RCA 42pA30RQ no picture

[hienton2]

I have this tv RCA 42PA30RQ.Tv has red led turn to green when on., But It has no picture.Power relay click and click couple times.Remove power connector to these Y and X board. No more click and click but power is on.

Look at Y and X board on the side of tv I found 3 IBGT RJP30E2 shorted On Y board.And 2 IBGT RJH30E2 shorted on X board.
My question : If I order these expensive Mosfets and replace will fix the tv.Buffer board looks ok.Any body know what cause these Mosfets shorted?

Thanks

[hienton2]

Re: RCA 42pA30RQ no picture

I do not see any crack on screen.with power connector unplug from y and X board. I see
Va and Vs reachs 200v and 60v then goes down to zero.any idea please.

[tom66]

Re: RCA 42pA30RQ no picture

The FETs fail due to poor design by Samsung. Inadequate heat sinking.
To test buffer:
https://www.youtube.com/watch?v=51SZsfH60EY

[hienton2]

Re: RCA 42pA30RQ no picture

Thanks Tom66. I aready order the Fets .8 dollars a piece. Hope they will fix tv.

[tom66]

Re: RCA 42pA30RQ no picture

You do realise both boards cost less than $40?

You may want to test buffer as I indicated. Also, the FET drivers may need to be tested. This is why I usually just swap these boards not just the FETs. I see the FETs on eBay for $2~$3 each.

Remember to use new thermal paste.

[hienton2]

Re: RCA 42pA30RQ no picture

~2 ~3 eur or dollars? Show me one seller has that cheap on Ebay Please
Not from HongKong China

[tom66]

Re: RCA 42pA30RQ no picture

Oh I saw $8 each but it's $0.80? That's a damn good price. Where'd you get them from? Those were mostly China at $2~$3.

[hienton2]

Re: RCA 42pA30RQ no picture

http://www.ebay.com/itm/3pcs-RJH30E2...-/120886916895

[tom66]

Re: RCA 42pA30RQ no picture

So $8 each...
Just checked the prices, you guys get shafted in the US... in the UK the boards for the PS42B450 (same panel as 42PA30RQ) are £15~£20 each.

[hienton2]

Re: RCA 42pA30RQ no picture

I like to buy some plasma stuff from England but a bit too far same as Hong Kong. I do want to wait too long( Merchandies must pass custome gate). Nice to know you.

[tom66]

Re: RCA 42pA30RQ no picture

Where do you live? Thought this model was US only. Maybe I'm wrong.

[hienton2]

Re: RCA 42pA30RQ no picture

You are right . USA

[tw2005]

Re: RCA 42pA30RQ no picture

SJ has heaps of parts, ymains $23, Xmains $29, Y buffer $32 or a complete all boards kit $124 42PA30RQ-K1 S42AX-YB09 panel


http://www.shopjimmy.com/catalogsear...lt/?q=42PA30RQ

Result RJP30E2 (Equivalent Transistors)

Struct Pc Uce Ucesat Ueg Ic Tj Tr Cc Caps
1. RJP30E2DPP-M0 N-Channel 360V 1.7V 35A 150 TO220FL
2. RJP30E3DPP-M0 N-Channel 360V 1.6V 40A 150 TO220FL
3. RJP60D0DPP-M0 N-Channel 600V 1.6V 45A 70 TO220FL
4. RJP63F3DPP-M0 N-Channel 630V 1.7V 40A 100 TO220FL

[hienton2]

Re: RCA 42pA30RQ no picture

I replace the Mosfets on Y and x Sustain board . Add more heatsink to be sure .
TV work ok.

[tom66]

Re: RCA 42pA30RQ no picture

Glad to hear.