Re: Insignia NS L42Q 10A
Thanks for the fast reply!
If i am understanding correctly I need to replace the AS15-HF with another exposed pad part -HF or -HG.
If I find the part would you recommend a heat gun for removal - possibly cut all the leads first?
The part removal maybe somewhat difficult but I know what to expect now. I am sure I would have damaged the board not knowing about the exposed pad part.
Now I am more worried about installing the part than removing it.
Thank You for the Part data and exposed pad part info.
1simtime
Member
Last Activity: 10-18-2019, 06:54 PM
Joined: 02-26-2011
Location: Minnesota
-
Re: Insignia NS L42Q 10A
The QFP on my T-Con board is marked AS15-HF. What does the -HF mean?
Can I replace it with any AS15-__ ? Are there AS15-__ with bad -__ or date codes to stay away from?
I plan to order 1 from Ebay, just not sure which -__ to get.
I have read thru many posts but I did not find these answers.
Thanks for the inputLeave a comment:
-
Re: Dynex DX-LCD32-09 Sound but no Picture
Here is a picture of F1, (if it turned out) it is marked 20 and package size is 1206.
So, did replacing F1 fix it or did it open up again? Can anyone direct me to a replacement from DIGI KEY. Mine has the same issues and F1 is open.
Thanks...Leave a comment:
-
Re: Insignia NS-LCD19 no picture but has back light and sound
I have information on Q1 marked NAH3.
.
I will try to locate data sheets for D1 marked DNcLeave a comment:
-
Re: Insignia NS-LCD19 no picture but has back light and sound
If you think BCX70H will replace the NAH3, I found it at Digikey.
Here are the resistance readings for D1 I took before Q4 smoked.
looking at pic 3973 I used top left as pin 1 and went clockwise to 6
I used na for readings that changed .
+1 to -2=na........-3=na.......-4=na.....-5=na......-6=na
+2 to -1=.823M...-3=na.......-4=na.....-5=na......-6=na
+3 to -1=pulsed...-2=open....-4=na.....-5=na.....-6=na
+4 to -1=pulsed...-2=pulsed..-3=287K..-5=na.....-6=na
...Leave a comment:
-
Re: Insignia NS-LCD19 no picture but has back light and sound
Removed C34 good and C35 good.Still had 2.2 Ohms on board.
Removed Q4 (lower right leg where 2.2 ohm was came off) part was already heat damaged . Measured 27 Ohms on lower left.
2.2 ohms gone on board. So looks like Q4 is bad.Leave a comment:
-
Re: Insignia NS-LCD19 no picture but has back light and sound
Timed out so I could not add to last post
Removed R67 short is gone at C1.
C34, C35 still 2.2 Ohms.
Q4 top leg to bottom left =15 Ohms
Q4Top to bottom right(goes to GND) =2.2 Ohms
Readings keep changing for all below
C20 .821M /280K Ohm
C23 314K Ohm
D3 - to anode , + to cathode = 172 Ohm
D3 + to anode , - to cathode = 119 Ohm
D2 - "........ " , + " ........." = 483K
D2 + "........ " , - " ...........Leave a comment:
-
Re: Insignia NS-LCD19 no picture but has back light and sound
Removed R67 short is gone at C1.
C34, C35 still 2.2 Ohms.
Q4 top leg to bottom left =15 Ohms
Q4Top to bottom right(goes to GND) =2.2 OhmsLeave a comment:
-
Re: Insignia NS-LCD19 no picture but has back light and sound
Replaced C29=9.4uF V? and C30=9.3uF V? and screen flashed and Q4 smoked.
I checked for shorts and solder balls before I powered up so I don't know why Q4 went. Q4 is marked NAH3.
Q4 =top-bottom left=2.2 Ohm/top-bottom right =short
U1 1-2=2.2 Ohm
C35,C33,C3,C1,C2=2.2 OhmLeave a comment:
-
Re: Insignia NS-LCD19 no picture but has back light and sound
I updated the picture with voltages (hope they show up)
I removed C29=10.4uF,30=6.36uF,31=10.9uF and 32=10.9uF.
I will try to find replacement for C30 and reinstall all 4...Leave a comment:
-
Re: Insignia NS-LCD19 no picture but has back light and sound
I didn't give up ,just limited on time.I used a different meter because the lcd display is hard to read on my 24 year old DMM.
ALL ON T-CON BOARD
Caps measure from 55K-500K Ohms (in circuit).
voltage at fuse =4.96V--C29,30,31,32 =4.56V--U1 pin 1=0V, 2=4.94V, 3=2.49V
U6 pin 1=.18V, 2=.076V, 3=4.949V, 4=.24V, 5=.85V, 6=.35V, 7,8=0V
C27=1V , C24=3.56V , C20,23=4.94V , C25=3.52V , C34,35=4.94V
C17=2.79V , C4=2.49V
D3 anode= 4.94V ,cathode =4.56V
R122,R119,R116,R121,R55...Leave a comment:
-
Re: Insignia NS-LCD19 no picture but has back light and sound
U5 is marked " U1 D
ATO 8A"
M.B. U903 pin 1=1.24V pin2=2.49v pin3=4.18v
T-Con U1 pin1=0V pin2=4.11V pin3=2.49v
ALL MY READINGS ARE USING CHASSIS GROUND to the pins!(even my other posts also)
Should I be using different gnd ?...Last edited by 1simtime; 04-02-2011, 04:15 PM.Leave a comment:
-
Re: Insignia NS-LCD19 no picture but has back light and sound
Great video ! Thanks
I got 4.1V from gnd. to the fuse on the T-con.
After seeing my pictures, appears C30 is damaged.(not sure if I did it,cause I did not see it last night)I do not know the value of C30 .Any ideas on replacement? I think all 4 caps may be the same value I will have to remove them and check.
Also not sure what was on U5 but I cleaned it off. Looked like silver paint.
I may have just cracked the coating on C30. In pic. 3,4 top of the 4 caps in parallel 4.3V....Leave a comment:
-
Re: Insignia NS-LCD19 no picture but has back light and sound
I guess I did not look close enough last time .I found the T-con board! I didn't have much time to check it out . Visual looks good ,fuse good,o ohm res. good . I am open to ideas....
Leave a comment:
-
Re: Insignia NS-LCD19 no picture but has back light and sound
I have already removed the P.S. , M.B. and mounting plate .I saw the back of the panel but no t-con board. I also checked all the cables .The cable goes from the M.B. to the panel.The twisted multi-colored cable goes to the buttons and the other larger black cable goes to the panelLast edited by 1simtime; 03-31-2011, 08:04 PM.Leave a comment:
-
Re: Insignia NS-LCD19 no picture but has back light and sound
I used the coax for tv and yel/rd/wt rca for input 1 . I did not try hdmi or pc input.
Also the menu does not pop up ,but when I press the button I see a very faint shadow of the outline of the menu box.Leave a comment:
-
Re: Akai LCT3285TA LCD TV power supply issues
The resistor I removed appears to be Black/Yellow/White/? can't read (Looks like it got hot) measures 95K.
I was told that R68 is 68K 1/2 watt .I guess I will try that .
I also found Q11 bad in case anyone else was having the same problem.Leave a comment:
-
Insignia NS-LCD19 no picture but has back light and sound
When plugged in the amber LED flashes 8 times (pattern changes every time I plug it in). I have 5V and 12V.
When powered, LED turns green, after approx. 15 sec. the back light comes on and screen is white/grey. I have 5V ,12V,3V on/off and 3V dim. so P.S. seems to be working.
Buttons appear to work,I have sound and can hear when channels change. When I change inputs to AV1 I have sound.
When powered down LED flashes amber (random patterns) back light shuts off and LED is solid amber.
No parts appear bad or damaged, checked for bad solder... -
Re: ESR meter - recommendations?
Anyone know the differences between the 3 ESR meters ?
I am most interested in the ESR micro 4 and the atlas ESR70+Leave a comment:
-
Re: Vizio VX32L turns on with backlight, no video or sound
I got a picture!
I replaced U33,U7,U9 voltages were low for all three on the board -off the board only U33 appears bad. I had to remove some caps to get to U33,U7,U9. They did not unsolder very well! Must be GND planes. I removed 5 100uF 16V( measured 71uF-79uF) and 3 220uF 25V (Measured 191uF -199Uf).I wonder how many other caps are out of tolerance or bad ESR ( I still don't have ESR meter).I replaced the 8 caps.
Have not fully tested all functions yet but I have to turn the volume up to 50 + to hear it...Leave a comment:
No activity results to display
Leave a comment: