Soniq (australian brand) 32" - screen doesn't always start up

[psmedley]

Hi All,

I will try add photos tonight or tomorrow, but I have a Soniq 32" plasma TV that will not always start up.

By that I mean the power light changes from red to blue when the remote is turned on, but the screen doesn't always come on. Probably 1/3 chance. If it doesn't, power needs to be removed from the AC for 30 seconds or so before I can try again - it will usually work the second or third attempt.

A number of capacitors were replaced on this TV 18 months ago by a repair shop, but the price of new TV's has dropped so much my mother in law decided on a new set, so I'm trying to repair this one .

I did notice one leaking cap on the power supply board and replaced it which hasn't really helped.

Given the symptoms, is this likely to be a power issue?

Panel itself is LG, as is the YSUS and ZSUS boards (EAX36466502 and EAX36466601 respectively).

PSU is a Liteon model.

[retiredcaps]

Re: Soniq (australian brand) 32" - screen doesn't always start up

A number of capacitors were replaced on this TV 18 months ago by a repair shop, but the price of new TV's has dropped so much my mother in law decided on a new set, so I'm trying to repair this one .

I did notice one leaking cap on the power supply board and replaced it which hasn't really helped.

If the repair shop replaced the capacitors with general purpose capacitors instead of quality brand low ESR capacitors, I'm not surprised if the capacitors died again in 18 months.

See my standard answer regarding capacitors at (regulars may skip)

https://www.badcaps.net/forum/showpo...84&postcount=3

[psmedley]

Re: Soniq (australian brand) 32" - screen doesn't always start up

Just took some photos - too early to get direct sunlight so tried under an interior light in macro mode and they came out all blurry.

Will try again when I get home from work.

PSU caps look to be Samwha and Jamicon. I think the Jamicon are the ones that were replaced last year as there's only a handful of those.

[retiredcaps]

Re: Soniq (australian brand) 32" - screen doesn't always start up

I think the Jamicon are the ones that were replaced last year as there's only a handful of those.

The series id what is important. For example, Panasonic makes a lot of different caps for different applications. Panasonic series FR, FM, and FC are the only low ESR capacitors that are available to the consumer for purchase.

[pfrcom]

Re: Soniq (australian brand) 32" - screen doesn't always start up

I think Soniq is JB HiFi's house brand, no doubt built (down) to a price

[psmedley]

Re: Soniq (australian brand) 32" - screen doesn't always start up

The series id what is important. For example, Panasonic makes a lot of different caps for different applications. Panasonic series FR, FM, and FC are the only low ESR capacitors that are available to the consumer for purchase.

The Samwha I replaced on the PSU board that is obviously defective has the following details on it: 24V 470uF 105C, WB series

The Jamicon caps are: 2200 uF, 25V 105C TK series

[psmedley]

Re: Soniq (australian brand) 32" - screen doesn't always start up

Photos attached - got home late so was unable to get pictures with natural light

[psmedley]

Re: Soniq (australian brand) 32" - screen doesn't always start up

Is the advice to start with replacing just the caps on the PSU board based on the symptoms I'm experiencing?

Just catalogued all the caps on this board, they are as follows:
1 x 50V 10uF Samwha WL
1 x 50V 22uF Samwha WL
2 x 25V 47uF Samwha RD
2 x 50V 47uF Samwha WL
1 x 63V 47uF Samwha WB
3 x 10V 100uF Samwha WL
2 x 250V 220uF Samwha PT
1 x 10V 470uF Samwha RD
1 x 25V 470uF Samwha WB
1 x 50V 470uF Samwha WB
1 x 100V 470uF Samwha PT
2 x 25V 2200uF Jamicon TK **previously replaced

[selldoor]

Re: Soniq (australian brand) 32" - screen doesn't always start up

Hi - pictures could be a bit sharper as you say good lighting is the key also if you can get them as near to 2 mb as possible so they will enlarge. Before you start replacing can you take close up pics of the connectors showing the legends beside them. Voltages can then be checked - it may not be the power supply - what are the caps on the board in the third picture - inverter? - do they look good? What is the board number? can you do better pictures of it top down and a close up of the connectors and the top left corner would be good - is that a regulator?


Perhaps ,while you wait for the N American Continent to come on, you can start listing
your caps - it can take some time and you can then start looking around for replacements.

[psmedley]

Re: Soniq (australian brand) 32" - screen doesn't always start up

Will try get some better pictures tomorrow - assuming I get home from work a little earlier :/

3rd pic is the ysys board p/n is in 1st post

[psmedley]

Re: Soniq (australian brand) 32" - screen doesn't always start up

Before you start replacing can you take close up pics of the connectors showing the legends beside them. Voltages can then be checked - it may not be the power supply

on PSU board, top left connector legend is:
AC DET
RL_ON
VS_ON
5V MNT
M5 V_ON
GND
GND
16V
16V
GND
9VSC
GND
5VSC
STBY 5V
GND

Connector on top RH side is:
5V-
GND
VA
GND
GND
GND
NC
VS-

[cashkennedy]

Re: Soniq (australian brand) 32" - screen doesn't always start up

with the tv off test the stby 5v for dc voltage (black probe on a screw holding a board in, or a metal peice of the frame, and red probe on the wire your testing).

with it on (and in the error state where screen isnt on) test the 16v and other 5v's.

Report back on those.

[psmedley]

Re: Soniq (australian brand) 32" - screen doesn't always start up

For some reason, I couldn't get the tv to fail tonight until just before I had to quit for the night. Will try again tomorrow.

[psmedley]

Re: Soniq (australian brand) 32" - screen doesn't always start up

with the tv off test the stby 5v for dc voltage (black probe on a screw holding a board in, or a metal peice of the frame, and red probe on the wire your testing).

with it on (and in the error state where screen isnt on) test the 16v and other 5v's.

Report back on those.

TV Off - Stby = 5v

With it on: 16v = 16.51v, 5V = 4.95 whether in the error state or working normally, so seems the PSU is ok?

Does this then suggest a problem with the input board? - ie the one with all the inputs/tuner on it?

This one has capacitors denoted JAYE - I replaced one that was very slightly bulged - the others 'appear' OK.

[selldoor]

Re: Soniq (australian brand) 32" - screen doesn't always start up

We really need the better pictures and close up of the caps dont recall seeing JAYE on anything. I am assuming that it did go back into fail. Nexy easy thing to try would be to gently heat different parts of the boards with a hairdryer for 2 -3 minutes when in the failed state but still on, to see if it starts up. If that doesnt work then switch off re heat part of a board and re-try. We are looking for either a cap that is failing but when heated works a bit better or a solder joint that has cracked but rejoins when it expands on heating. Its a bit laborious but lot easier than resoldering every joint or replacing every cap. Do not overheat any part.

[psmedley]

Re: Soniq (australian brand) 32" - screen doesn't always start up

Thanks selldoor - will try for better photos on the weekend when I'm home during the day. Days are getting shorted here in Adelaide and I keep getting home late from work :/ Appreciate the input!

[psmedley]

Re: Soniq (australian brand) 32" - screen doesn't always start up

OK, dragged the TV downstairs and got some photos in better light that are hopefully a lot clearer

[cashkennedy]

Re: Soniq (australian brand) 32" - screen doesn't always start up

I dont have any experience with plasmas, but theres always a higher voltage from the PSU then just 16v, I think the VS- is one of the higher ones you want to measure. I think its ~ 60v on some plasmas.

Hopefully someone here can sugest what other voltages to test besides for just the low 16v and 5v that pretty much only power the IC's / mainboard.

But you should be safe to test all the small wires that are grouped together with the 16v and 5v's with your mulimeter on 500-700v (whatever the max is)

[tom66]

Re: Soniq (australian brand) 32" - screen doesn't always start up

Can you check the AC_DET pin during when it fails to turn on, and when it works?

Plasma displays use four or five different voltages. The two most important are Vs and Va, approximately 180-210V and 50-70V. In addition, there are -Vy, around 120-200V, Vzbias, around 60-90V, and Vscw, around 180-200V.

[psmedley]

Re: Soniq (australian brand) 32" - screen doesn't always start up

VA is 62.4 in both scenarios, VS is 189.5 - also in both scenarios, will go look for AC_DET pin now