Technika 22-880 startup issues

[notallbad]

The tv sometimes turns on but always with 15 front panel flashes and when switched to standby with 7, sometimes 10 flashes.

When the tv is on it works perfectly well.

PS b/d : 17PW05-3 V.2 170111

Main A/V b/d : 17MB60-3.1

On the PS b/d on the connector next to PL706 when the tv is on and 'working' (numbered from top to bottom):
1 - 22.3V
2 - 22.3V
3 - 3.06V
4 - 2.18V
5 - 0
6 - 0
Looks like this is for the inverter, must be 1) & 2) for 24v rails for backlights, 3) BLOn, 4) Dim, 5) & 6) Gnd

On the PS b/d on the connector next to PL703 when the tv is on and 'working' (numbered from top to bottom):
1 - 3.3v (tv in stby reads 5v)
2 - 3.3v
3 - 3.3v
4 - 11.12v
5 - 5v
6 - 4.97v
7 - 2.23v
8 - 3.12v (tv in stby reads 0v)
9 - 0.02v (tv in stby reads 3v)
10 - 0v

Can't access the other pins currently to take measurements.

This tv does not have a keypad so only operates from a remote which luckily I do have for this one!

Are there known issues with this Vestel based PS or main A/V b/d? I am aware that these Vestels are known to have issues.

[notallbad]

Re: Technika 22-880 startup issues

Just realised the wrong photos have been added. To follow.

In standby

1 - 18.16v
2 - 18.16v
3 - 0.3v
4 - 0v
5 - 0v
6 - 0v

Why would there be 18.16v on the 24v rails still when in standby?

For reference the panel in this one is an LG, can't see a model no. without further disassembly.

[notallbad]

Re: Technika 22-880 startup issues

Board photos

[notallbad]

Re: Technika 22-880 startup issues

Hi Guys back with this one!

Seems that everything works fine, USB port, HDMI ports, Scart, Vga In, DVB Tuner, volume etc.. etc......

PS b/d voltages seem to be alright so decided to look at the Service Menu and found a Diagnostic page though most options are locked(Read-Only),

HDMI I2C says NOK
Ethernet says NOK
CL+ Credidentals says NOK

After doing a Factory Reset the following item was added to the above list, before it said OK.

IF I2C says NOK

I don't think Ethernet and CL+ are of concern as the Tv has no Ethernet port and the CL+ has no purpose here in the UK, not as far as I know.

Strange that everything seems to be working including the HDMI and Tuner yet the I2C's are showing errors.

When the tv is powered up into Stby the front LED flashes 14 times then flashes again when brought out of standby 13 times, this does change.

The fault almost certainly is on the A/V b/d, but not sure what to look for here.

Another strange thing is Hotel Mode is set to Yes and yet it can't be as all functions(keypad and remote) and inputs are working, odd!

I guess I could update the FW currently V.0.6.9s but don't think that will be of any benefit here.

[notallbad]

Re: Technika 22-880 startup issues

Voltage readings from PL703 in Stby and when On

1 0.29v 3.3v---------11 0.3v 4.99v
2 0.29v 3.3v---------12 0.3v 4.99v
3 0.29v 3.3v---------13 0.3v 4.99v
4 8.62v 11.11v-------14 8.66v 11.11v
5 0.25v 5v-----------15 0.26v 5v
6 4.84v 4.94v--------16 4.86v 11.05v
7 0v 2.22v ----------17 0v 0v
8 0.29v 3.11v--------18 0.3v 0v
9 2.97v 0v-----------19 2.98v 0v
10 0v 0v-------------20 0v 0v

[notallbad]

Re: Technika 22-880 startup issues

Reading another thread working on a similar Vestel board I looked at the regulators and found 8v (Pin 3, tab up pin on the right)on the one near that C1083 which was found to be the fault but is 8v to be expected?
Tab up, Pin 1 and 2 (left and middle) reads 1.21v across them, slightly lower than to be expected but would think that is within tolerance, or not???

[notallbad]

Re: Technika 22-880 startup issues

Looking at the service manual for a similar vestel it would appear 8v is fine so too is the 1.2v across pin 1 & 2.

How do I test the PS stand alone?

[notallbad]

Re: Technika 22-880 startup issues

I'm getting the feeling people are ignoring this thread, perhaps the slightist mention of 'Vestel' is steering people away.

[tom66]

Re: Technika 22-880 startup issues

Or we don't have anything useful to contribute. Some problems are difficult to fix. Vestels are often the easiest though because so many people tend to share similar issues.

[notallbad]

Re: Technika 22-880 startup issues

Main A/V b/d : 17MB60-3.1

[notallbad]

Re: Technika 22-880 startup issues

Thanks Tom
Could you tell me how to run the PS standalone please.

I don't think I have numbered the pins correctly, see above Post #5, but would a 1k ohm resistor between pins 5 and 6 start it up?
Thanks

[notallbad]

Re: Technika 22-880 startup issues

In standby theres a buzzing diode D704 next to the transformer, could this be the fault? Or the 2kv cap or the ICE perhaps?

What is this part of the circuit, rectification?

How can I test for voltages here, where to probe and what readings should I expect? Thanks

[tom66]

Re: Technika 22-880 startup issues

P/S schematic


I'd say pin 17 and pin 9 thru 1k.

[notallbad]

Re: Technika 22-880 startup issues

Cheers Tom
That schema helps so I shall renumber those pins to associate the correct voltages.

[notallbad]

Re: Technika 22-880 startup issues

PS b/d PL703:
1. 0.29v 3.3v---------2. 0.3v 4.99v
3. 0.29v 3.3v---------4. 0.3v 4.99v
5. 0.29v 3.3v---------6. 0.3v 4.99v
7. 8.62v 11.11v-------8. 8.66v 11.11v
9. 0.25v 5v-----------10. 0.26v 5v
11. 4.84v 4.94v--------12. 4.86v 11.05v
13. 0v 2.22v ----------14. 0v 0v
15. 0.29v 3.11v--------16. 0.3v 0v
17. 2.97v 0v-----------18. 2.98v 0v
19. 0v 0v-------------20. 0v 0v

I understand why you don't like Vestel Schemas now!

The only thing I would say that looks odd with these voltages is on Pins 7, 8 & 12 and thats the 12v looks a little low 11.11v and 11.05v.

Also as a note on IC701 theres only 7.68v on Pin 1 and 6.64v on Pin 2 in stby. 10v and 9v respectively when switched on.

12v and 24v are low on TR700 output side 11.14v and 22.3v.

[tom66]

Re: Technika 22-880 startup issues

Two readings for each? Which is which?

[notallbad]

Re: Technika 22-880 startup issues

Pins 1 to 20 - 1st is in stby, second is when on.

[notallbad]

Re: Technika 22-880 startup issues

The front led starts flashing before the buzz, the buzz starts once the front led stops flashing, so think I'm on a wild goose chase with the diode and ICE, maybe. This leads me to believe its something else detected as being at fault. I have replaced D704 with same results and C715.

[notallbad]

Re: Technika 22-880 startup issues

C705 and C706 reads 319v whilst led flashing then rises to 323v when led stops flashing. Turn on from stby and they drop back to 319v then when the tv comes on they drop further to 314v.

Not sure if this helps at all!

[notallbad]

Re: Technika 22-880 startup issues

OK, so it could be the ICE, just read what it is and what it does not that I fully understand it but looks more like its the 12v being too low, I think?