goodman gtvl26wbhd power supply wont start

[repair all]

hi got this set wont start up without the aid of an resistor across the 24 volt line (1.5k) .tv will work ok for about 15 minutes.if I swich it on without the resistor it just wont start up there is 16 volts instead of 24 just check the caps and diodes with no joy everything appears to be ok can anybody shine some light on this problem the power supply is sta180tv type made in china

[tom66]

Re: goodman gtvl26wbhd power supply wont start

Is it a Vestel, 17PWxx power supply? It is a common problem with Vestel TVs.

[repair all]

Re: goodman gtvl26wbhd power supply wont start

no the power supply does not seem to be the types you mention I have look on the net for information and could only get that they are made in china no circuit diagram at all the part number is 536t-0901800-00 and underneat this sta180tv

[tom66]

Re: goodman gtvl26wbhd power supply wont start

Post a picture. Someone may recognise it.

[repair all]

Re: goodman gtvl26wbhd power supply wont start

sorry about the delay on picture

[tom66]

Re: goodman gtvl26wbhd power supply wont start

If possible, post a bigger picture - this website supports up to 2000x2000.

Also, is the heatsink (metal plate) removable, so you can check underneath it?

[selldoor]

Re: goodman gtvl26wbhd power supply wont start

I guess it will look like this underneath the top plate so not going to be easy to work on..:http://obrazki.elektroda.pl/3014491300_1319657852.jpg.

Can you post a picture of the bottom of the board as well as the top inside of yours?

When you say you checked the caps is that with an ESR meter

[repair all]

Re: goodman gtvl26wbhd power supply wont start

the underneath the heatsink is right took out the one with the 5 transistors on it too check the caps check with an capicator tester I have notice that when the tv turns off 10-15 min the caps are warm

[repair all]

Re: goodman gtvl26wbhd power supply wont start

if possible, post a bigger picture - this website supports up to 2000x2000.

Also, is the heatsink (metal plate) removable, so you can check underneath it?

[tom66]

Re: goodman gtvl26wbhd power supply wont start

Warm caps are generally a sign of increasing ESR, but not always.

What you can try to do is get out a hairdryer and start heating parts of the TV until it cuts out. If it cuts out when you heat an area, turn it off, let it cool down and heat that area up immediately after power up and see if it cuts out immediately.

This will locate the thermally sensitive part(s).

[repair all]

Re: goodman gtvl26wbhd power supply wont start

I will try that later on and let you know what happens

[selldoor]

Re: goodman gtvl26wbhd power supply wont start

Hi - The pictures are not good enough- we need to be able to read the
board designations and look for faults- they should look like this:
https://www.badcaps.net/forum/attach...1&d=1290283049

[repair all]

Re: goodman gtvl26wbhd power supply wont start

sorry again about picture. will have to get better unit to take them.anyway sort the problem out yesterday it was c56 a 2200uf 10volts cap. I had tv on for about 4 hours soak test no problems what so ever.would like to get a schematic of the power supply just for referance in case anything goes wrong.will send you picture off the power supply in near future.