Philips 40PFL3008T stopped working

[vinceroger69]

Re: Philips 40PFL3008T stopped working

if the diode is removed from the board for testing and it then beeps when tested both ways yes its usually short circuit and is bad and needs changing

[budm]

Re: Philips 40PFL3008T stopped working

but since that one resistor beeps when disconnected to board and no matter which way I put prongs, that one is clearly faulty?'
You need to use your meter in Ohm mode for checking for resistance, not continuity beep mode. Most meter will beep with up 50 Ohms or so, some may be even higher, all it does is telling you that you have connection from point A to point B through what ever resistance (up to the resistance value that the meter cannot tell any more) of the connection may be between point A and point B.

[vinceroger69]

Re: Philips 40PFL3008T stopped working

sorry budm i ve got lost as in is he testing diodes or resistors?

[budm]

Re: Philips 40PFL3008T stopped working

I wonder if it is his typo.

[Acerman123]

Re: Philips 40PFL3008T stopped working

Sorry my bad, I meant diode! So then one of them is faulty.

Edit: I attached picture but in the pic the faulty one is not lifted, it's the one next to it.

[vinceroger69]

Re: Philips 40PFL3008T stopped working

if its removed from the board and your testing it in diode mode and it beeps both ways then yes its bad im not sure if budm has any ideas what may of caused that part to blow? and maybe some other parts to check before you fit a new one.

[electro_nico]

Re: Philips 40PFL3008T stopped working

In case the fuse fs101 is opened, it is necessary to verify and / or to replace the following positions:-D112 to the D115 (RL207)-D100 (RL207)-Q301 (10N60C)-D525 (zéner diode 18Vsmd)-D512 and D513 (BA159)-C305 (47mf/50v)
This is a very tipic problem in this chassis ( Vestel 17ips20)

[electro_nico]

Re: Philips 40PFL3008T stopped working

In case the fuse fs101 is opened, it is necessary to verify and / or to replace the following positions:-D112 to the D115 (RL207)-D100 (RL207)-Q301 (10N60C)-D525 (zéner diode 18Vsmd)-D512 and D513 (BA159)-C305 (47mf/50v)
This is a very tipic problem in this chassis ( Vestel 17ips20)

The motive of the breakdown is the defective thermal contact between the transistor q301 and his cooler

[ReeceyBurger123]

Re: Philips 40PFL3008T stopped working

the motive of the breakdown is the defective thermal contact between the transistor q301 and his cooler

+1

[Acerman123]

Re: Philips 40PFL3008T stopped working

I have the board 17ips20p and it may be slightly different? If I understood correctly I have fuse in different place. I also measured those diodes on the lower left portion of the board and they are fine, it seems that all diodes except that one is good. Also on the upper left part there is apparently the component which may overheat, but atleast in this board it seems to have plenty of thermal paste?

I have attached pics. Corrections and additional info is appreciated I ordered 10 pack of that one diode model since they don't cost that much, if there is something else wrong the diode probably breaks again immediately?

[vinceroger69]

Re: Philips 40PFL3008T stopped working

maybe apply some new compound to stop the q301 overheating etc also before you fit the new diode check these parts mentioned in the above post a it may be the cause of that diode going short circuit
it is necessary to verify and / or to replace the following positions:-D112 to the D115 (RL207)-D100 (RL207)-Q301 (10N60C)-D525 (zéner diode 18Vsmd)-D512 and D513 (BA159)-C305 (47mf/50v)

[ReeceyBurger123]

Re: Philips 40PFL3008T stopped working

If you have a shorted output diode replace it......

[Acerman123]

Re: Philips 40PFL3008T stopped working

Thanks everyone for your patience and support.

I replaced that one diode and now the TV seems to be working! I watched some TV, I just did the replacing so long term tests have not been done. I will need to do better soldering job also, I can't remember where I bought the tin (maybe eBay) but seems like it doesn't want to melt properly.

I ordered SB5100 diodes but received SR5100. First I thought I shouldn't use those and instead file a dispute, but after doing some Googling they apparently should be same type, can you confirm this?

[ReeceyBurger123]

Re: Philips 40PFL3008T stopped working

Yes they are interchangeable also good work

[Acerman123]

Re: Philips 40PFL3008T stopped working

Unfortunately this repair might have resulted in failure. I watch TV rarely so it has been couple days unplugged. It worked fine the same day I replaced the diode and I recall using it the next day also, not very long perioid but after that it has been unplugged.

Now I plugged the power cord and I can't remember if it happened instantly or after I pressed a button to turn the TV on but there was audible pop and fuse was blown in my house. My brother was on the same room and he said he saw sparks on the side which has not the power supply but that connector board etc. Nothing looks burnt anywhere but the screw near SCART connector was unusually warm, not too hot to touch but still.

My repair might very well be the reason for this, but I'm also bit suspicious about the SCART connector, during the time I have used the TV I have plugged and unplugged cables on SCART port several times becaus I've had game consoles and no SCART splitter until relatively recently. One theory I have is that the SCART connector is damaged and that caused problems... but it might very well a mistake made during repair. What the mistake was and why it worked fine at first I don't know. No capacitors blown, nothing looks burnt.

[ReeceyBurger123]

Re: Philips 40PFL3008T stopped working

Ahh dam, so what voltages are coming from the Psu now ? If the Psu is dead I don't think the Mb caused it, likely the shorted output diode damaged the primary side of the Psu as it normal does with these Vestels.

[Acerman123]

Re: Philips 40PFL3008T stopped working

Because it made that audible pop I really don't know if I should continue trying to fix this TV, but I removed the PSU and nothing looks burnt. I did mention earlier that while TV worked I knew I did poor soldering job which I would need to fix. Well I didn't and now when I look the new diode is wiggling so whether or not that caused the problem it's definetely not good and infact even poorer soldering than I thought...

Since nothing is burnt on the board part of me still says I should proceed testing and maybe plugging this to the wall after fixing the soldering, the other part of me says I should just buy a new TV

[ReeceyBurger123]

Re: Philips 40PFL3008T stopped working

Have you tested the mains ac fuse on the Psu ?

[Acerman123]

Re: Philips 40PFL3008T stopped working

Yes I quickly measured that it should be good.

But I think I have now made the final mistake, I tried to remove the new diode and clear all old solder mess. Well, in this process I tore off both solder pads from the board, [f-bomb].

This repair quickly fell from being epic success to be epic fail !

[ReeceyBurger123]

Re: Philips 40PFL3008T stopped working

Ahh dam maybe just replace the Psu then ?