : 17.5

Does this tell you anything as to what's wrong?

I should add that on some power ups it is degaussing.