Re: Toshiba L50-B-245 GPU power issue
Thank you. I've checked other rails and I haven't found any issue. I measured on coils and when the laptop is powered off I get 3.3V and 5V. When I turn it on, I also get 1.35V (RAM), 1.05V (CPU) and 1.7V (I don't know what that's for). There is also one coil for battery which has 16.5V when battery is plugged and 2V otherwise. The only coil which doesn't have voltage is the one for GPU. So don't think any power rail is missing, except for GPU.
m5b4
Member
Last Activity: 01-05-2018, 07:08 PM
Joined: 10-15-2016
Location: Prague
-
Re: Toshiba L50-B-245 GPU power issue
I've been playing with it more and here are the results. The previous tests have been done without battery. Now I tried to put the battery back in and found out that it's much easier to turn the laptop on, probably like once in 10 tries. But still no picture on the laptop screen and also on the hdmi port. With the battery plugged in I also sometimes get five flashes of the power button led.
I was also thinking about the zero voltage issue. Could it be a normal behavior? The laptop has an integrated GPU in CPU (Core i5 5200U), so...Leave a comment:
-
Re: Toshiba L50-B-245 GPU power issue
It's 33.5 ohms.Leave a comment:
-
Toshiba L50-B-245 GPU power issue
Hi,
I have a nonworking laptop Toshiba L50-B-245 with motherboard DABLIDMB8E0 REV E. When I plug in a charger, I get a charging light. When I press the power button, the power light blinks once and I also get a short fan spin. Sometimes both lights blink. I tried to search for short on the board, but I couldn't find any.
After many tries I managed to turn the laptop on, but I didn't get anything on screen. So I did some measurements and I found out that the GPU has no voltage. The GPU VRM is controlled by ISL62771 chip. This chip has an enable pin, which should be... -
Re: Asus P5B
I haven't tried putting the e6400 back, but I tried putting those ram to another PC (with Gigabyte GA-965P-DS3P also modded with E5430). I set them to 800MHz with auto timings, which were set correctly to 6-6-6-18 with tRFC 51 and run memtest without errors. Then I manually set the timings to 5-6-6-15 with tRFC 42 and the board didn't POSTed. So now I'm pretty sure that it's indeed problem with RAM not liking those timings. I just need to find a way to set the timings correctly. I was thinking about trying older BIOS versions.Leave a comment:
-
Re: Asus P5B
I already tried that, I set the voltage to 2.0V. It didn't make any difference....Leave a comment:
-
Re: Asus P5B
I haven't tried it yet, but I'm going to try it.
I don't really care too much about memory bandwidth. I just want to have a stable system which I can't get with timings the motherboard sets....Leave a comment:
-
Re: Asus P5B
So I made some more tests. Originally I had 3 sticks of some crappy 2GB RAM. I took them out and replaced them with 2 sticks of 2GB Kingston branded RAM with heatspreaders I had in another system. Then I set them to 667Mhz and run 1 pass of memtest without errors. Then I set them to 833MHz, and let the memtest run for 1 pass, also without errors.
But the problem is with timings. The motherboard always sets it to 5-6-6-15 with tRFC 42 no matter what when the settings is left on auto. I don't know where it gets these values as it's not from SPD. The...Last edited by m5b4; 10-25-2016, 05:49 PM.Leave a comment:
-
Re: Asus P5B
I've replaced the caps and put a Xeon E5430 in. But I couldn't get it boot even on stock frequency, but could boot with FSB 266. After some experiments, I found out that the problem is with RAM.
But first I will give you some background about this PC. I got this PC from a friend for a very cheap price about 2 years ago. It was with Core 2 Duo E6400 and 1GB RAM. After I got it I bought 3 pieces of cheapest modules of 2GB 800MHz RAM (costing me more than the PC itself) on aukro (Czech equivalent of ebay), put it in and it was running fine until now when...Leave a comment:
-
Re: Asus P5B
I'm probably overlooking something, but I don't see how it confirms the positions. When looking at the pictures, that board is indeed similar, but the cap positions are different, there are less positions on that board.Leave a comment:
-
Re: Asus P5B
Thank you. I'll send you a PM with details.Leave a comment:
-
Re: Asus P5B
I don't have any higher-capacity polymers. So I will probably buy 560uF polymers from you for the vrm output, filling the one unpopulated spot. Then I'll use yours KZH 1000uF 16V for vrm input, also filling the one unpopulated spot. And about the TK caps, I will replace the one near the southbridge with my FP cap and leave the rest. Do you think it would be OK like this?
If so, how much would you want for the 10 560uF polymers and 5 KZH 1000/16?Leave a comment:
-
Re: Asus P5B
OK, but what would you recommend?
Would you also have a polymer replacement for the TK cap near the southbridge as mockingbird suggest? Do you think that I should replace all the TK caps?...Leave a comment:
-
Re: Asus P5B
I'd like to thank everyone for help.
I've decided to replace all the TMV and KZG caps, because they are on the cpu vrm. But I'm not sure about replacing TK ATWY, they all look OK. Do you think that it would increase stability when overclocking?
Should I also replace the KZG with polymers?
I've also remembered I have one broken board lying around. I've checked and found that there are some polymers there that I could reuse. There are ten caps around socket, which I think are 820uF 2.5V, but they are in 6.3x8mm form factor....Leave a comment:
-
Re: Asus P5B
So I took the board out to take more pictures and make a list of all caps.
4x KZG 1000uF 16V
9x TMV 680uF 4V
8x FJ 1500uF 6.3V
11x TK ATWY 820uF 6.3V
1x KY 470uF 6.3V
10x KMG 100uF 16V
2x HD(M) 330uF 6.3V
1x M 6363U 680uF 6.3V
1x FJS 470uF 16V
Only TVM are leaking, all of the others seems OK. Which of them should I replace?...Leave a comment:
-
Re: Asus P5B
OK, I will take the board out again to see what other caps are there.
The original caps aren't polymer, but electrolytic caps, but I would like to replace them with polymer. From what I was able to find, the X-CON caps are made by Samxon, which should be a good brand. But I couldn't find datasheet for the original TMV caps to compare the specs....Leave a comment:
-
Re: Asus P5B
I don't know if I understand it correctly. Are you suggesting replacing all chemicon caps? I thought that they were a good brand.
Do you think that X-CON ULR aren't decent? What would you suggest?...Leave a comment:
-
Re: Asus P5B
Thank you for your answer. These are all the photos I took. I haven't taken a photo of the whole board, so I found one on google. The bad caps are the 9 caps around cpu. I can't take more photos right now, because I already assembled the computer back.
It's quite strange that the computer is running fine, I wouldn't have noticed the caps, if I hadn't disassembled it for the mod. I know that it's probably not a good idea to let it run like this much longer, so I would like to replace the caps as soon as possible.
So the 560uF caps should be...Last edited by m5b4; 10-15-2016, 09:38 AM.Leave a comment:
-
Asus P5B
Hi,
I was doing the 771 mod on one of my computers (with Asus P5B) and when I took the heatsink off, I found the caps around the socket to be leaking. They are TMV 4V 680uF, which, I guess, are used on vrm output. I will need to replace them, but I haven't been able to find the datasheet for them.
I would like to replace them polymer, because I think are better and more durable. But when searching for polymers locally, I found them really hard to get in the Czech Republic. I managed to find a place that has X-CON ULR, which seem like quality caps (at least from I... -
Re: New Members - please post your introductions here
Hi, I'm Michal from the Czech Republic. I love computers and electronics in general. I'm here to get more information on my repair jobs. It's always nice when I manage to get some broken stuff to work again. But sometimes I need a little help with that.Leave a comment:
No activity results to display
Leave a comment: